Calculator
Use preset ratios for common 2K systems or type your own ratio parts manually. The page stays in a single-column flow, while the form itself uses a responsive 3-column, 2-column, and 1-column layout.
Example Data Table
These sample jobs show how common construction coating batches break down after adding waste allowance.
| Job example | Ratio | Usable target | Waste | Paint | Hardener | Reducer | Final mixed |
|---|---|---|---|---|---|---|---|
| Steel handrail touch-up | 4:1:1 | 600 ML | 5% | 420 ML | 105 ML | 105 ML | 630 ML |
| Site equipment enamel | 4:1:0 | 1000 ML | 10% | 880 ML | 220 ML | 0 ML | 1100 ML |
| Protective topcoat frame | 3:1:1 | 1500 ML | 8% | 972 ML | 324 ML | 324 ML | 1620 ML |
Formula Used
The calculator first protects your usable target with waste allowance, then splits the final mixed batch by the ratio parts.
1) Final mixed volume
Final mixed volume = Target usable volume × (1 + Waste % ÷ 100)
2) Total ratio parts
Total parts = Paint parts + Hardener parts + Reducer parts
3) Component volume
Component volume = Final mixed volume × (Component parts ÷ Total parts)
4) Component percentage
Component percentage = (Component parts ÷ Total parts) × 100
5) Area estimate
Estimated area = (Usable liters × Coverage rate) ÷ Number of coats
Reducer may be optional for some products. If a system uses no reducer, enter zero reducer parts or pick a preset that already excludes it.
How to Use This Calculator
- Choose a preset ratio or enter custom paint, hardener, and reducer parts.
- Enter the usable mixed amount you want available for spraying or rolling.
- Add a waste percentage to cover overspray, cup residue, line loss, or transfer loss.
- Set the number of coats, job area, and expected product coverage rate.
- Optionally enter unit costs for each component to estimate total batch cost.
- Press Calculate Mix to see the result above the form.
- Review the detailed table, component percentages, and Plotly graph.
- Download the calculation as CSV or PDF for site planning records.
FAQs
1) What is 2K paint?
2K paint is a two-component coating system. It combines a resin base with a hardener, and sometimes reducer. After mixing, it cures chemically, which usually gives better durability, adhesion, and chemical resistance than simple air-dry coatings.
2) Why should I add waste allowance?
Waste allowance helps cover real job losses. Some paint stays in cups, hoses, rollers, filters, or spray equipment. Adding a small percentage reduces the risk of under-mixing and stopping work before the final coat is complete.
3) Should I always follow the manufacturer ratio first?
Yes. This calculator is for planning and quick batch breakdowns. The product’s technical data sheet should always control the final mix ratio, reducer limit, induction time, pot life, and application rules on the actual project.
4) Can I use this calculator when no reducer is required?
Yes. Pick a preset like 4:1 or 2:1, or set reducer parts to zero. The calculator will still divide the batch correctly between paint and hardener without adding any thinner or reducer volume.
5) Which units does the calculator support?
You can work in milliliters, liters, or fluid ounces. The calculator keeps the component volumes in your chosen unit and converts internally to liters only for area coverage estimates.
6) Does temperature change the ratio?
Usually the fixed mix ratio stays the same, but product instructions may allow different reducer choices or amounts at different temperatures. Always check the product sheet because temperature can also affect pot life, flash time, and finish quality.
7) What does the coverage section tell me?
It compares your usable mixed amount against the entered area, coverage rate, and number of coats. This helps estimate whether the planned batch is enough, though real porosity, texture, and overspray can change field results.
8) Can I save the calculation for project records?
Yes. After calculation, use the CSV button for spreadsheet-style records or the PDF button for a printable summary. That is useful for batching logs, costing checks, or site documentation during coating work.