Hi Product Hunt 👋 I built CalcDelta to make everyday calculations easier to check, not just faster to run. The site combines instant results with formulas, worked examples and notes about assumptions. It currently includes 734 calculators across finance, health, math and everyday tasks, with the full library available in six languages. A few examples: • Mortgage calculations with taxes, insurance, PMI, HOA and extra payments • Compound interest with formulas and worked examples • BMI results with clear limitations — BMI is a screening measure, not a diagnosis Everything works in the browser, no account is required, and the calculators are free. I’d especially appreciate feedback on which explanations are easiest to verify and where an important edge case may be missing.

CalcDelta

Free calculators with clear formulas and worked examples

Free calculators with clear formulas and worked examples