Age calculator
Your exact age on any date, from your DOB.
Open toolCircle calculator
Find area and circumference from a radius.
Your input stays in this browser. No account needed.
THE QUICK GUIDE
How to use circle calculator
Enter the labelled values, then process it. Copy or download the result.
How it works
Area = πr²; circumference = 2πr.
A useful example
Radius: 5 → Area: 78.5398163397 Circumference: 31.4159265359
Good to know
Use consistent units and currency. These are general calculations; verify important results.