How Much Is 1 Inch of Water When Watering The Gardening

Рет қаралды 213,165

10 жыл бұрын

Everyone always says that 1 inch of water per week is the right amount of water that a garden should be getting. But how do you know what 1 inch of water looks like? Here is how!
Cubic Inches to gallon converter - www.asknumbers.com/CubicInchTo...
Gallon to Liter converter - www.gallonstoliters.com/
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Пікірлер: 247

@fairehawke906 3 жыл бұрын

I can not tell you how long I've been searching for a simple way to calculate that darn 'one inch water' guideline and you've answered my question with the simplest online calculator I've ever found. Thank You so much, MIgardener

@SakuraiKunLikes 7 жыл бұрын

Basically in the video he said to water 0.6 gallons or around 9 cups of water each square foot of patch.

@Serendipityonyoutube 5 жыл бұрын

A week right?

@Ronelbey 5 жыл бұрын

Is 0.6 gallon is what you water at one time a week ? Can you slit it up twice a week at 0.3?

@mooshmobile 5 жыл бұрын

@@Serendipityonyoutube correct

@mooshmobile 5 жыл бұрын

@@Ronelbey Yes it would be advisable to split it up. If you were watering twice a week it would be 4.5 cups each time. The older your plants get the longer they can go without more frequent waterings. I water mine more frequently when they are young and have a shallower root system. Some plants require a little more water, some a little less. Peppers for example like to dry out a little. Similarly tomatoes taste better when they are allowed to dry out a bit too. so complex.

@Osckarre 3 жыл бұрын

I thought he said "6 gallons"! I had to go back and listen more closely. Totally threw me off thanks for clearing that up.

@buddiebudd547 7 жыл бұрын

can you just water my garden for me, its kinda confusing:(

@morrisrandy 4 жыл бұрын

You're the living version of IKEA instructions....

@ittybittyknits334 4 жыл бұрын

that's funny!

@kellypywtorak5166 4 жыл бұрын

😂😂😂🤪

@zxc06095 3 жыл бұрын

I like Luke and buy seeds from him, but your line about Ikea instructions is just so funny! I haven't laughed this much in weeks. I can't wait to share this. Thanks for the lift!

@GoneToTheSnowDogs 10 жыл бұрын

Hello there fellow Michigan KZfaqr!! So glad you joined the group and we found you!!! #Pawsome channel!!! I can't wait to see more!

@bryanl1977 2 жыл бұрын

Finally someone explains what the notorious one inch per week actually means. Thank you! I've installed a drip tape system with emitters that emit .25 gallons per hour and there is essentially an emitter every square foot in my raised beds, so run it for 3 hours and it's about the one inch per week. Hard to imagine that it's that simple. My drip system is on top of woven fabric and it seems to be running off a lot before it soaks through, so I'll probably start with 3 times per week and cut it back from there. Next year, watering system under the fabric. Thanks again!

@kellyriddell5014 4 жыл бұрын

Thank you SO MUCH for this. Just having some kind of concrete idea of how much water to give them helps. I've been able to find how many inches of water each type of plant I'm growing likes, so knowing it's per square foot is enormously helpful in figuring out how much to give!

@richardyeboah4904 Жыл бұрын

You have over simplified this mystery for me, thanks man

@BrunoAguirre 3 жыл бұрын

Hey Luke, thank you for the great explanation. You were very successful on making such a complex topic very accessible. Greeting from Brazil!

@wildiris229 2 жыл бұрын

Bless you sir. I had to mess with a calculator but this was still so straight forward and helpful compared to so many other videos. You didnt say any extraneous stuff. (As you can imagine, when your plants are struggling and youre new to gardening, this kind of information is important to have quick yet it takes hours to find an article or videos that just tells you what to do for now while you figure it out so youre not completely in the dark. Thank you so much.

@heavymechanic2 10 жыл бұрын

Two weeks ago I did the calculations and its comparable to your results of 5/8 US-Gal per square foot of growing space. Where I live, we depend upon rainfall for growing. To maintain plant vigor and productivity, I am watering 1/2 inch per week on a 3-5 day cycle to maintain good soil moisture, deep watering is better than a little every day. My plants are mulched to conserve water and I use a moisture meter to know when to water the garden before the plants droop.

@judymiller323 Жыл бұрын

so just a little more than 1/2 gal.... thanks

@AshWP 3 жыл бұрын

I can’t thank you enough for this video! I was going crazy with the “water 1 inch per week” info on website with no other info on calculations! Thank you!!!

