Tools
Calculator, unit converters, and fundamental physical constants.
Scientific Calculator
Unit Converter
Length
100
Mass
1000
Energy
0.001
Physical Constants
| Quantity | Symbol | Value | Unit |
|---|---|---|---|
| Speed of light | c | 2.99792458×10⁸ | m/s |
| Gravitational constant | G | 6.67430×10⁻¹¹ | m³/kg·s² |
| Planck constant | h | 6.62607015×10⁻³⁴ | J·s |
| Elementary charge | e | 1.602176634×10⁻¹⁹ | C |
| Avogadro constant | Nₐ | 6.02214076×10²³ | mol⁻¹ |
| Boltzmann constant | k | 1.380649×10⁻²³ | J/K |
| Gas constant | R | 8.314462618 | J/mol·K |
| Electron mass | mₑ | 9.1093837×10⁻³¹ | kg |
| Proton mass | mₚ | 1.67262192×10⁻²⁷ | kg |
| Vacuum permittivity | ε₀ | 8.8541878128×10⁻¹² | F/m |
| Vacuum permeability | μ₀ | 1.25663706212×10⁻⁶ | N·A⁻² |
| Stefan–Boltzmann | σ | 5.670374419×10⁻⁸ | W/m²·K⁴ |