| Gravitational constant | G | 6.673 × 10-11 N*m2/kg2 | |
| Avogadro's number | NA | 6.022 × 1023/mol | |
| Boltzmann's constant | k | 1.381 × 10-23 J/K | |
| Gas constant | R = NAk | 8.314 J/mol*K | = 8.206 × 10-2 L*atm/mol*K |
| pi | pi | 3.142 | |
| Coulomb's law constant | 1/(4*pi*e0) | 8.988 × 109 N*m2/C2 | use: 9 × 109 N*m2/C2 |
| Ampere's law constant | µ0 | 4*pi × 10-7 N/A2 | by definition |
| Speed of light | c | 2.998 × 108 m/s | use: 3 × 108 m/s2 |
| Electron mass | me | 9.110 × 10-31 kg | = 0.5111 MeV/c2 |
| Proton mass | mp | 1.673 × 10-27 kg | = 938.3 MeV/c2 |
| Neutron mass | mn | 1.674 × 10-27 kg | = 939.6 MeV/c2 |
| Unified mass unit | u | 1.661 × 10-27 kg | = 931.5 MeV/c2 |
| Elementary charge | e | 1.602 × 10-19 C | |
| Planck's constant | h | 6.626 × 10-34 J*s | = 4.136 × 10-15 eV*s |
| Stephan-Boltzmann constant | sigma | 5.671 × 10-8 W/(m2*K4) | |
| Bohn radius | a0 | 5.292 × 10-11 m | |
| Compton wavelength | lamdaC = h/2*pi*me*c | 2.426 × 10-12m |