Age Calculator
Exact age in years, months and days, plus totals and a birthday countdown.
5 tools
Calculators & Utilities
Everyday arithmetic without the mental overhead — age in exact days, body mass index, percentage change, loan repayments and unit conversion.
BMI Calculator
Body mass index in metric or imperial with category and healthy weight range.
Percentage Calculator
Four percentage modes: of, is-what, increase or decrease, and add or subtract.
EMI & Loan Calculator
Monthly instalment, total interest and a full amortisation schedule you can export.
Unit Converter
Convert length, weight, temperature, area, volume, speed, data and time.
About these tools
Some numbers are easy to get wrong. Working out an age across a leap year, converting a loan's annual rate into a monthly instalment, or deciding whether a price that fell 20% and then rose 20% is back where it started — these are all places where a confident guess is usually a wrong guess.
Each calculator here shows its working. You get the answer, the components behind it, and enough context to sanity-check the result rather than trusting a single number. The loan calculator prints a full amortisation schedule, the age calculator breaks the total into years, months and days as well as raw days, and the percentage calculator names which of the four common percentage questions you are actually asking.
Why use the tools here
- Shown workingResults include the intermediate values, so you can verify the answer instead of taking it on faith.
- Both unit systemsMetric and imperial inputs are supported wherever the measurement has two common systems.
- ExportableSchedules and results can be copied or downloaded as CSV for a spreadsheet.
- No data collectionCalculations run locally. Dates of birth, salaries and loan amounts are never transmitted.