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Free
In-App Purchases
About
This app simplifies circle geometry calculations by instantly solving for all properties (radius, area, diameter, circumference) from a single known value. It's ideal for students, engineers, designers, and DIYers needing quick, accurate measurements.
✓Calculate all circle properties from one input
✓View mathematical formulas used
✓Customize Pi value for precision
✓Clean and simple user interface
✓Fast and accurate results
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What's New in Circle Calculator
1.0.0
October 12, 2026
A completely rebuilt Circle Calculator: • Enter radius, diameter, circumference or area and see all four, drawn on the circle • New Ring tool: outer circle + hole gives the ring's area and width (washers, pipes, tracks) • Type π and √ right in the field: 3π, √50, 2×π×5 • New Arc & Sector tool: arc length, chord, rise, sector and segment area • Formulas with your numbers, plus a searchable formula library • History: reopen any recent calculation • Copy any result with one tap • Two layouts: values drawn on the shape, or Classic (Settings → Calculator layout) • iPad and Mac support, landscape, dark mode • Now in English, German, Japanese, Turkish, Spanish, French, Italian and Russian • π presets, decimal places, comma or point • Fewer interruptions, and Pro now removes every ad
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Subscriptions & In-App Purchases
Weekly Premium
Premium use without ads
$1.997 Days
3 Days trialEvents
New Ring and Arc tools, values on the circle
Oct 13, 2026 — Oct 27, 2026
User reviews
Developer apps
FAQ
What are the subscription plans for Circle Calculator Pi?
Circle Calculator Pi offers several subscription plans: Weekly Premium for $1.99, Monthly Premium for $4.99, and Annual Premium for $24.99. These plans likely unlock additional features or remove limitations.
How does Circle Calculator Pi help with learning geometry?
Circle Calculator Pi aids learning by allowing users to see the exact mathematical formulas used for calculations. This helps in understanding the principles of circle geometry and double-checking work.
Can I adjust the precision of calculations in Circle Calculator Pi?
Yes, you can customize the value of Pi within Circle Calculator Pi. This feature is useful for advanced mathematical or engineering problems requiring higher precision than the default 3.14.
What devices is Circle Calculator Pi available on?
Circle Calculator Pi is available for iPhone and iPod devices. It is designed for iOS users who need a reliable geometry calculation tool.
How often is Circle Calculator Pi updated?
The latest version of Circle Calculator Pi is 0.2.0, and it was last updated on August 12, 2025. This indicates a recent update, suggesting ongoing development and support.
Does Circle Calculator Pi have ads?
Yes, Circle Calculator Pi contains advertisements. As it is a free app with in-app purchases, ads are part of its monetization strategy.
What is the age rating for Circle Calculator Pi?
Circle Calculator Pi has an age rating of 4+. This suggests it is suitable for a wide audience, including young students learning basic geometry concepts.
How does Circle Calculator Pi compare to manual calculations?
Circle Calculator Pi eliminates the need for manual calculations and guesswork by instantly providing accurate results. It saves valuable time for students, professionals, and DIYers.
