Pi Calculator
Multiply any number by pi, keep the exact multiple of π and get a decimal approximation. Evaluate pi powers, fractions and trig expressions.
Multiply numbers by pi and evaluate expressions
Use this pi calculator to multiply a number by π or evaluate formulas involving pi, radians, trigonometry and powers.
Enter 49pi to see the exact result 49π and its decimal approximation, about 153.938. For a decimal factor such as 19.2, enter 19.2pi.
Learn the concept
Try these examples
49\pi19.2\pi\frac{\pi}{2}
Quick reference
Multiplication by pi: x × π.Pi squared and cubed: π² and π³.Circumference: C = 2πr.
FAQ
How do I enter pi?
Use the pi button or type pi.
Can I calculate trig functions with pi?
Yes. Use RAD mode for expressions such as cos(pi).
Sources and review
Last reviewed: