Featured tool
Word Unscrambler
Enter your jumbled letters and find every word you can make — with Scrabble scores, blank tiles, and optional filters to narrow the list by starting letter, ending, length and more.
Also available as an anagram solver, Scrabble helper and word finder.
Free online calculators
106 calculators across finance, tax, property, health and everyday maths. Every one is free, needs no sign-up, and comes with a written explanation of what the number actually means.
Finance
Tax, investment, loan & retirement calculators
- S-Corp Salary Optimizer
- Freelancer Tax Rate Calculator
- Self-Employment Tax Calculator
- Quarterly Estimated Tax Calculator
- Tax Bracket Calculator 2026
- Capital Gains Tax Calculator 2026
- Roth IRA Conversion Calculator
Real Estate
Mortgage, rent & property calculators
- Mortgage Affordability Calculator
- Mortgage Refinance Break-Even
- Buy vs Rent Calculator
- Home Sale Net Proceeds Calculator
- Home Equity Calculator
- HELOC vs Cash-Out Refi Calculator
- Investment Property ROI Calculator
Health
BMI, calorie, fitness & medical calculators
- BMI Calculator
- Calorie Calculator
- TDEE Calculator
- Macronutrient Calculator
- Body Fat Calculator
- Ideal Body Weight Calculator
- Water Intake Calculator
Legal
LLC, settlement & business formation tools
Insurance
Medicare, life & health insurance calculators
Math
Scientific, percentage & statistics calculators
Converters
Unit, currency & measurement converters
Time & Date
Age, date difference & countdown tools
Home & DIY
Paint, tile, concrete & home improvement calculators
CalcProLabs is a free collection of 106 calculators covering finance, tax, mortgages and property, health, and everyday maths. Everything runs in your browser, nothing requires an account, and no calculation you enter is stored or sent anywhere.
Where a calculator touches money or health, the page also explains the method behind it — the formula, a worked example, the assumptions involved, and the mistakes that most often produce a misleading answer. Tax figures state the year they apply to and cite the source they came from, because those change annually and a number without a date is not much use.
These tools are for information and planning. They are not financial, tax, legal or medical advice, and for consequential decisions there is no substitute for a qualified professional who knows your circumstances. If you spot an error, please tell us — corrections are genuinely welcome.