This free resin calculator tells you the precise amount of epoxy resin and hardener for any mold, canvas, or DIY project. Enter length, width, and depth, select a mixing ratio (1:1, 2:1, or 3:1), and get instant results in milliliters, grams, liters, or ounces. No guesswork, no wasted resin.
Follow these steps to calculate the right amount of epoxy resin and hardener for your project.
Select rectangle, circle, or "known volume" if you already know the cubic centimeters or cubic inches of your mold. The resin calculator adjusts its input fields based on your choice.
Measure your mold's inside dimensions with a ruler or tape. Enter length, width, and depth (thickness) in centimeters or inches. For circles, measure the diameter. Accuracy here determines the accuracy of your resin calculation.
Select the mixing ratio from your resin's label — most products use 1:1 or 2:1 by volume. Hit "Calculate Volume." The resin calculator gives you the exact milliliters of resin and hardener to mix.
The resin calculator computes the total volume of epoxy resin your project requires, then splits it into Part A (resin) and Part B (hardener) based on your mixing ratio.
Enter your mold dimensions in centimeters or inches. Pick a mixing ratio — 1:1, 2:1, 3:1, or 4:1 by volume. Hit "Calculate Volume" and the visual beaker diagram updates in real time.
This tool handles coating resin (thin pours of 3–6 mm) and casting resin (deep pours of 2–4 cm). Whether you're making resin art, casting jewelry, or coating a river table, the resin calculator gives you accurate numbers.
Calculate the exact amount of epoxy resin by volume or by weight for any project size.
This online resin calculator runs in your browser — no downloads, no sign-up. Enter your mold dimensions, and the tool calculates how much epoxy resin and hardener you need. It works on phones, tablets, and desktops.
Volume-based calculation is the standard for most epoxy resin products. The formula is simple: Length × Width × Depth = Total Volume (in cubic centimeters, which equals milliliters). Then divide by your mixing ratio to get Part A and Part B amounts.
Some resin brands specify mixing ratios by weight instead of volume. Epoxy resin has a density of approximately 1.1 g/ml. To convert: multiply your volume in ml by 1.1 to get grams. Use the output unit selector in the resin calculator to switch between ml, grams, liters, and ounces.
Understand mixing ratios and calculate how much hardener to add to your epoxy resin.
A 1:1 ratio means equal parts resin and hardener by volume. If you need 200 ml total, pour 100 ml of resin and 100 ml of hardener. This is the most common ratio for resin art, coatings, and tumblers.
A 2:1 ratio uses two parts resin for one part hardener. For 300 ml total: 200 ml resin, 100 ml hardener. Deep-pour casting resins commonly use a 2:1 mixing ratio because the slower cure prevents overheating.
A 3:1 ratio means three parts resin to one part hardener. For 400 ml total: 300 ml resin, 100 ml hardener. This ratio appears in some industrial and specialty epoxy systems.
The mixing ratio determines the chemical reaction between resin and hardener. An incorrect ratio causes incomplete curing — your piece stays tacky, soft, or cloudy. Always follow the ratio on your product's label. The resin calculator handles the math for you once you pick the ratio.
The amount of hardener depends on both the total volume and the mixing ratio. Formula: Hardener = Total Volume ÷ (Ratio A + Ratio B) × Ratio B. For a 2:1 ratio with 600 ml total: 600 ÷ 3 × 1 = 200 ml hardener, 400 ml resin.
Equal parts — most common for resin art and coatings.
Calculate pour volume, convert between units, and understand the resin volume formulas.
Pour volume is the total amount of mixed resin you pour into your mold. For a rectangular mold: Volume = Length × Width × Depth. A 30 cm × 20 cm × 1 cm tray needs 600 ml of mixed resin. Add 10% for waste — overmixing, cups, and stir sticks absorb some.
This epoxy resin volume calculator handles standard shapes — rectangles, circles, and custom volumes. For circles: Volume = π × radius² × depth. A 10 cm diameter coaster at 0.5 cm thick needs about 39 ml.
Rectangle: L × W × D = ml. Circle: π × (diameter ÷ 2)² × D = ml. One cubic centimeter equals one milliliter. To convert cubic inches to ml, multiply by 16.387.
Epoxy resin weighs roughly 1.1 grams per milliliter. To convert: ml × 1.1 = grams. To convert ml to ounces: ml ÷ 29.5735 = oz. To convert ml to liters: ml ÷ 1000 = liters. The resin calculator output selector handles all these conversions.
Estimate how much epoxy resin covers your surface area at a given depth.
One liter of epoxy resin covers approximately 1 square meter at 1 mm depth. For a 2 mm coating: 2 liters per square meter. This rule of thumb works for flat surfaces like tabletops, bar tops, and artwork coatings.
Use the coverage estimator on the right to enter your surface dimensions and coating depth. The tool calculates total surface area, resin needed, and the amount with a 10% waste factor. Waste accounts for mixing cups, stir sticks, and accidental spills during the pour.
For resin art and canvas coatings, a depth of 1.5 mm to 3 mm is typical. For countertop coatings, 2 mm to 3 mm gives a durable, glossy finish. Flood-coat depths above 6 mm need casting resin instead of coating resin to avoid overheating during the curing time.
Volume formulas and resin calculations for every common mold shape.
V = π × r² × D
Enter the diameter and depth. The resin calculator multiplies π × radius² × depth to get the volume in ml. Coasters, clock faces, and round trays use this formula.
