What this tool is for
Paint Calculator handles a focused home project planning job: estimate gallons of paint from wall size, coats, and coverage. It is intentionally narrow so the formula and example stay visible beside the tool.
When to use it
Use it when you want to verify paint quickly, compare a few values, or explain the calculation to someone else without opening a spreadsheet.
Input notes
- Enter values that match the units or dates requested by the form.
- Use the reset state as a quick reference when you want to see a normal paint example.
- Review the limitation note before using the result outside a quick estimate.
Formula
gallons = (wall width x wall height x coats) / coverage per gallon
Worked example
A 10 by 12 foot wall with 2 coats and 350 sq ft coverage needs about 0.69 gallons.
What the result means
The output follows gallons = (wall width x wall height x coats) / coverage per gallon. The worked example shows the same calculation with real values: A 10 by 12 foot wall with 2 coats and 350 sq ft coverage needs about 0.69 gallons.
Limitations
This is an estimate. Surface texture, primer, windows, doors, waste, and paint brand can change the amount needed.
Before you rely on the result
Use the estimate before shopping or planning. Product coverage, waste, local code, site conditions, and safety requirements may change the final amount.
Privacy note
This page uses browser JavaScript only for the calculation. Marketivate does not need an account, upload, or database entry to produce the result.
Frequently asked questions
Should I round up?
Usually yes. Paint is commonly purchased in fixed container sizes.
Does it subtract windows?
Not yet. Use the net wall area if you want to subtract openings.
Last reviewed: 2026-07-11