@trosanelli 10 жыл бұрын

Great Video! With my 4' X 4' square foot garden beds, I calculated that one inch of water is a little less than 10 gallons per week. I'll water each bed about 3 gallons of water every other day.

@AYWalton 6 жыл бұрын

That is all I needed to know---without all of the math.

@simontiong6320 4 жыл бұрын

Thank you so much. Ive been searching about how much volume of water is needed for the each plant to grow better. And this vid is so helpful. Now I can provide some datas in my thesis. :)

@10yearvet 10 жыл бұрын

Good info, Luke. Seems like I'm doing just about right. though since I've found a good source of mulch I find I don't have to use as much water nor as often.

@cathyfowler6631 Жыл бұрын

Thank you so much for simplifying that important aspect of gardening!

@antea9055 4 жыл бұрын

2.5 water cans of 10 liters, per square meter per week. Personally I use more or less depending on factors; sun, plant sizes, soil (draining sandy or retaining muddy/humusy). Good rule of thumb though. Always dig and feel soil moisture before watering to eventually become a master waterer!

@belindamostert1125 7 жыл бұрын

Fabulous !! Thanx so much, this really helped this beginner gardener !

@Thornlessrose39 4 жыл бұрын

Thank you for your informative video.You have helped me and my garden very ,much!

@PinkChucky15 10 жыл бұрын

Thanks for the info, I'm definitely one of those people who don't usually know how much to water hehe :-)

@triciasklodowske5653 4 жыл бұрын

I use a cleaned out tuna fish/cat food can and give each tomato, pepper, zucchini and all squash plant's one can of water per day ( we have very sandy soil) when it's really hot then they get 2 can's. All others I water with the hose, one bed at a time. Thank's as always for the video/info. Stay safe and healthy. God bless

@Ajitzone 6 жыл бұрын

Thank you for the video. I am doing a project on irrigation. This video helped me alot :)

@dt65262 10 жыл бұрын

My raised beds are 4' x 8' converted to inches is 48" x 96" = 4608 square inches converted to gallons is 19.9 gallons I'd say I've been under watering. Luckily we've had lots of rain this June and I haven't had to water yet. Water here is cheap only 2.75 per 1,000 gallons :) I can water 50 raised beds for $2.75. No reason not to water. Thanks for the info!

@tomqryan 8 жыл бұрын

How do you water? Do you use a nozzle, wand, sprinkler, or just the hose end? Please make a video showing how you water 1-inch in the first bed and in the second with wall to wall plants. Thanks. I enjoy your videos:)

@louisestanzione5170 7 жыл бұрын

Can't wait for your video on shade cloth since I live in Florida and the HEAT is on!! I have tomatoes -eggplant- pole Asian long beans -and okra in garden. I'm worried about tomatoes - seeds I got from you. They germinated beautiful and started fruiting immediately- unbelievable!! Anyways I want them to go well right now I have pvc pipe in hoops and draped black screening over to keep heat down. But shade cloth probably would be better? Don't know. I saw a video on a unit made with pvc pipe with connecters and the shade cloth attached to that. That looked like a nice way plus cost effective and portable. Please don't wait too long to talk about ok? Thanks!! Love your videos !

@honeybacres 10 жыл бұрын

Great video Luke. This should help some people be more efficient with their watering :)

@susanbechtold3629 Жыл бұрын

Thank you for providing the conversion link. Very helpful!

@joannestretch 9 жыл бұрын

tks this is gr8 for the garden, would you happen to have advice on containers? I also have some produce in containers, do u take the depth of the container into consideration or just measure the top, and if its a round container (like most are) is that different from a square container?

@OneYardRevolution 10 жыл бұрын

Great tips, Luke. Nature has been over-watering our garden for the last several weeks. ;-) We've only had to water once or twice this year. Have you been getting a lot of rain too?

@joefristoe4777 Жыл бұрын

Good stuff! All too many times we receive the requirements to maintain a healthy garden with no explanation of how to apply it. Thank-you!

@shawhit3462 10 жыл бұрын

Good to know. Thanks, that answered a lot of questions.

@jimmyb127 8 жыл бұрын

best explanation ive heard great work!

@mortishaallagebordo7970 10 жыл бұрын

So could you do a how to video on setting up our drip systems for watering this one inch you have spoken about.

