How to choose (3 steps)
- If you already know the area, start with Paint Coverage for liters/gal and can counts.
- For exterior parts (walls/roof/fence/deck), use the matching calculator.
- For costs, use Paint Cost. For industrial coatings, use DFT/WFT.
Recommended (top 3)
If you are unsure where to start, these cover most paint planning needs.
Calculators
- Paint Coverage Calculator | How much paint do I need? | CalcBE
Estimate how much paint you need from room size or total area. Add coats, waste, surface type, and primer to get liters, gallons, and can counts.
- Interior Paint Calculator | Room area to gallons/liters | CalcBE
Estimate interior wall and ceiling paint from room dimensions or known area. Set coats, coverage, waste allowance, and can size to get liters/gallons and can count.
- Exterior Paint Calculator | Area, gallons, liters | CalcBE
Calculate exterior wall area and how much paint you need. Works from building size, wall-by-wall input, or known area, with openings, coats, waste, and primer.
- Roof Paint Calculator | Area, gallons, liters | CalcBE
Calculate roof paint area and paint quantity from roof size, slope, roof planes, or known area. Adjust skylights, exclusions, coats, waste, primer, and coverage.
- Fence Paint Area & Quantity Calculator | Gallons & Liters | CalcBE
Estimate fence paintable area and paint volume from run and height, panel mix, or a known area. Choose one-side/both-side, account for gates, coats, waste, primer, coverage overrides, and share the URL.
- Deck & Terrace Paint Area Calculator | Gallons & Liters | CalcBE
Estimate deck and terrace paintable area plus primer/topcoat gallons or liters from one rectangle, multiple zones, or a known area. Switch ft/m, include gaps and edges, add railing, set coats, waste, and coverage over…
- House Paint Cost Calculator (exterior, roof, trim) | CalcBE
Estimate house painting cost for exterior walls, roof, trim, fence, and deck. Use area or floor-size mode, then apply labor, material, overhead, discount, and tax.
- DFT/WFT Calculator | Paint consumption & coverage | CalcBE
Convert dry film thickness (DFT) and wet film thickness (WFT), estimate coverage and paint consumption, or reverse-calculate DFT from actual usage and volume solids.
What this page helps you do
- Runs in your browser. Inputs are not sent.
- Shareable URLs help you save and revisit settings.
- Switch units (metric / US) in supported calculators.
FAQ
How much area does 1 L (or 1 gal) cover?
Use the coverage on the product label. It varies a lot by surface, texture, and number of coats.
How much waste should I add?
As a starting point, 10–20% is common for DIY. Add more for complex shapes or spray application.
Do I need primer?
Often yes for bare wood, porous surfaces, metal, or uncertain old paint. Follow the product recommendation.
How do I handle multiple colors?
Split areas by color and estimate separately. Round up can counts for each color.
What is the difference between DFT and WFT?
DFT is dry film thickness. WFT is wet film thickness. Volume solids links the two.
Can I use the cost estimate as a real quote?
No. It is only a rough estimate. Real quotes depend on prep work, access, paint system, and many other factors.
Related links
- Unit conversion
Convert liters/gal and m²/ft² quickly.
- Tools directory
Browse all tools and calculators.