Mathematical Constants Reference Tool
Look up mathematical constants like Pi, e, the Golden Ratio, Tau, and more. See precise values, reciprocals, and descriptions.
Pi (π)
3.141592653589793
Ratio of a circle's circumference to its diameter
Symbol
π
Approximate Value
3.141592653589793
Reciprocal (1/x)
0.318309886183791
Squared
9.869604401089358
All Constants
π = 3.1415926536 | e = 2.7182818285 | φ = 1.6180339887 | √2 = 1.4142135624 | √3 = 1.7320508076 | ln(2) = 0.6931471806 | ln(10) = 2.3025850930 | τ = 6.2831853072 | γ = 0.5772156649 | G = 0.9159655942