United States calculator
Solve a simple circular roadway or layout curve
Enter radius and central angle to calculate arc length, chord, tangent, external distance and middle ordinate.
circular arc geometry
Project inputs
Circular Curve Length Calculator results
How this Circular Curve Length Calculator works
All results use exact simple circular-curve relationships from the entered radius and central angle.
Important: Use project design standards and a licensed surveyor/engineer for construction staking.
What assumptions should I verify?
Check every entered quantity, unit, rate and rule against the current U.S. source that applies to your project. The calculator does not silently substitute worldwide conventions.
Is information sent anywhere?
No. Calculations run locally in the browser and the module contains no analytics, remote requests or stored personal data.