Unit converter
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Home & Build
Sheet cutting, stairs, paint, roofing, and decking — measured math with clear diagrams.
Cooking
Recipe scaling and pan substitution — with more kitchen tools on the way.
Finance
Mortgage math for Canada and the US — the right compounding for each, CMHC or PMI insurance, and side-by-side comparison.
What are you working on? Pick one to see just the tools for it.
Plywood Cut Calculator
Split a sheet into equal pieces with exact kerf math and an SVG cut diagram.
Stair Calculator
Riser height, tread count, total run, and stringer length with a diagram and code checks.
Paint Coverage Calculator
Multi-room paint math with primer and topcoat coats, doors and windows subtracted.
Roof Pitch & Rafter Calculator
Run, rise, rafter length, roof angle, and slope factor with a cross-section diagram.
Deck Board Calculator
Deck boards, joist count, screw totals, and a top-down layout diagram.
Recipe Scaler
Scale any recipe up or down with smart ingredient handling.
Pan Substitution Calculator
Swap pan sizes by area, with depth adjustments.
Mortgage Calculator
Payment, insurance, and total interest for Canadian and US mortgages — each with the correct compounding.
Mortgage Comparison
Three mortgage scenarios side by side, with equity curves.
