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Measure the project before buying materials.

Plan room area, paint, flooring, HVAC, appliance energy and residential solar projects.

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Home Improvement Calculators

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Square footage

Find square footage for one or more rectangular areas, with an optional extra-material allowance.

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Paint calculator

Estimate paintable wall area and gallons required from room dimensions, openings, coats and coverage.

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Flooring and tile

Estimate floor area, purchase area and individual tiles including cutting waste.

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HVAC BTU estimate

Create a preliminary cooling-capacity estimate from area, ceiling height, climate, people and windows.

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Electricity cost

Estimate appliance energy use and electricity cost from watts, operating time and local price.

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Solar payback

Estimate annual solar production, electricity savings and a simple payback period.

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Wallpaper rolls

Estimate wallpaper rolls from wall perimeter, height, openings, usable roll coverage and pattern allowance.

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Room lighting

Estimate target lumens and fixture count from room area, intended light level and fixture output.

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Insulation R-value

Combine insulation-layer R-values and estimate U-factor and steady-state heat flow.

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Water-heating cost

Estimate water-heating energy and daily or monthly electricity cost from use, temperature rise and efficiency.

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Lawn seed

Estimate grass-seed weight and whole bags from lawn area, application rate and extra allowance.

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Carpet quantity

Estimate square yards and approximate linear roll length for one or more rooms.

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Tile grout

Estimate grout volume, weight and bag count from tile dimensions and joint size.

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Ceiling paint

Estimate ceiling area, paint volume and whole gallons from dimensions, coats and coverage.

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Home heat loss

Create a simplified conductive heat-loss and planning heat-load estimate.

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Generator size

Estimate generator kW and kVA capacity from running loads, starting surge and reserve.

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Ceiling fan size

Estimate room airflow and a common fan-span reference from room dimensions.

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Mulch quantity

Calculate cubic feet, cubic yards and bag count for a rectangular landscape bed.

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About home improvement calculators

Are the home improvement calculators free?

Yes. Every tool in this collection is free to use without an account.

Does MW SysArc receive what I enter?

No. Inputs and calculations remain inside your browser and are not transmitted to or stored by MW SysArc.

Can I use the results for important decisions?

Treat results as practical estimates. Verify consequential academic, employment, financial or access decisions against the applicable rules and source records.