V = π × a × b × D
An oval uses π × semi-major axis × semi-minor axis × depth. Measure the longest and shortest diameters, divide each by 2, and multiply with π and depth.
V = L × W × D
The simplest formula. Length × width × depth in centimeters gives you the volume in milliliters. Trays, tabletops, and mold frames are rectangular.
V = (3√3 / 2) × s² × D
Measure the side length of the hexagon. The area is (3√3 / 2) × side². Multiply by depth for the volume in cubic centimeters. Hexagon coasters and tiles use this formula.
V ≈ known mold volume
Heart molds are irregular. Fill your mold with water, measure the water in ml, then enter that as "known volume" in the resin calculator. This gives you the exact amount of epoxy resin needed.
Resin amounts for the most popular DIY projects and resin casting applications.
Silicone molds come in every shape. Measure inside dimensions or fill with water to find the volume. The resin calculator handles both methods — enter dimensions or type the known volume in ml.
Most PopularCanvas resin art uses a thin coating — typically 1.5 mm to 3 mm. For a 40 × 50 cm canvas at 2 mm: 400 ml of mixed resin. Add 10% waste factor for a total of 440 ml.
ArtRiver tables need deep-pour casting resin. A typical river channel is 150 × 30 cm × 4 cm deep = 18,000 ml (18 liters). Pour in layers of 2–4 cm and let each layer reach its pot life before the next.
Large ProjectMeasure the table diameter. For a 60 cm round table with a 3 mm resin coating: π × 30² × 0.3 = 848 ml. The resin calculator does this automatically when you select the circle shape.
FurnitureKeychain molds are small — typically 5 × 3 × 0.8 cm. That's only 12 ml of mixed resin per keychain. Mix a small batch and pour carefully. Batch production? Multiply by the number of molds.
Small CraftConvert resin measurements between milliliters, grams, liters, and ounces.
Milliliters are the default unit for resin calculations. 1 cubic centimeter = 1 ml. Most resin products list their mixing ratios and package sizes in ml.
To convert ml to grams: ml × 1.1 = grams (using epoxy resin density of 1.1 g/ml). 500 ml of resin weighs approximately 550 grams. Some brands specify ratios by weight — use this conversion.
Liters are useful for large projects like river tables and countertops. 1 liter = 1,000 ml. A 150 × 30 × 4 cm river table channel needs 18 liters of mixed epoxy resin.
To convert ml to fluid ounces: ml ÷ 29.5735 = oz. A 500 ml batch is about 16.9 oz. Many US resin brands label their products in ounces.
The math behind every resin calculation — formulas, steps, and examples.
Rectangle: Volume = Length × Width × Depth. Circle: Volume = π × (Diameter ÷ 2)² × Depth. Both produce results in cubic centimeters, which equal milliliters. These are the two formulas this resin calculator uses internally.
Step 1: Calculate the total volume of your mold using the formula above. Step 2: Pick your mixing ratio (e.g., 2:1). Step 3: Divide the total by the sum of parts (2 + 1 = 3). Step 4: Multiply each part. For 600 ml at 2:1: Resin = 600 × (2/3) = 400 ml. Hardener = 600 × (1/3) = 200 ml.
For irregular molds (hearts, alphabets, custom shapes): fill the mold with water, pour the water into a graduated cup, and read the volume. Enter that number as "known volume" in the resin calculator. This method works for every mold shape, including curves and undercuts.
Quick-reference table showing typical resin amounts for common DIY projects.
| Project | Typical Size | Depth | Approx. Resin (ml) |
|---|---|---|---|
| Coaster (circle) | 10 cm dia | 0.5 cm | ~39 ml |
| Serving Tray | 30 × 20 cm | 1 cm | ~600 ml |
| Canvas Coat | 40 × 50 cm | 2 mm | ~400 ml |
| River Table Channel | 150 × 30 cm | 4 cm | ~18,000 ml |
| Round Table Coat | 60 cm dia | 3 mm | ~848 ml |
| Keychain Mold | 5 × 3 cm | 0.8 cm | ~12 ml |
| Alphabet Mold (each) | ~4 × 3 cm | 1 cm | ~8–12 ml |
Common questions about epoxy resin calculations, mixing ratios, curing time, and the resin calculator.
A resin calculator computes how much epoxy resin and hardener you need based on your mold dimensions and mixing ratio. It saves time and prevents waste.
Measure length, width, and depth in centimeters, multiply them together to get the volume in milliliters. For a 30 × 30 × 1 cm tray, you need 900 ml of mixed resin.
Use Volume = L × W × D for rectangles or Volume = π × r² × D for circles, then split by your mixing ratio to get resin and hardener amounts.
Follow your product label. For a 1:1 ratio, use equal parts. For a 2:1 ratio, use half as much hardener as resin. Accurate measurement is critical.
Mix slowly for at least 3 minutes. Scrape the sides and bottom of your mixing cup to make sure all resin and hardener are fully combined.
Standard coating resin: 3–6 mm per layer. Deep-pour casting resin: 2–4 cm per layer. Check your product's maximum pour depth.
Yes. Fully cured epoxy resin is waterproof. Most take 24–72 hours to fully cure, depending on temperature and thickness.
Sticky resin means incomplete curing. Common causes: wrong mixing ratio, not enough mixing time, cold workspace, or expired product.