Home project math, made simple.
Estimate materials for common home improvement, garden and DIY projects using clear measurements, visible formulas and practical planning notes.
Explore calculatorsBuilt for planning, not guesswork
HomeMathTools focuses on everyday questions such as “How much paint do I need?”, “How many tiles should I order?” and “How much gravel or soil will I need?” Each calculator explains the assumptions behind the number so you can decide what to check before buying materials.
Results are estimates. Product labels, supplier information, site conditions and applicable requirements should always take priority.
What you will find here
- 20 practical calculators
- Worked examples and formulas
- Measurement tips and common mistakes
- Related guides and calculators
- Clear limitations for construction-related estimates
Popular calculators
Start with the project closest to what you are planning.
Paint Calculator
Estimate wall paint from room dimensions, openings, coats and product coverage.
Use calculator →FlooringFlooring Calculator
Calculate floor area and order quantity with a waste allowance.
Use calculator →ConcreteConcrete Calculator
Estimate concrete volume for simple rectangular slabs and pads.
Use calculator →GardenMulch Calculator
Estimate mulch volume from bed dimensions and desired depth.
Use calculator →OutdoorFence Calculator
Get a basic panel and post material estimate for a straight run.
Use calculator →OutdoorDeck Calculator
Estimate decking boards and a basic joist count for planning.
Use calculator →Guides that explain the number
A calculator result is more useful when you understand how it was produced. Our guides cover measurement, formulas, waste allowances, product coverage and the limitations of simple estimates.
Browse guidesBefore you order
Check the product's package size, coverage or yield, the supplier's minimum order, delivery requirements and the conditions at your site. For structural or regulated work, use the relevant plans and professional advice.