@hugoramirez1786 5 жыл бұрын

You made it unnecessarily complicated. It's not needed to get *exact* numbers and conversions that are difficult to understand (how much is 0.6 gallons, anyway?). Just say that half a gallon per square foot, per week (much better if applied one quart every three days) is a good start. Some plants (radishes, for example), about 12 plants per square foot, will share that 1 gallon easily; Other plants that are heavy drinkers (tomatoes) will ocuppy TWO square feet per plant, and could be better served taking one gallon every three days. They also need some sort of fertilizing, water alone will not produce good tomatoes. Don't get too technical with quantities, because other factors, like sun exposure, heat, the quality of the soil, availability (or lack of) fertilizer etc, will throw your numbers off real quick.

@laman6647 4 жыл бұрын

Thank you. More helpful than the video.

@Kyota_Izuma 4 жыл бұрын

I only got half way through the video cause the explanation wasn't near as comprehensive as your explanation. Thank you for posting!

@Sansash01202 3 жыл бұрын

Was going to ask if someone could nutshell this video it's way to complicated, in fact I was more confused after watching it than i'd been just guessing an inch of water .. Thanks for your comment ..clarity at last.

@mucholangs 8 ай бұрын

*Just say that half a gallon per square foot, per week* Nothing wrong with knowing how the gallon was calculated. I don't find it complicated at all. What if I want to build a software calculator for the conversion? Using 1/2 gallon would be wrong.

@CaliKim29 10 жыл бұрын

Excellent info, Luke! I am one of those people who has always wondered how to figure out how much is one inch of water in the garden. Thx for the help!

@heavymechanic2 10 жыл бұрын

A good rule of thumb is 1-1/2 to 2 square feet of garden space per gallon of water , this is adequate for most garden plants. It gives you about an inch of water.

@MysteryMan159 6 жыл бұрын

I’m amazed that that’s per WEEK. I grow mine in pots so I had been watering them about 1/2 to a 1/4 inch per day. (My Watermelons twice a day)

@LindaPenney 10 жыл бұрын

Awesome update have a blessed day

@barbarathomas3633 6 жыл бұрын

Great info here. My tomatoes and peppers are planted in rows 3-4 ft apart. Would each plant be considered 1 sq ft and therefore need approximately .6 gallons weekly?

@ColeyElizabeth9 2 жыл бұрын

Thank you, I am new at gardening. 🌸🌱🌻

@christopherguiliano4104 Жыл бұрын

Thanks migardener! That was a great lesson.

@wendiland 10 жыл бұрын

It's amazing what water can do for life, especially in the life of plants. Makes a huge difference between one that's watered more than the other. Is 1 inch water apply to So Cal? We are practically in a desert! It sure takes a lot of water for gardens here to be lush.

@MIgardener 10 жыл бұрын

yep, 1 inch applies to everywhere. Just spread the 1 inch out throughout the week.

@Osckarre 3 жыл бұрын

Great info! Thanks for sharing.

@andyjessica1749 4 жыл бұрын

Do all plants in pot have 1 square foot area? or how do you measure the area? Do you base on the overall of how big the plant is?

@travelingmntngal7963 6 жыл бұрын

How do you water, then, to account for the correct amount of water? Jygs, sprinkler, ect? And how would you account for any rain??

@annettefournier9655 6 жыл бұрын

It seems that when I water my plants do worse. Could it be the chlorinated tap water? Especially the summer squash, cucumbers, winter squash and lettuce seem to hate it and a few leaves will yellow and get brown edges. The nightshades are ok with it and spinach and bulb and root crops. The squashes and cuces recover alright after a natural rain.

@vf2874 3 жыл бұрын

This was super helpful for me!

@nicolelink2419 4 жыл бұрын

Maybe I’m too new didn’t understand it at all.

@jcproject6408 8 жыл бұрын

I am watering my garden using a hose. Is it advisable or not, because I won't be able to measure the amount of water I'm giving the plants.

@aaronogara8091 2 жыл бұрын

This is great, thank you!

@colleenstinton-czuprynski9894 3 жыл бұрын

Thanks. That was helpful.

@RonanMurphy08 8 жыл бұрын

Very helpful. Thanks!

@MIgardener 8 жыл бұрын

Glad it was able to help!

@Sandra-nx3pl 6 жыл бұрын

is the same way for zone 10 ..is very hot now 7/1/18..realy i can do the same way or just get same space more because the mathematic on the desert same times do not work like we like to be..! thank you Luke i always like your videos.

