Speed in a Circle Calculator
🪐 Gravity & circular motion. Use the Speed in a circle formula to find speed, radius, period: pick the value you want, type the others, and the answer updates as you go.
Speed29783 m/s
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Speed | m/s |
| Radius | m |
| Period | s |
Worked example
Find the speed when Radius = 1.496 × 10¹¹ m, Period = 3.156 × 10⁷ s.
Using v = (2π r)/T: Speed = 29783 m/s.
Frequently asked questions
What is the formula for Speed in a circle?
v = (2π r)/T.
What do the letters stand for, and what units are used?
Speed in m/s, Radius in m, Period in s.
How do you calculate speed?
Put the values into v = (2π r)/T. For example, with Radius = 1.496 × 10¹¹ m, Period = 3.156 × 10⁷ s, speed = 29783 m/s.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (speed, radius, period) and fill in the others: it rearranges the formula for you.
