Geometry & Shapes2 options compared

Arc Length Calculator

Calculates the length of an arc of a circle and the area of a sector using simple input fields for radius, central angle in degrees or radians. User enters the known values, clicks calculate, and receives precise measurements. Students, teachers, architects, engineers, and anyone needing to determine distances along curved paths in circles will find this tool invaluable for quick, accurate...

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Editors’ Top PickBased on community votes
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Side by side

Arc Length Calculator options compared

ToolBest forStrengthsLimitations
Omni Calculator
omnicalculator.com
Quick arc and sector math
  • Provides both arc length and sector area
  • Simple radius and angle inputs
  • Fewer unit options for radius and output
Pi Day Calculators
piday.org
Wide unit conversions
  • Supports many radius units (mm, inches, etc.)
  • Many output units for arc length
  • No sector area calculation
  • Requires manual conversion for diameter to radius

Buyer's guide

How to choose a arc length calculator

When you need both the arc length and the sector area, choose the Omni Calculator tool for a single-step result. If you need to work with unusual units — like inches for radius and feet for output — or want to convert between many measurement systems, Pi Day Calculators gives you more dropdown options, but you’ll have to handle the sector area yourself.

Questions

Arc Length Calculator FAQ

Can I calculate arc length if I only know the diameter?
Yes. The Pi Day Calculators tool lets you enter the diameter directly, and it will compute the radius internally. The Omni Calculator tool requires the radius value.
Does either tool calculate the area of the sector?
Only the Omni Calculator tool includes sector area in its output. Pi Day Calculators focuses on arc length and does not provide sector area.
Which tool supports more output units for the arc length?
Pi Day Calculators supports a wider range of output units, including millimeters, inches, feet, yards, miles, and various square units for area. Omni Calculator offers fewer output unit options.
Is the central angle limited to degrees, or can I use radians?
Both tools accept degrees and radians. Pi Day Calculators also lists gradians, minutes of arc, seconds of arc, and milliradians as angle options.
Do I need to convert units before entering values?
No. Pi Day Calculators has dropdowns for radius and output units, so you can enter inches and get feet back. Omni Calculator expects numerical values in the units you provide, but does not have built-in conversion dropdowns.
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