How much resin do I need? – How much resin to mix?

How much resin do I need

How much resin should I mix for a project?

When it comes to making things with resin, one of the tricky parts is knowing how much mixed resin you’re going to need. It’s important to make sure you have enough, but of course, you don’t want to waste any when making your resin jewelry, crafts and paintings. If you find yourself asking ‘How much resin do I need?’, here are a few tips and formulas to help you figure out how much resin you’re going to need to mix for a project.

Option 1:

If you are working with something with ‘sides’, like a mold or bezel, the most straightforward way to figure out the amount of resin you’re going to need is to pour water into the item, then measure that volume of water.

A few key measurements are:

*1 milliliter (mL) equals 1 cc (cubic centimeter)
*1 teaspoon equals 5 mL
*1 ounce equals 30 mL
*1 cubic inch equals 16.3871 milliliters

Know that you are not going to catch every drop of water as it comes out of your mold or bezel, so you may want to mix a little more resin to account for this.

Make sure your item are dry first before pouring in the resin.

Option 2:

For the times when you want to be more exact, or if you are trying to calculate the amount of resin to go on a flat surface like a painting, you can take measurements of the area and figure out the volume of resin needed by multiplying the length times width times height.

Here’s an example: A mold cavity is 1 inch square by 1/2 inch deep.

1 inch x 1 inch x 1/2 inch equals 0.5 cubic inches.  Since 1 cubic inch equals 16.3871 milliliters (from option 1), this mold cavity will hold approximately 8.189355 mL (the math is 16.3871 x .5). I would just round up to 9 mL from here.

Or, because math is hard you can use this free resin calculator



This article explains more for calculating the amount of resin to cover a painting.

Option 3:

What do you do if you are casting resin into a cylinder or sphere?

We’re are getting deep into the math now.  🙂  Cylinder volume equals Pi (3.14) x radius2 x height.  Sphere volume equals 4/3 x Pi (3.14) x radius3

Note:  Radius is the distance halfway across.  Diameter is the distance all the way across.  To get radius, you will need to divide the diameter by 2.  Don’t even ask me where that Pi number came from.

Don’t forget, if you’re only casting a half sphere (like mold 429) or half cylinder (like mold 443), divide your volume by two.

resin bangle mold 414

Here’s an example I use quite frequently. I’m going to make a casting with this chunky bangle bracelet mold. Here are the dimensions: 2 5/8 inches inner diameter, 5/8 inches wide, 3/4 inches tall.

Let’s get the volume of the ‘outer’ circle: 2 5/8 inches plus 5/8 inches times two (two because of each side) equals 3 7/8 inches total diameter. Using the formula above, the volume of a cylinder that size equals:

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3.14 x (3.875/2)2x .75 which equals 8.84 cubic inches.

But hold on, we need to subtract the inner cylinder, otherwise, it’s like we’re filling up the entire bracelet without a hole for your wrist.

Inner cylinder volume equals:

3.14 x (2.625/2)2x .75 which equals 4.057 cubic inches.

That means the volume of the bangle is 8.84 cubic inches minus 4.057 cubic inches which equals 4.783 cubic inches. Since 4.783 cubic inches equals 78.38 milliliters (4.783 x 16.3871), divide that number by 30 and you get approximately 2.6 ounces of resin needed for your project.

You can also use the free resin calculator to do the math for you.

You will need to do two calculations:  one for the outer dimensions, then one for the inner dimensions.  Subtract the inner results from the outer results and you know how much resin you need for your bracelet.

Other things you need to know if you are asking how much resin do I need:

1.  Resin needs a minimum amount of resin and hardener mixed together to generate enough heat to start the curing process.  Make sure after you have made your calculations that you are mixing the manufacturer’s recommended minimum mixing amount.  The flip side of that is true as well.  Make sure the amount you need doesn’t go over the manufacturer’s maximum recommended mixing amount.  If it does, you will need to divide that amount up into the appropriate number of castings so you don’t generate too much heat at once.

2.  Always err on the side of mixing a little more rather than a little less.  If you have some leftover resin, have some backup projects ready to go.  One of my favorites is turning your favorite scrapbooking papers into wearable jewelry using resin.

3.  To make sure you get accurate measurements, I always recommend using graduated cups.  We have them in the 1 ounce and 10 ounce size.

Want to learn about resin from the comfort of your home?  Get a copy of Resin Fundamentals.  It was written with the beginning artist in mind and gets you up to expert level knowledge in only a couple of hours.  Buy now and read in minutes!

Unpublished Blog Posts of Resin Obsession, LLC © 2020 Resin Obsession, LLC


50 thoughts on “How much resin do I need? – How much resin to mix?

  1. I was pouring a layer of clear cast 7050 over painted woof frames. I did give the hsrdener and resin a warm bath for about 5 minutes after coating the third one, it got like hard taffy and smoke actually stsrted to come from it. Did I give it too long of a bsth? Any help is much appreciated.

    1. Using inches then converting to ml (wrongly referred to as mL) is just ridiculous. Stick to metric and you’ll be just fine. Over complicating things with measurements in imperial because Americans refuse to use metric, even though they are taught it in school is lame.

