Project notes
Understand this estimate
A resin estimate starts with the space to fill. The result is mixed resin and hardener together; it does not tell you whether a pour depth is supported by a particular product.
How to use the calculator
Choose the shape and units
Use rectangular dimensions, a round diameter, or a measured volume for an irregular mold. Enter all measurements in the selected unit system.
Inputs Project shape · Measurement units
Measure the cavity
Measure inside dimensions and the intended fill depth. For an irregular mold, measure displaced volume instead of guessing from its outline.
Inputs Length · Width · Diameter · Pour depth · Measured volume
Set an optional allowance
Use zero unless you have a project-specific reason to add a margin. The allowance changes quantity only; it does not change safe thickness.
Inputs Extra allowance
Formula and variables
Rectangle: length × width × depth. Circle: π × (diameter ÷ 2)² × depth. 1 US gallon = 231 cubic inches. Extra allowance multiplies volume by 1 + allowance ÷ 100.
- L × W × DRectangular cavity dimensions
- Inside length, width and fill depth.in or cm
- πr²DRound cavity volume
- Radius is half the entered diameter.in³ or cm³
- 231 in³US gallon conversion
- Used for the US-volume output.in³/US gal
What the result means
Result interpretation
The gallon and fluid-ounce values are mixed material estimates after any entered allowance. Metric volume is a conversion of the same estimate. Confirm maximum pour depth, batch size and cure instructions on the current product label.
Limits and assumptions
Volume is mixed resin plus hardener. It does not establish safe pour depth, working time or cure time. Check the product label and account for sealed versus porous wood.
Worked example
Rectangular tabletop channel
Assumptions
- The cavity is a true rectangle measured inside the form.
- No extra allowance is added.
Calculation
- 24 × 48 × 0.125 = 144 in³.
- 144 ÷ 231 = 0.623376 US gal before display rounding.
| Mixed epoxy | 0.6234 US gal |
|---|---|
| Mixed volume | 79.79 US fl oz |
| Metric volume | 2.36 L |
Common questions
- Does this tell me the maximum safe pour depth?
- No. Use the depth limit and batch guidance for the exact resin product and ambient conditions.
- How do I estimate an irregular river channel?
- Measure it in smaller sections and add their volumes, or enter an independently measured mold volume.