| Constant | Symbol | Approach Value | Units |
| 1 | Speed of light in vacuum | c | $3\times 10^8$ | ms-1 |
| 2 | Permeability of vacuum | $\mu_o$ | $1.257\times 10^{-6}$ | NA-2 |
| 3 | Permittivity of vacuum | $\epsilon _o$ | $8.85\times 10^{-12}$ | F m-1 |
| 4 | Newtonian constant of gravitation | G | $6.67\times 10^{-11}$ | $m^3 kg^{-1}s^{-2}$ |
| 5 | Planck constant | h | $6.63\times 10^{-34}$ | Js |
| 6 | Planck constant in eV | | $4.135\times 10^{-15}$ | eV s |
| 7 | h-bar | h-bar | $1.055\times 10^{-34}$ | Js |
| 8 | h-bar in eV | | $6.58\times 10^{-16}$ | eV s |
| 9 | Planck mass | m_p | $2.177\times 10^{-8}$ | kg |
| 10 | Planck length | l_p | $1.62\times 10^{-35}$ | m |
| 11 | Planck time | t_p | $5,39\times 10^{-44}$ | s |
| 12 | Elementary charge | e | $1.60\times 10^{14}$ | C |
| 13 | Quantum magnetic flux | $\Phi_o$ | $2,068\times 10^{-15}$ | Wb |
| 14 | Josephson frequency-voltage quotient | | $4,84\times 10^{-34}$ | V-1s-1 |
| 15 | Quantized Hall conductance | | $3.87\times 10^{-5}$ | $\Omega ^{-1}$ |
| 16 | Quantized Hall resistance | R_H | $2,58\times 10^{11}$ | $\Omega$ |
| 17 | Bohr magneton | $\mu_B$ | 9.274015431e-24 ± 3.15317e-30 | JT-1 |
| 18 | Bohr magneton in eV | | 5.7883826352e-05 ± 5.15166e-12 | eV T-1 |
| 19 | Bohr magneton in Hz | | 13996241842 ± 4198.87 | T-1s-1 |
| 20 | Bohr magneton in wavenumbers | | 46.68643714 ± 1.40059e-05 | m-1T-1 |
| 21 | Bohr magneton in kelvins | | 0.671709957 ± 5.70953e-06 | KT-1 |
| 22 | Nuclear magneton | $\mu_N$ | 5,050786617e-27 ± 1.71727e-33 | JT-1 |
| 23 | Nuclear magneton in eV | | 3.1524516628e-08 ± 2.80568e-15 | eV T-1 |
| 24 | Nuclear magneton in Hz | | 7622591,423 ± 2.28678 | T-1s-1 |
| 25 | Nuclear magneton in wavenumbers | | 0.025426228177 ± 7.62787e-09 | m-1T-1 |
| 26 | Nuclear magneton in kelvins | | 0,000365824631 ± 3.10951e-09 | KT-1 |
| 27 | Fine structure constant | $\alpha$ | 0.0072973530833 ± 3.28381e-10 | |
| 28 | Inverse fine structure constant | | 137,035989561 ± 6.16662e-06 | |
| 29 | Rydberg constant | $R_y$ | 10973731.53413 ± 0.0131685 | m-1 |
| 30 | Rydberg constant in Hz | | 3.289841949939e + 15 ± 3.94781e + 06 | s-1 |
| 31 | Rydberg constant in joules | | 2.179874113e-18 ± 1.30792e-24 | J |
| 32 | Rydberg constant in eV | | 13.60569814 ± 4.08171e-06 | eV |
| 33 | Bohr radius | $a_o$ | 5.2917724924e-11 ± 2.3813e-18 | m |
| 34 | Hartree Energy | $E_h$ | 4.359748226e-18 ± 2.61585e-24 | J |
| 35 | Hartree energy in eV | | 27.211396181 ± 8.16342e-06 | eV |
| 36 | Quantum of circulation | | 0.00036369480733 ± 3.23688e-11 | m2s-1 |
| 37 | Electron mass | $m_e$ | 9.109389754e-31 ± 5.37454e-37 | kg |
| 38 | Electron mass in u | | 0,00054857990313 ± 1.26173e-11 | u |
| 39 | Electron mass in eV | | 510999.0615 ± 0.1533 | eV |
| 40 | Electron-muon mass ratio | | 0.0048363321871 ± 7.2545e-10 | |
| 41 | Electron-mass ratio | | 0.00054461701311 ± 1.08923e-11 | |
| 42 | Electron-deuteron mass ratio | | 0.0002724437076 ± 5.44887e-12 | |
| 43 | Electron-alpha-particle mass ratio | | 0,0001370933543 ± 2.87896e-12 | |
| 44 | Electron specific charge | | -175881962530 ± -52764.6 | C kg-1 |
| 45 | Electron molar mass | | 5.4857990313e-07 ± 1.26173e-14 | mol mol-1 |
