CalcFind is a collection of free calculators for everyday numbers and personal money questions: percentages, ages and dates now, with compound interest, retirement and paycheck calculators coming next.
What we do differently
- We show the working. Every answer comes with the steps that produced it, so you can follow the math and check it yourself.
- Your numbers stay with you. Calculations run in your browser. We don't collect, store or send what you type.
- Each page explains its topic. Alongside the calculator you'll find the formula, worked examples and the mistakes people commonly make.
- We test our math. Every formula has automated tests built from hand-worked examples, including awkward cases like leap-day birthdays and percentages of zero. See how we calculate.
Money calculators and accuracy
When we publish calculators that depend on tax rules or contribution limits, each one will name the tax year it uses and link to the official source, such as the IRS. Calculators give estimates for planning and are not financial, tax or legal advice.
Found a mistake?
If an answer looks wrong, please email contact@calcfind.com with the numbers you entered. We check every report and correct confirmed errors quickly.