Circle Calculator App

Circle Calculator is a FREE, clean, fast, and easy-to-use tool for calculating every measurement of a circle. Whether you're a student, engineer, designer, or just need a quick answer, Circle Calculator gets the job done instantly.

How it works

Enter any one known value — radius, diameter, circumference, or area — and the app instantly calculates all the other measurements for you. No need to remember formulas.

Key Features

- Calculate from radius, diameter, circumference, or area
- Supports multiple units: cm, m, inches, feet, and px
- Live visual canvas showing your circle drawn to scale
- Tap any result to copy it to your clipboard
- Calculation history with auto-save
- Built-in formulas reference (C = 2πr, A = πr², and more)
- Adjustable decimal precision (2, 4, 6, or 8 places)
- Dark mode support
- Available in 9 languages: English, Spanish, Portuguese, French, German, Italian, Dutch, Korean, and Japanese

Perfect for:

Students solving geometry homework, engineers working with circular parts, designers sizing circular elements, or anyone who needs a fast circle calculation.

Simple. Beautiful. Accurate.