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Rectangular or Circular Coating Volume

Estimate geometric mixed-coating volume from a rectangular or circular surface and a uniform entered thickness.

  • Formula & worked example
  • Private in your browser
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

A 50 cm by 20 cm surface with a 2 mm layer has volume 200 mL before absorption or waste. The thickness is a geometry input, not a product recommendation.

Rectangle volume = length × width × thickness; circular volume = π × diameter² × thickness ÷ 4

Worked example

Enter these known values and leave the other values blank.

Rectangle length
50 cm
Rectangle width
20 cm
Entered uniform coating thickness
2 mm
Rectangle geometric coating volume
200 mL

Assumptions and limitations

  • The surface is a flat rectangle or circle and the layer has uniform positive thickness. Dimensions are positive.
  • The result is total geometric coating volume; it does not split resin and hardener, convert between their masses, or account for cure behavior.
  • Absorption, spills, edge runoff, voids and waste are separate from the geometric result.
  • The entered thickness is not a recommendation about a product’s allowable pour depth.

Common questions

Is the result the resin component alone?

No. It represents the total geometric coating volume. Split components only according to your product’s mixing instructions.

Can I solve for thickness?

Yes. Enter the surface dimensions and the corresponding volume to recover uniform geometric thickness.

References

The US fluid ounce uses one 128th of the exact US liquid gallon, replacing the rounded captured reciprocal factor. Bookify replaces the captured rounded US gallon with the exact 3.785411784-liter definition.

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