Circle Resin Calculator – Calculate Resin for Round Molds
Calculate the exact amount of epoxy resin for any circular mold. Enter the diameter and depth, select a mixing ratio, and get precise resin and hardener amounts. Perfect for coasters, clock faces, round trays, and circular resin art.
Circle Resin Calculator
V = π × r² × D
Visual Output
How to Measure a Circle Mold for Resin
Follow these steps to get accurate measurements for your round mold.
Measure the Diameter
Place a ruler across the widest point of your round mold. Measure from one inside edge to the opposite inside edge.
Measure the Depth
Measure from the bottom of the mold to the desired fill level. For coasters, 0.5–1 cm. For deeper castings, 2–4 cm.
Enter Values & Calculate
Enter the diameter and depth in the calculator above, choose your mixing ratio, and hit "Calculate." The formula V = π × r² × D gives you exact resin and hardener amounts.
Common Circle Resin Projects
Round Coasters
10 cm coaster at 0.5 cm = ~39 ml. Set of 4: prepare ~172 ml (including 10% waste).
Clock Faces
30 cm clock at 0.5 cm = ~353 ml. Add dried flowers or gears before the resin sets.
Round Serving Trays
40 cm tray at 1 cm = ~1,257 ml. Use deep-pour resin for layers thicker than 6 mm.
Resin Calculator for Shapes
Volume formulas and resin calculations for every common mold shape.
Circle Resin Calculator
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.
Cylinder Resin Calculator
V = π × r² × H
Enter the diameter and height of your cylindrical mold. The formula calculates the volume for pillar molds, candle molds, vases, and pen holders.
Hollow Cylinder Resin Calculator
V = π × (R² − r²) × H
Enter the outer diameter, inner diameter, and height. Calculates resin for the wall only. Perfect for bangles, rings, and tube castings.
Rectangle Resin Calculator
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.
Square Resin Calculator
V = S² × D
Measure one side and the depth. Since all sides are equal, the formula simplifies to side² × depth. Square coasters, tiles, and trivets use this.
Oval Resin Calculator
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.
Hexagon Resin Calculator
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.
Heart Shape Resin Calculator
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.
Circle Resin Calculator FAQ
Common questions about calculating resin for round and circular molds.
Measure the diameter and depth of your circular mold. The formula is V = π × (diameter ÷ 2)² × depth. Enter these values into the circle resin calculator above for instant results in ml, grams, or ounces.
You need two measurements: the diameter (the distance across the circle) and the depth (how thick you want the resin pour). Measure the inside of the mold for the most accurate calculation.
For a 10 cm diameter coaster at 0.5 cm depth: V = π × 5² × 0.5 ≈ 39 ml of mixed resin. Add 10% for waste, so prepare about 43 ml total.
Yes. Clock face molds are circular. Measure the inner diameter and depth of the mold, then use this calculator. A typical 30 cm clock face at 0.5 cm deep needs about 353 ml of resin.
The formula is V = π × r² × D, where r is the radius (half the diameter) and D is the depth. One cubic centimeter equals one milliliter, so the result is directly in ml.
Place a ruler across the widest point of the mold, measuring from one inside edge to the opposite inside edge. This is the diameter. Divide by 2 to get the radius used in the formula.