@Inggrisonlineofficial 3 жыл бұрын

Super helpful tips.

@haltersweb Жыл бұрын

Unsure if this will work but I happen to have a 1’x1’ chafing dish. I’m going to count how many seconds it takes my hose to fill it up 1”. Then I will count out those seconds while I water 1 sq ft around each plant. Hoping it works.

@deb3834 5 жыл бұрын

if you know how many gallons you need. try timing the fill of a 5 gallon container. 1 min. 2 min.etc. then water your bed for the time period needed for the area. 5 gallons, 1 min. need 30 gal. then each bed gets 6 min. of water. Does that work?

@jamesdgarcia 4 жыл бұрын

Is 1” per week spread out across 7 days? Honest question as it’s my first time growing.

@helenawilliams2603 2 жыл бұрын

Thank you soooo much. Now, let's talk about calculating how much to fertilize your plants according to how much you plant.

@marynoose1024 2 жыл бұрын

I love your videos!! My question is how do I get rid of fungus in my strawberry beds?

@ICanCraftThat1 6 жыл бұрын

How do I know when I have put that many gallons in? Is there a hose attachment to tell me?

@gginnj 10 жыл бұрын

I use the following method: 1st convert your area to centimeters (because cubic centimeters is equivalent to milliliters) - a 4' x 8' garden would be 4x12x3.54 and 8x12x3.54 (feet->inches->cm). then multiply those two numbers, and take that and multiple by 3.54 (1 inch depth of water). The reason is that 1cc is equivalent - now take the final number (now in ml) divide by 3800 (3.8 liters = 1 gallon) should give you the # gallons in 1" of water for 4' x 8' - OOOOR you could use the easy peasy conversion shown above in the video.

@boomster57 2 жыл бұрын

It's 2.54 cm per inch not 3.54

@gginnj 2 жыл бұрын

@@boomster57 yeah - fat finger syndrome

@MissTrixie29 3 жыл бұрын

Well, I am happy to announce that I have been overwatering my plants. Sometimes I'll give my my grown tomato plants a gallon twice a week. I fill up the watering can from the rain barrel and walk back and forth and back and forth. Jeez, my poor back is going to be happy this summer!

@davidnichols1943 3 жыл бұрын

Thank you. That helped.

@MichaelSHartman 5 жыл бұрын

2.5 pints per square foot. Or 1.27 liters per square decimeter. Start saving the water ran to warm the shower & dish water, water from cooking, and washing hands.

@alexisfelice 3 жыл бұрын

Excellent tips!! Didn't think of that.

@kntslayer3039 5 ай бұрын

what a life saver 🙏🏽

@christinaboo5379 4 жыл бұрын

This video left more confused then I started

@Metztli0 3 жыл бұрын

Lmao! I feel the same. 😂

@Osckarre 3 жыл бұрын

Basically a volume of 12" x 12" x 1" is about 0.6 gallons, or just over half a gallon of water. There is a formula so just use the calculator he shared in the links.

@jordellaskincare6843 2 жыл бұрын

Me too. Maybe show what one inch of water actually looks like, or water for a certain time, that 1" would be..

@gottgaame 2 жыл бұрын

1 inch of water is one hour

@sherimatthews2958 2 жыл бұрын

Where’s the calculator???

@thomasashe2681 Жыл бұрын

Would it be 1 inch per week all on the same day or take that 1 inch and spread it out in smaller waterings throughout the week?

@trendingdailybuzzz 7 жыл бұрын

This is still hard to understand for me...what if I'm using a 5 gallon bucket with my potato plant how much water does it need and I water once or twice per day I live in the caribbean

@colincanhelp 2 жыл бұрын

Great info!

@raydio7069 8 жыл бұрын

Clear as mud! (Ha! Ha!)

@weskulturey 2 жыл бұрын

I assume this method doesn't work for pots? I measured i needed 0.76 liters (0.167 gallon) of water for a 17cm (6.7 inches) diameter pot, seems a bit much. I have no clue. Think i'll have to experiment and see if i can get something on paper along the way what works for me. There's just so many variables that need to be accounted for.

@rodusmc01 6 жыл бұрын

Your the man Luke

@ladytorres8323 4 жыл бұрын

Thank you ! 👍

@Panhorst 4 жыл бұрын

I'm new to gardening and I don't understand what's wrong with using the water hose from the house?

