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 | Liters & Gallons Estimate | CalcBE
Estimate paint from room dimensions or custom surfaces. Adjust coats, waste, substrate absorption, and primer to see liters, gallons, and suggested can counts.
- Interior paint calculator (simple) | CalcBE
Estimate wall and ceiling paint area, litres/gallons, extra allowance, and cans from room size or a known area. Metric/US units, 1–4 coats, shareable URL.
- Exterior Paint Area & Quantity Calculator | CalcBE
Estimate exterior wall area and paint gallons or liters from building dimensions, wall segments, or a known area. Adjust doors, windows, coats, waste, primer, and coverage presets.
- Roof Paint Area & Quantity Calculator | CalcBE
Estimate roof paintable area and paint gallons or liters from building size, roof slope, or a known area. Adjust overhangs, skylights, coats, waste, primer, and coverage presets.
- 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 Estimator (Exterior & Roof) | CalcBE
Estimate exterior, roof, trim, fence, and deck paint costs from area or house size using preset or custom unit rates. Add overhead, tax, and share a quick quote.
- Industrial DFT/WFT & paint consumption calculator | CalcBE
Convert dry/wet film thickness from volume solids, see theoretical coverage and paint use, or reverse-calc DFT from actual consumption with density and a shareable URL.
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.