Can I measure epoxy by weight instead of volume?

Yes. The by-weight ratio differs from the by-volume ratio because resin and hardener have different densities. The calculator shows each part in litres and grams; on a scale, weigh to the by-weight ratio.

Jeff Mack Supply · Maker Tools

Epoxy Calculator

Measure your project, get the exact resin you need — litres, the Part A / Part B split in litres and grams, how many pours to plan, and the right kit. Built for river tables, moulds, top coats and void fills.

Measurements

Resin

Waste buffer — extra so you don't run short

Enter your measurements and the resin estimate will appear here.

How this epoxy calculator works

Deep pours are calculated by volume (length × width × depth, converted to litres); top coats by surface area × thickness. A waste buffer is added so cup residue and small measuring errors don't leave you short. Measuring on a scale uses a different ratio than measuring by volume, because the resin and hardener have different densities — if you weigh, follow the by-weight ratio shown.

How much epoxy do I need for a river table?

Measure only the river channel, not the whole slab. Enter its length, narrowest and widest width, and pour depth — the calculator averages the width and returns the litres, the Part A / Part B split, and the kit to buy.

Can I measure by weight on a scale?

Yes. Use the by-weight ratio shown; it differs from the by-volume ratio because resin and hardener have different densities.

How many pours will a deep project take?

Deep pour resin has a maximum single-pour depth. The calculator divides your depth by that limit and tells you how many lifts to plan.

An Jeff Mack Supply maker tool · Mississauga, ON

Shop all resin & epoxy →

Estimates only. Measure carefully and confirm mix ratios (by volume and by weight) and pour depths against the product's technical data sheet before mixing. Gram totals depend on the resin's density; the A : B weight ratio does not. Always plan a small buffer.