@LearnToGrow1 10 жыл бұрын

Great tips and info! Thanks Luke!

@RLSgardener 10 жыл бұрын

Good Tips! I just use the finger rule. I stick my finger in the dirt. It should be moist. I also have been using soaker hoses 1/2 hour everyday at 730AM. Well thats if it hasnt rained in a while. Garden has more than enough water will all the rain. I highly recommend using mulch. I used hay this year and it help a ton with weeds and moisture. It was also much cheaper than using hardwood mulch. if your watering your lawn you can place a pan out where you want to water and time how long it takes your sprinkler to fill it to 1" that's how long you need to water.

@Serendipityonyoutube 5 жыл бұрын

Nice

@Nimbleful 3 жыл бұрын

It's all about working out the volume. You need 1 inch height of water, over an area of 1 foot by 1 foot. So the volume of water you need, for 1 square foot is: 1 inch height x 12 inches width x 12 inches length = 144 inches cubed of water in volume (Remember, 1 foot = 12 inches) Volume can be measured in various units: 144 inches cubed is equivalent to: 2359 cm cubed 2.3 liters 0.6 gallons 4.2 pints 10 cups

@SunniDae333 2 жыл бұрын

Thank you!

@karine1035 4 жыл бұрын

THANK YOU My tomato plants are wilting and I wondering if I was under or over watering them but everywhere I look says to give my plants an inch of water and I couldn't figure out what they meant! I'm now realizing I have been WAY under watering them so I will be giving them a good soak tonight!

@mint_tans 4 жыл бұрын

If the leaves are curling upwards, you’re over watering.

@karine1035 4 жыл бұрын

I had some bumps show up on the stem of one of them after a too generous watering so I'm giving it a few days break to dry and breathe. Does 3-4 days without water seem reasonable after overwatering? I repoted one of them today to a much bigger pot and the soil was mostly dry (I haven't watered them for the last 48h) but I want to be sure they had time to bounce back because I water them again. They're flowering so I think they're doing pretty well despite that mistake

@raisingheartsforheaven 6 жыл бұрын

So do you walk around each bed with a watering can filled to the exact right amount for each plant and then go back and fill it up for the next plant? Isn't that time consuming? What do you do if you are watering via a hose?

@ballsdeep9648 6 жыл бұрын

Roslyn Williams you could probably turn your hose on at the pressure/ flow rate that you usually use to water your plants. Then aim it into a one gallon container and count how long that takes to fill up. Then you know about how many seconds it takes to spray one gallon. Soon you should get an idea/ feel for it and not have to count. Just a thought...

@raisingheartsforheaven 6 жыл бұрын

Great idea. Thanks.

@421jrs 4 жыл бұрын

Thank you!

@Poppies__ 3 жыл бұрын

Does this apply to plants in pots?

@eyesoftheworld91 2 жыл бұрын

“Hey guys, all you have to do is a ton of complicated math and that’s one inch of water for your plants.” Any questions? LOL. This video brought me joy though.

@moseyonover733 2 жыл бұрын

.... you think calculating volume is complicated math.

@richardlong2412 10 жыл бұрын

have you ever used duck poop on your garden? Does it need to be composted before you use it on the garden. I know you can use rabbit poop directly.

@Dessthemess 4 жыл бұрын

THANK YOU

@josephku4184 9 жыл бұрын

This was EXTREMELY helpful

@MIgardener 9 жыл бұрын

Joseph Ku Thank you!!! I am so glad you liked it.

@uriel-heavensguardian8949 8 ай бұрын

Ok so I’ll be growing strawberries in a 7 gallon grow pot. Soo what you’re saying is find out it’s deep it is and then water till it’s full to 1 to 2inches of water?!? Soo I need to plug the drain holes?

@floopjack152 3 жыл бұрын

Awesome!!

@SurfinScientist 6 жыл бұрын

Fortunately, when using the metric system no converter is needed once you remember that 1 inch equals 2.54 centimeter (cm). So, 144 cubic inch equals 144 x 2.54 x 2.54 x 2.54 cubic cm, which is approximately 2400 cubic cm, and that gives you 2.4 liters. That's how easy it is!

@robertpoole6397 4 жыл бұрын

okay, so if I'm running a drip irrigation system that is rated at 10 GPH on a bed that 80 sq. ft. (8x10 bed). So, I should be using 48 gallons (80 sg. ft. x .06) per week. 48 gallons /7 days= 7 gallons per day. If I run my drip irrigation 1 hour per day, I would be overwatering by 3 gallons per day. That would waste alot of water.