| 46 | Electron Compton wavelength | $\lambda _c$ | 2.4263105822e-12 ± 2.15942e-19 | m |
| 47 | Electron Compton wavelength over 2 pi | $\lambda_c$ | 3.8615932335e-13 ± 3.43682e-20 | m |
| 48 | Electron classical radius | $r_e$ | 2.8179409238e-15 ± 3.66332e-22 | m |
| 49 | Electron Thomson cross section | $\Sigma _e$ | 6.652461618e-29 ± 1.79616e-35 | m2 |
| 50 | Electron magnetic moment | | 9.284770131e-24 ± 3.15682e-30 | JT-1 |
| 51 | Electron magnetic moment in Bohr magnetons | | 1.0011596521931 ± 1.00116e-11 | |
| 52 | Electron magnetic moment in nuclear magnetons | | 1838.28200037 ± 3.67656e-05 | |
| 53 | Electron magnetic moment anomaly | $a_e$ | 0.0011596521931 ± 9.97301e-12 | |
| 54 | Electron g-factor | $g_e$ | 2.0023193043862 ± 2.00232e-11 | |
| 55 | Electron-muon magnetic moment ratio | | 206.7669673 ± 3.1015e-05 | |
| 56 | Electron-proton magnetic moment ratio | | 658.210688166 ± 6.58211e-06 | |
| 57 | Muon mass | | 1.883532711e-28 ± 1.14895e-34 | kg |
| 58 | Muon mass in u | | 0.11342891317 ± 1.70143e-08 | u |
| 59 | Muon mass in eV | | 105658389.34 ± 33.8107 | eV |
| 60 | Muon-electron mass ratio | | 206.7682623 ± 3.10152e-05 | |
| 61 | Molar mass muons | | 0,00011342891317 ± 1.70143e-11 | mol mol-1 |
| 62 | Muon magnetic moment | | 4.490451415e-26 ± 1.48185e-32 | JT-1 |
| 63 | Muon magnetic moment in Bohr magnetons | | 0.0048419709771 ± 7.26296e-10 | |
| 64 | Muon magnetic moment in nuclear magnetons | | 8.890598113 ± 1.33359e-06 | |
| 65 | Anomaly magnetic moment moment | your | 0.001165923084 ± 8.39465e-09 | |
| 66 | Muon G-factor | g_mu | 2.00233184617 ± 1.68196e-08 | |
| 67 | Muon-proton magnetic moment ratio | | 3.1833454747 ± 4.77502e-07 | |
| 68 | Proton mass | m_p | 1,67262311e-27 ± 9,86848e-34 | kg |
| 69 | Proton mass in u | | 1.00727647012 ± 1.20873e-08 | u |
| 70 | Proton mass in eV | | 938272312.8 ± 281,482 | eV |
| 71 | Proton-electron mass ratio | | 1836.15270137 ± 3.67231e-05 | |
| 72 | Proton-muon mass ratio | | 8.880244413 ± 1.33204e-06 | |
| 73 | Proton specific charge | | 95788309.29 ± 28.7365 | C kg-1 |
| 74 | Molar mass protons | | 0.00100727647012 ± 1.20873e-11 | mol mol-1 |
| 75 | Proton Compton wavelength | $\alpha _{cp}$ | 1.3214100212e-15 ± 1.17605e-22 | m |
| 76 | Proton magnetic moment | | 1.4106076147e-26 ± 4.79607e-33 | JT-1 |
| 77 | Proton magnetic moment in Bohr magnetons | | 0.00152103220215 ± 1.52103e-11 | |
| 78 | Proton magnetic moment in nuclear magnetons | | 2.79284738663 ± 6.42355e-08 | |
| 79 | Diamagnetic shielding correction for protons H_2O, spherical sample, 298.15 K | $\Sigma _{H_2O}$ | 2.568915e-05 | |
| 80 | Shielded proton moment H_2O, spherical sample, 298.15 K | mu_p ' | 1.4105713847e-26 ± 4.79594e-33 | JT-1 |
| 81 | Shielded proton moment in Bohr magnetons | | 0.00152099312917 ± 1.67309e-11 | |
| 82 | Shielded proton moment in nuclear magnetons | | 2.79277564264 ± 6.42338e-08 | |
| 83 | Proton gyromagnetic ratio | $\gamma _p$ | 267522128.81 ± 80.2566 | T-1s-1 |
| 84 | Neutron mass | $M_N$ | 1.67492861e-27 ± 9.88208e-34 | kg |
| 85 | Neutron mass in u | | 1.00866490414 ± 1.41213e-08 | u |
