One calculator at a time,
done properly.
Open an instrument, fill it in, and get the full picture — not just a headline number. Every calculation explained, nothing stored.
Age Calculator
Your exact age, zodiac sign, and how long you've actually been alive.
All instruments
10 availableFrequently asked questions
Is Reckon free to use?
Yes. Every instrument on this page is free, with no account or sign-up required.
Is my data saved or sent anywhere?
No. Every calculation runs directly in your browser. Nothing you type is stored, logged, or sent to a server. Favorites and recently-used calculators only last for this browser tab.
How accurate are the results?
Standard calculations (BMI, EMI, percentages, unit conversion) use exact formulas — the same math you'd get from a calculator or spreadsheet. The age calculator's second-by-second numbers are worked out from your exact birth date and the current time, so they update the moment you load the page.
Are the BMI and calorie calculators medical advice?
No. They give general estimates based on standard formulas (like Mifflin-St Jeor for calories). For personal health or nutrition decisions, please check with a doctor or registered dietitian.
How is the loan (EMI) figure calculated?
It uses the standard reducing-balance EMI formula based on your principal, monthly interest rate, and number of months, so it matches what most banks quote.
Can I save or print my result?
Yes. Once a result appears, use Copy to copy a text summary, or Print to open your browser's print dialog — which also lets you save the result as a PDF.