Home improvement · DIY
Calculators that show their work.
Transparent, well-designed calculators for home improvement and DIY projects. Every formula is public, every number is explained, and nothing is hidden behind a signup.
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The math is visible
Every calculator shows the formula it used. You can verify the answer, understand the inputs, and adjust for your specific situation.
No signup, no email capture
Tools are free and unrestricted. No walls, no trials, no dark patterns.
Sources are cited
Coverage rates, conversion factors, and sizing formulas come from manufacturer specifications and industry references. Linked on every methodology page.