How It Works
This calculator works in 4 steps.
Enter the mixing ratio
Type base : hardener : reducer, such as 4:1:1, or 2:1 with 0 reducer.
Choose the basis
Select by volume or by weight, as the data sheet states.
Enter the total mix
Type the amount of ready-to-spray mix required.
Read the components
The calculator returns each component amount and the pot life reminder from the user's data sheet entry.
The Formula
The formula divides the total mix by the sum of ratio parts and multiplies by each part.
p = V_total / (a + b + c)V_base = a × p; V_hardener = b × p; V_reducer = c × p% = 100 × c / (a + b)- a : b : c:
- Base, hardener, and reducer parts
- V_total:
- Total mix volume
- p:
- Volume of 1 part
1,000 mL of a 4:1:1 clearcoat mix needs 666.7 mL base, 166.7 mL hardener, and 166.7 mL reducer.
Conversion Table
The conversion table splits 6 mix volumes by common 2K mixing ratios.
| Ratio (base:hardener:reducer) | Total mix | Base | Hardener | Reducer |
|---|---|---|---|---|
| 4:1:1 | 1,000 mL | 666.7 mL | 166.7 mL | 166.7 mL |
| 2:1:0 | 750 mL | 500 mL | 250 mL | 0 mL |
| 4:1:0.5 | 500 mL | 363.6 mL | 90.91 mL | 45.45 mL |
| 3:1:1 | 1,200 mL | 720 mL | 240 mL | 240 mL |
| 8:1:1 | 1,000 mL | 800 mL | 100 mL | 100 mL |
| 1:1:0 | 400 mL | 200 mL | 200 mL | 0 mL |
What Is the Multicomponent Paint Mixing Calculator?
The Multicomponent Paint Mixing Calculator is a tool that splits a target mix volume into paint (base), hardener (activator), and reducer amounts in the system's mixing ratio, such as 4:1:1. Each component is measured separately in the order the data sheet specifies.
Two-component (2K) coatings, such as automotive clearcoats and epoxy floor paints, cure by chemical reaction between base and hardener. An off-ratio mix cures soft, slow, or brittle. The calculator takes the ratio from the technical data sheet, supports volume or weight ratios, and returns amounts in mL, fl oz, and grams when densities are given.
Common Uses
There are 5 main uses of this calculator.
Automotive refinishing
Painters mix clearcoat and basecoat systems.
Epoxy floors
Installers mix 2:1 or 1:1 epoxy kits by volume.
Marine coatings
Boat yards mix 2K antifouling and topcoat systems.
Industrial coatings
Shops mix polyurethane and epoxy systems for equipment.
Waste reduction
Painters mix only the amount needed within pot life.