FREE TOOLS. TRACEABLE MATH. NO ACCOUNT.Build your estimate.
Build your estimate.
Know your numbers.
Concrete, drywall, roofing and painting calculators built for homeowners, tradespeople and project planners. Use your measurements and prices to make decisions with more confidence.
Your project.
Your assumptions.Free tools. No account required.
Your assumptions.Free tools. No account required.
Start with a popular tool
Concrete Calculator ↗Calculate slabs, footings, walls, columns, cubic yards and concrete bag quantities.Concrete Slab Cost Calculator ↗Estimate concrete material, labor, site preparation, reinforcement and delivery.Roof Pitch Calculator ↗Convert rise and run into pitch, angle, slope, multiplier and rafter length.Drywall Calculator ↗Count sheets from room or custom wall area with ceiling and opening deductions.Free Construction Estimate Generator ↗Create an editable estimate with line items, totals, printable view and PDF export.Paint Calculator ↗Plan interior paint and primer by measured walls, openings and finish.
Continue with painting tools
Paint calculator ↗Plan paint, primer and purchase quantities for one room or a whole project.Interior painting cost calculator ↗Estimate paint, primer, supplies and optional labor for an interior painting project using your room measurements and actual prices.Exterior paint calculator ↗Estimate measured exterior walls. Add each wall or custom shape separately.Ceiling paint calculator ↗Keep ceiling paint separate from wall colours and round its purchase correctly.
Tools for every project stage
Start with materials and geometry, then turn the quantities into a project budget. The original painting tools remain available in full.
Understand every estimate
Make assumptions visible, adjust costs to your region and compare scenarios before committing.
See our methodology →Painting guides and measurement methods
How much paint do I need? ↗Turn measured surface area into a practical purchase, with a worked room example.How to measure a room for paint ↗Measure walls, openings and ceilings without confusing floor area with wall area.How many coats of paint should I plan for? ↗Compare coat counts while keeping primer and finish paint separate.Paint coverage per gallon and litre ↗Convert label coverage and understand how it changes a purchase estimate.How much primer do I need? ↗Calculate primer independently from finish paint and account for spot priming.How to estimate painting cost ↗Build a transparent budget from purchase quantities and local labor assumptions.