Epoxy is sold by volume in kits of resin plus hardener. A ⅛-in flood coat over a 3 × 6 ft tabletop needs about 1.4 gallons, and a deep river table pour can need several gallons. Measure the cavity carefully, allow 10–15% for spills, seal coats and what stays in the mixing cups.
How to use the Epoxy Calculator
- Shape
- Length (or diameter)
- Width
- Thickness
- Quantity
- Waste
- Mixed density
- Kit size
- Price per kit
- Every result field is editable: type into Epoxy volume and Thickness plus every other field update to match.
Results update as you type, and every field accepts the units shown in its menu.
How it works
Choose the shape of the pour, enter its dimensions, thickness and quantity, waste, kit size and price. The calculator finds the volume, weight and number of kits.
Tips for an accurate estimate
- Take measurements at floor level and at the ceiling – walls and rooms are often slightly out of square.
- Use the manufacturer’s coverage, spacing and installation data when it differs from the typical values here.
- Keep a little extra of every finish material for touch-ups and repairs later.
- Check local building codes and permits before structural, electrical, plumbing or gas work.
Common mistakes to avoid
- Sizing heating or cooling equipment by area alone when insulation, windows and climate make a big difference.
- Buying too little paint, stain or flooring and ending up with mismatched batches.
- Overlooking the extra material for steps, railings, gables and trim.
Inputs explained
| Field | What to enter |
|---|---|
| Shape | Choose one: Rectangle, Circle (length = diameter) |
| Length (or diameter) | Units: ft, m, in, yd, cm |
| Width | Units: ft, m, in, yd, cm |
| Thickness | Units: in, cm, mm, ft, m, mm |
| Quantity | A number |
| Waste | In % |
| Mixed density | Units: kg/m³, lb/ft³, g/cm³, lb/yd³ |
| Kit size | Choose one: 1 quart, 1 gallon, 1.5 gallon, 2 gallon … |
| Price per kit | Units: /piece |
What each result means
- Weight = [Epoxy volume]×[Mixed density]
- Kits = ceil([Epoxy volume]÷[Kit size])
- Cost = [Kits]×[Price per kit]
Example values
How the main result changes when Thickness changes and everything else stays at the example values above:
| Thickness (in) | Epoxy volume (US gal) |
|---|---|
| 0.0625 | 0.771 |
| 0.0938 | 1.157 |
| 0.125 | 1.543 |
| 0.1563 | 1.929 |
| 0.1875 | 2.314 |
| 0.25 | 3.086 |
Formula
Volume = area × thickness × quantity × (1 + waste)Weight = volume × resin density (≈ 1.1 g/cm³)Kits = ceil(volume ÷ kit volume)Worked example
Inputs — Shape: Rectangle; Length (or diameter): 6 ft; Width: 3 ft; Thickness: 0.125 in; Quantity: 1; Waste: 10 %; Mixed density: 1,100 kg/m³; Kit size: 1 gallon; Price per kit: $90 /piece.
Results — Epoxy volume = 1.543 US gal; Weight = 14.16 lb; Kits = 2; Cost = $180.00.
Frequently asked questions
How much epoxy do I need for a table?
Area × thickness: a 3 × 6 ft top with a ⅛ in flood coat needs 1.35 gal (5.1 L) before waste.
How thick can I pour epoxy?
Coating epoxies are poured ⅛–¼ in per layer; deep-pour casting resins allow 1–2 in or more per pour.
How many square feet does a gallon of epoxy cover?
About 12.8 ft² at ⅛ in, or 100 ft² at 1/64 in seal coat.
What formula does the Epoxy Calculator use?
Volume = area × thickness × quantity × (1 + waste).