Construction & real estate calculators that just work
Sixteen fast, free tools for contractors, tradespeople, investors and homeowners. No sign-up, no downloads — results update as you type.
- Instant results
- 16 calculators
- No account needed
Construction Conversions
Switch between metric and imperial units used on job sites and plan sets.
Trade Calculators
Field math for roofers, tilers, carpenters, plumbers and electricians.
Roof Pitch & Area Calculator
Pitch ratio, angle, roof area and shingle squares.
Tile Coverage Calculator
Tiles, boxes and grout volume for any room.
Board Foot / Lumber Calculator
Board feet and lumber cost from thickness, width and length.
Pipe Size / Flow Rate Converter
Cross-sectional area and GPM, L/min and CFM conversions.
Wire Gauge / Electrical Load Calculator
Recommended AWG, load in watts and voltage drop.
Real Estate Finance
Loan, mortgage and refinance math with full payment breakdowns.
Renovation & Estimation
Budget ranges for new builds, additions and room remodels.
Investment Analysis
Underwrite rentals, flips and BRRRR deals before you buy.
Rental ROI / Cash Flow Calculator
Monthly cash flow, cash-on-cash return and cap rate.
Cap Rate & Property Value Calculator
Solve for cap rate, value or NOI in either direction.
Fix & Flip Profit Calculator
Net profit, ROI and the 70% rule maximum offer.
BRRRR & Rent vs Buy Calculator
Cash-out refinance results and a rent-versus-buy comparison.
Built for the job site and the spreadsheet
Every calculator shows its formulas, states its assumptions and updates instantly as you type. Whether you are sizing conductors on a long run, pricing out a kitchen remodel or underwriting a rental, the math is transparent and the inputs are the ones that actually move the number.
Nothing here requires an account and nothing is stored on a server — calculations run entirely in your browser, which is why results appear the instant you change a field. Share any calculator with a link and your colleague lands on the same tool.