FOCUSED COLLECTION
Free Online Calculators
Use practical calculators for percentages, loans, age, units, currency, fuel, tips, BMI and compound interest. Each calculator explains its assumptions so you can review the result before using it.
Age Calculator
Your exact age to the day
Percentage Calculator
Change, increase, decrease & more
Loan / EMI Calculator
Payments, interest & schedule
Unit Converter
Length, weight, speed & more
Currency Converter
Convert with latest daily or custom rates
BMI Calculator
Calculate body mass index
Compound Interest Calculator
Project growth with recurring contributions
Tip Calculator
Split a bill and calculate the tip
Fuel Cost Calculator
Estimate trip fuel cost
WORKFLOW GUIDE
Get a more useful calculation
Enter the units and baseline carefully, then change one assumption at a time when comparing scenarios. Results are estimates or mathematical outputs; important financial, health or legal decisions need confirmation from an appropriate professional or official source.
- Check whether the calculation asks for a percentage of a value or a percentage change.
- Use a current quoted rate or price when the result depends on currency, fuel or lending terms.
- Read the tool’s assumptions and limitations before treating an estimate as a decision.
Private, focused workflows
Most processing happens locally in your browser. Review each tool’s instructions and limitations before using an output for an important decision or submission. The individual pages explain supported formats, assumptions and trade-offs before you download a result.
Browse all tools →Which calculator should I use?
Pick the calculator that matches the question you are really asking.
- What will my monthly payment be?Principal, rate, term and extra payments
- How much will savings grow?Balance with regular contributions
- What is X% of Y, or how much did it change?Percent of, percent change and more
- How old am I on a given date?Years, months and days
- How much is a trip going to cost in fuel?Distance, MPG and fuel price
- How do we split the bill?Tip and per-person amount
- What is this in another currency?Daily reference rates
- Convert miles to km or pounds to kgLength, weight, speed and more
- What does my BMI say?A screening number, not a diagnosis
Frequently asked questions
Are the results accurate enough for decisions?
They are mathematically correct for the inputs you give, but real life adds fees, taxes, rate changes and rounding. Treat results as estimates and confirm important figures with your lender, bank or professional.
Why does the loan calculator differ from my bank?
Banks may include fees, insurance, a different day-count or compounding convention, or a variable rate. Compare the assumptions, not only the payment.
Is my data sent anywhere?
No. Calculations run in your browser. The Currency Converter requests only a rate for the selected currency pair.
Can I get a payment schedule?
Yes. The Loan Calculator can download the full monthly schedule.