Epoxy Calculator – Resin, Hardener & Kit Counts
Use this epoxy calculator to estimate how much resin (Part A) and hardener (Part B) you need for coatings, countertops, flooring, river tables, and deep pours. Choose coating or deep pour, enter your dimensions and thickness, select a 1:1 or 2:1 mix ratio (or set a custom ratio), and add a small waste allowance for mixing losses. Results show total volume in liters and gallons, split A/B amounts, and the number of kits to order.
How It Works
Volume = area × thickness. We apply your waste allowance and then split the total mix by the selected ratio (A : B). For deep pours, the tool also suggests the number of layers based on a maximum single-pour depth to help manage heat (exotherm).
Tips for Better Results
- Coatings: 1–3 mm thickness is common for clear coats on tables and floors.
- Deep pours: Many products recommend ≤2 in (50 mm) per layer; follow your product’s datasheet.
- Temperature & cure: Warmer rooms lower viscosity and speed cure; avoid high humidity for clear finishes.
Related Coatings Calculators
Epoxy Calculator FAQs
How do I calculate how much epoxy I need?
Find your total area (or enter it directly), then multiply by the thickness (or depth) to get volume. This calculator handles the unit conversions, applies waste, and splits the total into Part A and Part B using your selected ratio.
How much epoxy do I need per square foot?
Usage depends on thickness. As a rough guide, 1/8 in thickness is about 0.13 gallons per ft² (about 1 gallon per ~8 ft²). For accurate totals, use your exact thickness and dimensions in the calculator.
How much epoxy do I need per square meter?
A helpful rule is: 1 mm thickness ≈ 1 L per m². So 2 mm ≈ 2 L per m², and 3 mm ≈ 3 L per m². This comes from volume math (1 m² × 1 mm = 0.001 m³ = 1 liter).
Is epoxy mixed by volume or by weight?
Many epoxies specify ratios by volume (like 2:1), but some specify by weight. This calculator splits totals by volume. If your product requires mixing by weight, follow the manufacturer’s weight ratio.
How deep can I pour epoxy at once for a river table?
Maximum pour depth depends on product chemistry, temperature, and batch size. Deep pours often require multiple layers to control heat (exotherm). Use the “Max pour per layer” field for planning, but always follow your product datasheet for safe pour depth.
Should I add extra epoxy for waste?
Yes—some epoxy stays in mixing cups, on tools, and in containers. A 5–10% waste allowance is common, especially for multiple batches or small pours.
Do I need multiple coats for a countertop or floor?
Many systems use multiple coats (seal coat + flood coat, or several thin coats). If you’re doing multiple coats, either run the calculator per coat and add totals, or adjust thickness to reflect the combined build.
Important Estimate Disclaimer
Results are approximate planning estimates only. Actual coverage may vary based on surface porosity, preparation methods, environmental conditions, and application technique.
Refer to our Methodology and Data Sources for additional information.
Multi-coat systems and substrate condition may increase total material usage.