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Calculate each component’s volume and whether there is enough paint from the total paint volume, A:B mix ratio, area to paint and number of coats.

📘 How to Use

  1. Choose your unit system (US fl oz and sq ft, or Metric ml and m²), then enter the total paint volume you intend to mix.
  2. Input the specific mixing ratio for Component A and Component B.
  3. Adjust the number of coats, the target surface area, and the coverage rate printed on the can (sq ft per gallon in US units, m² per litre in Metric).
  4. Review the exact amount needed for each component and verify if the total mixed amount is sufficient.

Paint Mixing Ratio Calculator

ml

Enter the base (A) to hardener/thinner (B) ratio — check the product label.

A
:
B
2
15
m²
m²/L
A: 75%
B: 25%
Component A
375 ml
Component B
125 ml
Total mixed
500 ml
Required 1250 ml
Available 500 ml
✓ You have enough paint

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Paint Mixing Ratio Calculator | Precise 2-Part Coating & Coverage Estimation

This online tool computes the exact amounts of Component A and Component B needed for two-part paints, clear coats, or resins based on your desired ratio. It also evaluates your project parameters to determine if your planned mixed volume will successfully cover your target surface area.

💡 About This Tool

  • Precise Ratio Calculation Determines the exact amount of Component A and Component B (in US fl oz or ml) based on a user-defined ratio (e.g., 3:1) and the total target volume (up to 3,400 fl oz or 100,000 ml).
  • Visual Ratio Representation Displays a percentage bar that updates as you type, helping you visually confirm the exact proportion of each component in the final mix.
  • Project Coverage Verification Calculates the total volume of paint required by factoring in the surface area (sq ft or m²), the number of coats (ranging from 1 to 5), and the manufacturer's coverage rate (sq ft per gallon or m² per litre).
  • Shortage Alerts Automatically compares your planned mixing volume against the required volume. If you do not have enough paint, the tool displays a precise deficit warning, showing exactly how much more paint is needed.

🧐 Frequently Asked Questions

Q. What does the coverage rate indicate?

A. The coverage rate defines how much area one unit of your specific paint or coating can cover in a single coat: square feet per US gallon in US units, or square meters per litre in Metric. You can typically find this value on the product label or the manufacturer's technical data sheet.

Q. Can I use this for non-paint materials like epoxy resin?

A. Yes. The calculator works purely with liquid volume proportions and area mathematics. As long as you are measuring by volume and have a specific A:B ratio (such as epoxy resin and hardener), the mathematical output will be accurate.

📚 Paint Mixing & Unit Tips

Working with US and Metric Units

The English version starts in US units: US fluid ounces (fl oz) for volumes, square feet (sq ft) for the area, and square feet per gallon (sq ft/gal) for the coverage rate. The switch above the fields changes everything to Metric (milliliters, square meters and square meters per litre) and back, and it converts the numbers already typed in the fields. The conversions used are exact: 1 US gallon equals 128 US fl oz or 3.785411784 litres, so 1 US fl oz is 29.5735295625 ml, and 1 square foot is 0.09290304 square meters. Coverage on US cans is usually printed as a range in square feet per gallon, for example 350 to 400 sq ft per gallon on a technical data sheet for an interior latex paint; type the number from your own can.

Evaluating Your Final Verdict

The tool provides a definitive "You have enough paint" or "Paint is short" status based on hard mathematics. However, when planning a professional coating application, the calculated required volume represents the absolute minimum needed under perfect conditions. General industry practice suggests mixing an additional 5% to 10% of material. This buffer compensates for paint trapped in mixing containers, absorption by applicator rollers, and slight variations in surface porosity.