Your result
Click Calculate
Enter your values, then click Calculate result.How this calculator helps
The epoxy resin calculator estimates the liquid needed to occupy a rectangular layer. It also splits that total into resin and hardener when you supply the correct volume mixing ratio. The two calculations answer different questions: geometry establishes how much mixed material the layer holds, while the product specification establishes how its components must be proportioned. Neither calculation sets a safe pour depth or selects a product for your project. The displayed defaults are a demonstration, not a manufacturer recommendation.
How to use it
- 1
Measure the coated length and width in centimetres and the intended layer thickness in millimetres.
- 2
Read the selected resin and hardener labels together. Enter their volume ratio as resin:hardener, such as 2:1, then choose a 0–100% allowance.
- 3
Click Calculate result to submit these values. Input edits keep the previous result until the next click.
- 4
Compare the supporting outputs with the worked example and retain the input units with your result.
Formula and methodology
Mixed layer litres = length cm × width cm × thickness mm ÷ 10,000. Apply allowance, then divide total volume using the supplier resin:hardener volume ratio.
The calculator applies the displayed arithmetic to the values entered on this device. It does not silently load a local tax rate, currency conversion or commercial assumption.
Worked calculation example
A 100 × 50 cm surface with a 2 mm layer uses 1 L geometrically. With 10% extra and a hypothetical 2:1 volume ratio, order for 1.1 L mixed: 0.7333 L resin and 0.3667 L hardener.
How to interpret your result
Rectangular constant-depth geometry; user-supplied product volume ratio, not mass ratio or cure design. Compare total mixed volume with both component outputs: their sum should return the total. Keep geometric and allowance-adjusted amounts separate so a purchasing margin is not mistaken for layer thickness.
For different inputs or formulas, use Volume Calculator — Boxes, Tanks, Ponds and Tubes; Square Footage Calculator; Ratio Calculator.
Related questions this calculator covers
- epoxy resin calculator
Scenario comparison
| Scenario | What it shows |
|---|---|
| 100 × 50 cm at 2 mm, no allowance | 1 L geometric mixed volume. |
| The same layer at 4 mm | 2 L before allowance. |
| 1.1 L total at 2:1 by volume | 0.7333 L resin and 0.3667 L hardener. |
Common mistakes to avoid
- Using a weight ratio as a volume ratio.
- Entering millimetres into centimetre length fields.
- Treating purchasing volume as a permitted single batch or pour depth.
Reverse-check by multiplying layer litres by 10,000 and dividing by measured length and width; this should recover thickness in millimetres. Confirm resin and hardener volumes retain the entered ratio.
Authoritative reference. Rectangular constant-depth geometry; user-supplied product volume ratio, not mass ratio or cure design.What can affect the result?
Separate volume from weight
A litre is a volume; a kilogram is a mass. The calculator's component outputs are litres, so its ratio must be specified by volume. Do not copy a weight ratio into this field because resin and hardener can have different densities. Even products from the same manufacturer may use different ratios for different hardeners. If a technical sheet specifies only mass proportions, use its approved weighing method rather than converting these volume outputs with an assumed density. A correctly calculated amount can still cure incorrectly if the wrong ratio is used.
Geometry, voids and allowance
The layer model assumes constant thickness across the stated footprint. A river-table cavity, curved mould, porous substrate or sloping surface needs a more detailed volume takeoff. Divide a cavity into measured sections and sum their geometric amounts without counting overlapping sections twice. Masked areas and embedded objects reduce the occupied volume, whereas absorbent surfaces and container residue may require more. The allowance field increases total mixed volume while retaining the component ratio. It does not compensate for an incorrect mixing proportion or change the chemical reaction.
Thickness and batching
Doubling thickness doubles geometric volume; doubling both length and width multiplies it by four. Those relationships help check an unexpectedly large estimate. The calculated total is a purchasing quantity, not a recommendation to mix everything at once. Product instructions govern batch size, cure conditions, working time and allowed pour thickness. Record the actual product, hardener and technical-sheet version beside your estimate. A supplier may sell separate containers whose combined nominal volumes do not equal the amount usable at the specified ratio. Check both component quantities before buying.
Precision and project records
Measure dimensions on the prepared surface rather than an early sketch. For an uneven layer, run low- and high-thickness cases to show how uncertain the volume is. Keep the unrounded total for comparison, then use the supplier's available pack sizes for purchasing. Decimal display precision does not make a hand-measured surface exact. Document each section, its dimensions, thickness and allowance so another person can reproduce the takeoff. The formula estimates volume only; it does not certify adhesion, food contact, structural strength, waterproofing or compatibility with a particular substrate.
Privacy and browser processing
Values entered on this page are processed in the current browser session. SolvePilot does not require an account and does not receive the values entered into the calculator. Refreshing or closing the page clears the working values unless the browser itself restores a previous session. Avoid entering identifying or account information because the calculation needs summary values only.
Accuracy and verification
Accuracy depends first on input quality. Confirm definitions, scales, dates and source information before entering a value. Keep an independent record of any result used for planning because this page does not create an official statement or retain a calculation history.
Limits of this estimate
Rectangular constant-depth geometry; user-supplied product volume ratio, not mass ratio or cure design. Results describe the entered model only. Check source measurements and assumptions independently. Positive numeric inputs smaller than 0.000000001 are outside the supported calculation range. Calculator inputs are processed locally by the shared browser interface; no professional evaluation is performed.
Sources and review information
Frequently asked questions
Can I use a 2:1 weight ratio?＋
Not in the volume-ratio field. A mass ratio and volume ratio can differ when component densities differ. Use the product-specific instructions for the exact resin/hardener pair and their stated measurement basis. This tool does not derive densities or approve substitutes.
Does the allowance change the mixing ratio?＋
No. A 10% allowance multiplies total mixed volume by 1.10 and then splits it in the same ratio. Adding extra hardener alone is not an allowance calculation and is not supported by this tool.
How do I estimate an irregular cavity?＋
Break it into non-overlapping measured sections with a defensible average thickness for each. Calculate sections separately and add their volumes. Curves, tapers and displaced inserts can require a different geometric model or a measured capacity test.
Are litres the same as kilograms of epoxy?＋
No. Converting volume to mass requires reliable component or mixed-product density for the relevant conditions. This calculator reports litres and deliberately does not assume one litre weighs one kilogram. Review the product sheet if purchasing quantities are given by mass.
Will this tell me a safe pour depth?＋
No. Allowed depth and batch size depend on the specific formulation and instructions. A volume estimate does not evaluate reaction heat, cure behavior or the project environment. Follow the current product guidance before handling or pouring.