Units
Paint Quantity Calculator (Coverage, Coats, Dilution)
Calculate pre-dilution and post-dilution paint volume, plus can count, for each coating stage.
How to use
- Set the unit system and container size.
- Enter area, coverage, coat count, and dilution for each stage.
- Review required paint (pre/post dilution), can count, and leftover.
- Copy the result or share the URL when you need to pass the calculation to others.
Calculation assumptions
- Dilution means added thinner as a percentage of base paint. Example: 10% means 0.1 thinner for 1.0 paint.
- When coverage is pre-dilution based: pre = (A / C) × N, post = pre × (1 + d).
- When coverage is post-dilution based: post = (A / C) × N, pre = post / (1 + d).
- If waste allowance is set, both pre and post values are multiplied by (1 + w).
- Can count is rounded up from the pre-dilution total divided by container size.
Notice
This result is an estimate. Actual paint demand varies with surface condition, temperature, absorption, application method (roller/brush/spray), and practical losses (container residue, splatter, etc.). Always prioritize on-site conditions and manufacturer specifications.
FAQ
Should I enter coverage as pre-dilution or post-dilution?
Use whichever basis is written in your product specification, and switch the coverage basis in advanced settings.
Why is can count calculated from pre-dilution volume?
In practice, purchase units are usually based on base paint containers, so pre-dilution volume is the clearer order basis.
Is waste allowance required?
No. It is optional. The default is 10%, and you can set it to 0% if you do not need it.
Can I calculate with very high dilution values?
Yes, but high dilution may exceed product recommendations, so confirm manufacturer guidance before use.
Can shared URLs reproduce the same inputs?
Yes. The share URL button copies a link that includes the current input state.