By Zencalcy Editorial TeamLast reviewed About us
Get the distance around any circle from its radius with C = 2πr. A reference table for radii 1–10 sits below the tool for instant lookup.
Distance around a circle from its radius, plus a 1–10 table.
C = 2πr
| Symbol | Meaning |
|---|---|
| r | Circle radius (≥ 0) |
r = 5 → C = 2π × 5 ≈ 31.4159. Reference: r=1→6.2832, 2→12.5664, 3→18.8496, 4→25.1327, 5→31.4159, 6→37.6991, 7→43.9823, 8→50.2655, 9→56.5487, 10→62.8319.
Continue with the Percentage Calculator, all math calculators, or browse the full calculator directory.
Same idea — circumference is the special name for the perimeter of a circle.
Click to use the Absolute Value Calculator and get instant results.
Click to use the Basic Calculator and get instant results.
Click to use the Scientific Calculator and get instant results.
Click to use the Exponent Calculator and get instant results.
Click to use the Square Root Calculator and get instant results.
Click to use the Cube Root Calculator and get instant results.
Content updated: September 2026