Hollow Cylinder Resin Calculator – Calculate Resin for Tube & Ring Molds
Calculate the exact amount of epoxy resin for hollow cylindrical molds like bangles, rings, tubes, and pipe castings. Enter outer diameter, inner diameter, and height to get only the resin volume you actually need.
Hollow Cylinder Resin Calculator
V = π × (R² − r²) × H
Visual Output
How to Measure a Hollow Cylinder Mold
Three measurements are all you need for an accurate hollow cylinder calculation.
Measure Outer Diameter
Measure across the widest point of the mold from one outside edge to the other.
Measure Inner Diameter
Measure the diameter of the hollow center. The difference between outer and inner determines wall thickness.
Measure Height & Calculate
Measure the height, enter all three values in the calculator above, and get your exact resin amount.
Common Hollow Cylinder Resin Projects
Resin Bangles
Standard bangle mold (7 cm outer, 6 cm inner, 2 cm) = ~20 ml. Add flowers, glitter, or gold flakes.
Ring Blanks
A single ring blank typically needs 1–3 ml. Work with small, precise measurements.
Decorative Tubes
Napkin rings, lamp rings, and decorative tubes. Measure outer and inner diameters carefully.
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.
Hollow Cylinder Resin Calculator FAQ
Common questions about calculating resin for bangle, ring, and tube molds.
Measure the outer diameter, inner diameter, and height. The formula is V = π × (R² − r²) × H, where R is the outer radius and r is the inner radius.
A hollow cylinder is a tube-shaped mold with an empty center — like a bangle mold, ring mold, or pipe casting. You only fill the space between the outer and inner walls.
A typical bangle (7 cm outer, 6 cm inner, 2 cm wide): V = π × (3.5² − 3²) × 2 ≈ 20.4 ml per bangle.
Measure the outer diameter (widest point across the outside), the inner diameter (the hole in the center), and the height (width of the bangle).
Yes. Fill the mold with water, pour into a measuring cup, and read the ml. This is the most accurate method for complex shapes.
Resin bangles, ring blanks, napkin rings, pipe sections, lamp shade rings, and cylindrical pen blanks with hollow cores.