  2. When measuring out resin and hardener I read that the cough syrup measuring cups are the best to use. Can they be reused? I literally threw away a stack of them several months ago… until I caught the “Resin jewelry bug”! I’m sure the answer is somewhere, but I have read and watched so many tutorials lately I’ve probably missed it! Thanks

  3. Hi how much resin should I mix i f I need to create a big canvas (like your videos) , the measure is 1 milliliter of resin vs 1cc of area?. thanks a lot.

  4. I want to buy a larger volume of Eli Chem’s resin. Will you be offering their Ultra Cast extended use resin in 7 liter volume?
    I live in Texas.

  5. all i need to know is how many ounces of resin / hardener do i use to do 2by2 sqare feet canvas? simple lamen terms please not math mumbo jumbo i just do not get it…

  6. I’m looking to make a diorama using a 36″ model submarine. I will be cutting the hull off below the water line so I’ll be needing approximately 42″ length by 7″ width and a depth of around 1-1.5″. I don’t want to buy way more than I need (and don’t want to run out part way through). What sort of weight would I need for this? (I’ve never used resin before). Thanks.

  7. there’s a great calculator at artresin/calculator, you just input your numbers and it tells you how much you need.

  8. Question: I’m pouring a clear ball but half comes out clear and the other half is really messed up and needs intense filing can I pour in layers and cure it to keep from getting this problem.

  9. How much resin and hardner will be use for 14ft length and 14ft breadth..after conversion to meters it’s 16sqms

    1. How deep do you want your casting? There is a calculator in the article that can do the math, but you need to know how deep you want to pour the resin.

  10. I’m about to take on my first river table. I’ve found lots of great info for calculating resin amounts but all pertain to a regular or at least semi-regular shape. Is there any way (beyond guessing) to calculate a very irregular shape?

  11. I tried using the measurement system, but didn’t understand the number that came up. It just seemed to be too much. I’m trying to make an 8×10 resin pour in a frame for my shell collection. I think an 1/8 on would be thick enough. What do you suggest?

  12. I’m doing a round table top that has a diameter (measured all the way across, right?) of 42″. How much resin do I need?!

  13. I am doing very small pieces where it’s a laser cut hole in a piece of 1/8 plywood. I have figured out the approximate area and then figured out how many per cubic inch. Next I need to figure out how many I can do before the resin stops being workable and then will do the math on how much to mix at a time. A very reverse way than most but it should work for my intended use.

  14. I’m wanting to do a floor the room is 14ft by18ft how hard would this be as I am putting down plywood and pre painting it or would I need to do each individual sheet than lay down

  15. This will be my first project and im so excited. How much resin will i need to cover 4- 4×4 ceramic tiles.
    Thank you for all your information and videos.

  16. Hello I am making a table and measure that I needed approximately 1096 oz but now how do I determine how much Resin (part A) and harder (part B) I pour?

    1. Hi Kim, your resin kit directions should tell you how to mix your resin, either by weight or by volume. For example, if the directions say to mix 1 to 1 by volume, then you will need 548 ounces of each part.

  17. I’m not sure how to use the calculator for my project. I’m doing alphabet keychains and they’re all different sizes and shapes so rectangle/square and cylinder don’t work for me. The only thing that’s consistent is the mold is 1.57in. Height. Also, my letters keep coming out curved down like it shrunk when curing. Is there a way to fix this while pouring or would the easiest way be to just add more resin on them after they’ve cured???

    1. Hi Jamie, unfortunately, trying to figure out exactly how much resin you need for the letter molds is a little tedious using the calculator. You may want to try filling a few cavities with water, then measuring the water. Average it out across the number of cavities you poured into and that will give you an idea of how much resin you need for each letter.

      As for the edge, what you are experiencing is normal. You can either sand the edges down or fill with a doming resin after during. You can buy doming resin in our store here:

  18. I use the water measure system quite often, but I do it this way.
    I take let’s see a 16oz measuring cup full with water, pour what I need over the item in question , look how much water is left in the cup and what you used is what you need in resin. I hope I made it clear enough

  19. One more conversion for us dummy Americans. Most of the people that I associate with use THE good old imperial system. 1 cubic inch = 0.55413 ounces.

  20. Hi

    Looking to cover a table top that I’ve covered with bottle tops, I’ve used the calculator and it’s saying I need 8835.73 ml of resin. Measurements are 75cm diameter 2cm depth, but surely this will be way too much when you take into account the volume that all the bottle tops will use. Would I be right thinking that half of this amount will still be more than enough?


    1. Hi Chris, the resin is going to leak underneath the bottle caps. i.e., you are going to need enough to fill the bottle caps with resin too. You can start with trying about a third of the amount, then seeing if you need to add more. The thin layer will also help you get out bubbles easier.

  21. Hello, I’m looking to make some rolling trays. What is a good resin to use? Does it need to be food safe? Thank you

  22. Hey there… I am still confused to know how will I know the exact amount of hardner and resin I should mix… according to my mold…
    Yesterday I used a resin calculator app didn’t worked so well…
    I putted my first layer and kept half of it for the second round….but after some time my left over resin was cured on the mug only😂…… And the resin I putted on the mold is still to be cured… what should I do and how should I know the exact amount of hardner and resin to use and mix… please help…I used high gloss resin for preserving my rose….

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