Local onlyThe math runs in JavaScript in this tab. Your figures are remembered in this browser's local storage, and nothing is uploaded.
Mixing too little epoxy mid-pour is how you get a visible line, and mixing way too much wastes expensive resin. This works out how much to mix for a surface or a cavity, from the area and the depth, with a margin for waste and an allowance for the wood or objects the resin flows around. It handles a thin flood coat and a deep river pour the same way.
Volume is area times depth
All of this is one idea: the resin fills a space, and that space is the area times how deep you pour. A thin flood coat over a tabletop is a big area at a small depth; a river pour is a smaller channel at a much greater depth. Work out the rectangle, multiply by the depth, and you have the volume. The calculator then turns it into gallons or liters and the ounces or milliliters you actually measure.
Subtract what is not resin
A river table is not a solid block of epoxy, it is resin flowing between two slabs, so the channel might be only a third of the overall rectangle. Pour for the whole rectangle and you mix three times what you need. The area-that-is-epoxy setting is where you tell it roughly how much of the space is actually resin, so a full tabletop stays at a hundred while a narrow river drops to a third or so. Estimate it from the gap.
Always mix a little over
Running short in the middle of a pour is the one thing you cannot recover from cleanly: by the time you mix a fresh batch the first has started to set, and the join shows as a line or a ridge. So the waste margin is not really waste, it is insurance. Ten percent covers what stays in the cup and what creeps over the edge, and a bit more is wise on a big or awkward pour. Leftover resin always finds a use.
Deep pours have a ceiling
Curing epoxy makes its own heat, and the thicker the pour the more it builds, so casting resins give a maximum pour depth, often an inch or two at a time. Go past it and the mass can overheat, yellow, crack or crack the wood. This figures the total volume you need; if your depth is more than your resin allows at once, split it into layers and let each cure before the next. Check your product's limit before a deep pour.
More MakerKiln tools
- mix ratioEpoxy Mix Ratio CalculatorResin and hardener amounts for a batch, by volume or weight, with the other measure worked out.→
- board feetBoard Foot CalculatorBoard feet and cost for a whole lumber list, with a waste allowance.→
- resin volumeResin Mold CalculatorThe resin a mold needs, from its size, so you mix the right amount.→
Put this calculator on your site
Free to embed, and welcome. It runs the same way, in your visitor's browser, and it sizes itself to fit. Paste this where you want it, and it stays current on its own:
Prefer to host it yourself, offline or on an intranet? Download the file above. Keep the MakerKiln credit and it is free to use.