Constants & Units · constant
Pi
π = 3.141 592 653 589 793… —
- Unit
- —
- Value
- 3.141 592 653 589 793…
- Exact
- yes
- Note
- Circumference over diameter. Appears in half the equations on this site, most of them not about circles.
- Symbol
- π
- Category
- Mathematical
- Numeric
- 3.141592653589793
- Uncertainty
- exact (irrational)
Open on the Constants & Units shelf — the interactive card, the filters, and everything alongside it.