2πr·|θ|/360

How is arc length computed?

For a circular arc, length L = 2πr × |θ| / 360 with radius r > 0 and central angle θ in decimal degrees (the formula uses the absolute value of θ).

Does the decimal separator matter?

This calculator uses plain decimal numbers. If a result looks wrong, check whether you used a comma instead of a dot (or vice versa) where the field expects one.