@ladyjavandab7181 10 жыл бұрын

How would you caculate one inch of water if plants are in 5 gal. And 3 gal. Containers.? I think I'm under watering my plants. I'm getting deformed fruit as well as stu ted growth.

@RebelMafia2.0 10 жыл бұрын

Javandab Rhunt same thing here if it were cups I'd get it???

@MIgardener 10 жыл бұрын

find the radius (distance from center to the edge) THEN here is your equasion. Radius X Radius X 3.12

@ladyjavandab7181 10 жыл бұрын

So if cal. Correctly would be...6*6*3.12=112.32, but what does the total mean?

@ladyjavandab7181 10 жыл бұрын

Oh so at least 3 gal of water for a 5 gal container plant? Did I do that right?

@MIgardener 10 жыл бұрын

Javandab Rhunt no, 1 gallon per week.

@nokomismn9685 7 жыл бұрын

I heard you can set an empty tuna can next to a plant and spray the plant until there is an inch of water in the can. Will this work? Needless to say, I'm no master gardener. ;-) My healthiest plants are my native plants (milkweed, cup plant, sweet black-eyed susan, goldenrod) THAT I DO NOT WATER AT ALL....I wonder if chlorine and other chemicals in tap water are affecting some of the plants I water that have a pale appearance.

@huertorriquenocaribbeanbac4157 2 жыл бұрын

Leave the water out for 24 hrs to dechlorinate naturally :)

@dodat2120 6 жыл бұрын

This guy should be a rocket scientist

@cliver8881 6 жыл бұрын

How many times did you say "one inch of wodder" ?

@peopleslayer12333 Жыл бұрын

So two squar feet of volume would be 288 cubic inches? since 1 foot of volume would be 144?

@micahsleopard 8 жыл бұрын

What about if you are growing in pots? How do you measure that?

@MIgardener 8 жыл бұрын

+micahsleopard The diameter of the pot in inches multiplied by 2, then multiplied by 1 inch.

@UwU_the_UwUer 3 жыл бұрын

thank you so much. literally no website i could find actually explained this at all.

@gunsofaugust1971 4 жыл бұрын

This guy is knowledgable and covers a lot of good topics. IMO he could have a much more successful channel if he edited down A LOT. His standard videos run 12/13 minutes; they could easily be 4. This one could have been 2. He should watch his videos and prune them down. Hate to be "the guy in a rush", but I am not. I have a long attention span, but I am busy and superfluous commentary turns me off. Give me the info and let me move on. Now that I have looked this gift horse in the mouth, thanks for the videos. Keep it up.

@adlap0152 7 жыл бұрын

This method rests squarely on the type of plant in your garden. Say for example you are growing a crop of wheat or tea. These crops thrive on more water than say the black eyed pea, making this over complicated if you were to mix the two. All I do is water thoroughly and mist. Hasn't failed me yet.

@CherylsWorld.63 2 жыл бұрын

I didn't understand a single thing, it started to sound complicated so I got frustrated. I've waited my entire life to have a garden but 2 years straight everything's yellow and dying, Ive read plants can turn yellow from over and under watering though and don't know which I'm doing (my kale has bugs everywhere, my tomatoes have bumps on the stems and the tomatoes never look normal). I wish I had 1 real life gardening friend to show me but how long to hold the hose over a plant would be helpful.

@mariequinn9962 3 жыл бұрын

Love this video. Would love to know the formula if I didn’t have a calculator. 12x12=144 (x~?) = .6

@Nimbleful 3 жыл бұрын

It's about working out the volume: If you're looking at an area of 12 inches by 12 inches, then the volume you need is: 12x12x1 = 144 inches cubed (that "1" is the 1 inch of water that will sit on top of the 12x12 inch area) 144 inches cubed can then be converted to other volume amounts. Just type into google "144 inches cubed into gallons" and it'll give you the gallon amount you need. The formula would be: "Volume of water you need in inches cubed (V) = Length of container in inches (L) x Width of container in inches (W) x Height of water in inches (H)" ie V = L x W x H (H height is always equal to 1 inch because in the recommendation is that we need to water 1 inch height of water per week) That will give you the amount you need in inches cubed. Then convert that to gallons (or liters or cups etc) by asking google to do the conversion for you.