The circle calculator is designed for calculations of radius, diameter, circumference or area. For successful calculation, you need to know and enter into the calculator at least one of them. Then press send or enter to run calculations.

Circle parameters sketch:

Circle calculator form:

Circle calculator variables and constants explanation:

r – radius C – circumference d – diameter A – area π– 3,1415926535

Formula for circle circumference calculation:

Formula for circle area calculation:

Circle calculator use:

Circle calculation is used in many industries and in a huge number of calculations. This is at least some of them:

perimeter of a tree trunk, limb, twig, stem, pipe, tube, hose, duct, wire, rod, cord, thread, rope, tunnel, pillar

cross-sectional area of a tree trunk, limb, twig, stem, pipe, tube, hose, duct, wire, rod, cord, thread, rope, tunnel, pillar

partial calculations of geometric shapes like cilinder, cone, sphere, barrel, torus and other rotational shapes