| 86 | Neutron mass in eV | | 939565632.8 ± 281.87 | eV |
| 87 | Neutron-electron mass ratio | | 1838.6836624 ± 4.0451e-05 | |
| 88 | Neutron-proton mass ratio | | 1.0013784049 ± 9.01241e-09 | |
| 80 | Molar mass neutron | | 0.00100866490414 ± 1.41213e-11 | mol mol-1 |
| 90 | Neutron Compton wavelength | $\lambda_{Cn}$ | 1.3195911012e-15 ± 1.17444e-22 | m |
| 94 | Neutron magnetic moment | | 9,66237074e-27 ± 3.96157e-33 | JT-1 |
| 95 | Neutron magnetic moment in Bohr magnetons | | 0.0010418756325 ± 2,5005e-10 | |
| 96 | Neutron magnetic moment in nuclear magnetons | | 1.9130427545 ± 4.5913e-07 | |
| 97 | Neutron-electron magnetic moment ratio | | 0.0010406688225 ± 2.49761e-10 | |
| 98 | Neutron-proton magnetic moment ratio | | 0.6849793416 ± 1.64395e-07 | |
| 99 | Deuteron mass | $m_d$ | 3.34358602e-27 ± 1.97272e-33 | kg |
| 100 | Deuteron mass in u | | 2,01355321424 ± 2.41626e-08 | u |
| 101 | Deuteron mass in eV | | 1875613395.7 ± 562,684 | eV |
| 102 | Deuteron-electron mass ratio | | 3670.48301475 ± 7.34097e-05 | |
| 103 | Deuteron-proton mass ratio | | 1.9990074966 ± 5.99702e-09 | |
| 104 | Deuteron molar mass | | 0.00201355321424 ± 2.41626e-11 | mol mol-1 |
| 105 | Deuteron magnetic moment | $mu_d$ | 4,330737515e-27 ± 1,47245e-33 | JT-1 |
| 106 | Deuteron magnetic moment in Bohr magnetons | | 0.000466975447991 ± 8.87253e-12 | |
| 107 | Deuteron magnetic moment in nuclear magnetons | | 0.85743823024 ± 2.40083e-08 | |
| 108 | Deuteron-electron magnetic moment ratio | | 0.000466434546091 ± 8.86226e-12 | |
| 109 | Deuteron-proton magnetic moment ratio | | 0.307012203551 ± 5.21921e-09 | |
| 110 | Avagadro constant | $N_A$ | 6.022136736e + 23 ± 3.55306e + 17 | mole-1 |
| 111 | Atomic mass constant | your | 1.66054021e-27 ± 9.79719e-34 | kg |
| 112 | Atomic mass constant in eV | | 931494322.8 ± 279,448 | eV |
| 113 | Faraday constant | F | 96485.30929 ± 0.0289456 | C mol-1 |
| 114 | Molar Planck constant | | 3,9903132336e-10 ± 3.55138e-17 | J s mol-1 |
| 115 | | N_A hc | 0.1196265811 ± 1.06468e-08 | J m mol-1 |
| 116 | Molar gas constant | R | 8.3145107 ± 6.98419e-05 | J mol-1K-1 |
| 117 | Boltzmann constant | k | 1.38065812e-23 ± 1.17356e-28 | JK-1 |
| 118 | Boltzmann constant in eV | | 8.61738573e-05 ± 7.2386e-10 | eV K-1 |
| 119 | Boltzmann constant in Hz | | 20836741800 ± 175029 | K-1s-1 |
| 120 | Boltzmann constant in wavenumbers | | 69.5038759 ± 0.000583833 | m-1K-1 |
| 121 | Molar volume ideal gas, STP | $V_m$ | 0.0224141019 ± 1.88278e-07 | m3mol-1 |
| 122 | Loschmidt constant | $n_o$ | 2.68676323e + 25 ± 2.28375e + 20 | m-3 |
| 123 | Stefan-Boltzmann constant | $\Sigma$ | 5.6705119e-08 ± 1.92797e-12 | W m-2K-4 |
| 124 | First radiation constant | $c_1$ | 3.741774922e-16 ± 2.24506e-22 | W m2 |
| 125 | Second radiation constant | c_2 | 0.0143876912 ± 1.20857e-07 | m K |
| 126 | Wien displacement law constant | b | 0.00289775624 ± 2.43412e-08 | m K |
| 127 | Electron volt | eV | 1.6021773349e-19 ± 4.80653e-26 | J |
| 128 | Atomic mass unit | u | 1.66054021e-27 ± 9.79719e-34 | kg |
| 129 | Standard atmosphere | ATM | 101325 | Pa |
| 130 | Standard acceleration of gravity | $g_n$ | 9.80665 | ms-2 |
