Epoxy volume & weight converter

How much does epoxy weigh?

Weight is volume × density. Mixed epoxy is typically somewhere around 1.05–1.2 g/ml (a specific gravity of 1.05–1.2), so a US gallon weighs roughly 8.8–10 lb and a liter roughly 1.05–1.2 kg. Filled products — with mineral fillers or metallic pigments — can be heavier. The default of 1.1 gives about 9.2 lb per gallon; the worked example on how much a gallon of epoxy weighs runs through the range and a real data-sheet figure.

weight = volume × specific gravity × density of water
1 US gal of water ≈ 8.345 lb → 1 gal at SG 1.1 ≈ 9.18 lb
1 L at SG 1.1 = 1.1 kg
1 gal = 231 cu in = 128 fl oz = 3.785 L

When you need weight instead of volume

• Forms and handling: a 3-gallon river table pour is roughly 26–30 lb of liquid, and that weight sits on your form and tape.
• Weighing batches on a scale: convert the volume a calculator gives you into grams for accurate small batches. Resin and hardener usually differ in density, so split the batch with the epoxy mix ratio calculator — for example 1:1 epoxy by weight in grams.
• Furniture weight: a thick epoxy tabletop adds a lot more than the wood alone; it matters for legs, bases and moving it.
• Kits sold by weight: some products list contents in pounds or kilograms. Convert to volume before comparing coverage.

Cubic inches to gallons

If you’ve measured a space in inches, you’ve got cubic inches. A US gallon is exactly 231 cubic inches (NIST Handbook 44), so divide by 231 for gallons, or by 1.805 for fluid ounces. Pick Cubic inches or cm³ → weight above to go straight from a box measurement to pounds of resin; in metric, 1 cm³ is 1 ml.