# Epoxy Calculator

URL: https://speedycalculator.com/calculators/construction/epoxy/
Last updated: 2026-10-25

> The epoxy calculator works out how much epoxy resin you need for a river table, countertop, floor coating or pour, by volume and weight, and how many kits to buy.

## Inputs

- Shape
- Length (or diameter) (ft, m, in, yd, cm)
- Width (ft, m, in, yd, cm)
- Thickness (in, cm, mm, ft, m, mm)
- Quantity
- Waste (%)
- Mixed density (kg/m³, lb/ft³, g/cm³, lb/yd³)
- Kit size
- Price per kit (/piece)

## Results

- Epoxy volume
- Weight
- Kits
- Cost

## Formula

```
Volume = area × thickness × quantity × (1 + waste)
Weight = volume × resin density (≈ 1.1 g/cm³)
Kits = ceil(volume ÷ kit volume)
```

## Explanation

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

FieldWhat to enterShapeChoose one: Rectangle, Circle (length = diameter)Length (or diameter)Units: ft, m, in, yd, cmWidthUnits: ft, m, in, yd, cmThicknessUnits: in, cm, mm, ft, m, mmQuantityA numberWasteIn %Mixed densityUnits: kg/m³, lb/ft³, g/cm³, lb/yd³Kit sizeChoose one: 1 quart, 1 gallon, 1.5 gallon, 2 gallon …Price per kitUnits: /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)0.06250.7710.09381.1570.1251.5430.15631.9290.18752.3140.253.086

## 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.

## FAQ

**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).