Free Home Improvement Calculators
Fast, free and mobile-friendly calculators for painting, concrete, tiling, flooring, landscaping, cooling and fencing. Enter a few numbers and get an instant answer — no sign-up, no email required.
Paint Calculator
How much paint do I need? Estimate gallons for walls, doors and windows.
Concrete Calculator
Volume in cubic yards plus the number of 60 lb and 80 lb bags required.
Tile Calculator
How many tiles do I need for a floor or wall, including waste allowance.
Flooring Calculator
Estimate laminate or vinyl flooring in square feet and boxes with waste.
Mulch Calculator
Cubic yards and bags of mulch needed for garden beds and borders.
Sod & Grass Seed Calculator
Lawn area in square feet, sod pallets and pounds of grass seed.
BTU / AC Size Calculator
What size air conditioner do I need? Recommended BTU for any room.
Wallpaper Calculator
How many wallpaper rolls do I need for a room, with pattern waste.
Gravel Calculator
Crushed stone or gravel in cubic feet, cubic yards and tons.
Fence Calculator
Pickets, posts and rails needed for a wood privacy fence.
Why Use Our Calculators?
Home improvement projects fail for two reasons: underestimating materials and overbuying. Our calculators use standard industry formulas and real-world defaults, so you can order the right amount the first time.
- Instant results – calculations update as you type, with no submit button.
- Shareable links – your inputs are saved in the URL, so you can send results to a contractor or friend.
- Explained numbers – every input and formula is explained in plain English below each tool.
- Free forever – no accounts, no paywalls, no downloads.
How to Get the Most Accurate Estimate
- Measure in feet and inches using a tape measure, not a guess.
- Round up slightly: materials are cheaper to return than to run out of mid-project.
- Always include waste (10% for most materials) for cuts, mistakes and odd shapes.
- Confirm coverage numbers with the product label before ordering.