Chemical Mixing Ratio Calculator
A ratio on a data sheet is easy to read and easy to get wrong when you need 17 L, not one cup. This calculator converts a parts ratio into litres of each component for the batch size you need, with an allowance for losses.
Your numbers
For a 4:1 mix, A is 4.
For a 4:1 mix, B is 1.
Reducer, thinner or catalyst. Use 0 for a two-part mix.
Extra to mix for line fill, cup residue and spillage.
Your results
Ratios are by volume. If the supplier ratio is by weight, convert using each component density before measuring. Follow the product data sheet for pot life and induction time.
Carry mix ratios from ERP to the floor
Optional: a short review of delivering controlled mix instructions and lot traceability from your ERP.
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How to use it
Enter the parts for each component as written on the product data sheet. A 4:1 mix is A equals 4 and B equals 1, and a 10:5:1 mix uses all three fields. Then enter the finished volume and an allowance for waste. The calculator returns the litres of each component to measure and each component's share of the mix. Mix only what you can use within pot life, and measure each component into a graduated vessel or through a calibrated meter.
- Use 0 for the third component on two-part products.
- Check whether the ratio is by volume or by weight.
- Round to what your measuring vessel can resolve.
The arithmetic
Each component volume equals the batch volume multiplied by its parts divided by total parts. For a 4:1:0.5 mix, total parts are 5.5, so A is 72.7 percent, B is 18.2 percent and C is 9.1 percent. For 20 L plus a 5 percent allowance, mix 21 L: about 15.27 L of A, 3.82 L of B and 1.91 L of C. The allowance is applied to the total, so ratios stay exact.
Common mistakes
The biggest error is mixing by volume when the supplier specifies weight. Epoxies, polyurethanes and some adhesives are often specified by weight because densities differ, and a volume mix can drift outside the cure window. Others: not accounting for induction time, mixing more than the pot life allows, reusing a contaminated measuring vessel, and applying reducer as a percent of A rather than parts of the total.
- Check the data sheet revision for the ratio.
- Record lot numbers of each component.
- Do not eyeball a mix ratio on a critical coating.
Frequently Asked Questions
How do I convert a 4:1 ratio to litres?
Add the parts (4 plus 1 equals 5), then divide each by the total. For 10 L finished, A is 4 divided by 5 times 10, or 8 L, and B is 2 L. This calculator does the same for up to three components and adds an allowance.
Is the ratio by volume or by weight?
Read the data sheet. Many paints and reducers are by volume; many epoxies and polyurethanes are by weight. If it is by weight, weigh each component or convert using density, otherwise the cure can be wrong.
How much waste allowance should I add?
It depends on equipment. Spray lines, pumps and cups hold material that never reaches the part. Five percent is a common starting point for small jobs, but measure your own residual and adjust.
Can I use it for dosing additives in ppm?
Not directly. Parts ratios suit bulk components. For ppm dosing use a dilution or dosing calculation based on concentration, such as C1V1, and confirm the active content of the additive from its certificate.
For plants running paint, coatings or two-part products, Netray can help carry mixing ratios and lot traceability from ERP formulas to the shop floor.
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