meter: $m$
inch: ${in} = {{{0.0254}} {{m}}}$
foot: ${{ft} = {{{12}} {{in}}}} = {{{0.3048}} {{m}}}$

speed of light: ${{c} = {{{299792458}} \cdot {{{\frac{1}{s}} {m}}}}} = {1}$
second: ${s} = {{{299792458}} {{m}}}$
${m} = {{{3.3356409519815\cdot{10^{-09}}}} {{s}}}$
hertz: ${{Hz} = {\frac{1}{s}}} = {{{3.3356409519815\cdot{10^{-09}}}} \cdot {{\frac{1}{m}}}}$

gravitational constant: ${{G} = {{{6.67384\cdot{10^{-11}}}} \cdot {{\frac{{m}^{3}}{{{kg}} \cdot {{{s}^{2}}}}}}}} = {1}$
kilogram: ${{kg} = {{{7.4256484500929\cdot{10^{-28}}}} {{m}}}} = {{{2.4769297065148\cdot{10^{-36}}}} {{s}}}$
${m} = {{{1.3466837364049\cdot{10^{27}}}} {{kg}}}$
${s} = {{{4.0372562748544\cdot{10^{35}}}} {{kg}}}$
newton: ${{N} = {\frac{{{kg}} \cdot {{m}}}{{s}^{2}}}} = {8.2621481642303\cdot{10^{-45}}}$
pascal: ${{Pa} = {\frac{kg}{{{m}} {{{s}^{2}}}}}} = {{{8.2621481642303\cdot{10^{-45}}}} \cdot {{\frac{1}{{m}^{2}}}}}$
joule: ${{J} = {\frac{{{kg}} \cdot {{{m}^{2}}}}{{s}^{2}}}} = {{{8.2621481642303\cdot{10^{-45}}}} {{m}}}$
watt: ${{W} = {\frac{{{kg}} \cdot {{{m}^{2}}}}{{s}^{3}}}} = {2.7559559767946\cdot{10^{-53}}}$

Coulomb's constant: ${{{k_e}} = {{{8987551787.3682}} {{kg}} \cdot {{{m}^{3}}} {{\frac{1}{{C}^{2}}}} {{\frac{1}{{s}^{2}}}}}} = {1}$
coulomb: ${{C} = {{{s}} {{A}}}} = {{{8.6172202304994\cdot{10^{-18}}}} {{m}}}$
ampere: ${{A} = {{\frac{1}{s}} {C}}} = {2.8743952693098\cdot{10^{-26}}}$
volt: ${{V} = {\frac{{{kg}} \cdot {{{m}^{2}}}}{{{{s}^{3}}} {{A}}}}} = {9.5879505724916\cdot{10^{-28}}}$
farad: ${{F} = {\frac{{{{s}^{4}}} {{{A}^{2}}}}{{{kg}} \cdot {{{m}^{2}}}}}} = {{{8987551787.3682}} {{m}}}$
ohm: ${{\Omega} = {\frac{{{kg}} \cdot {{{m}^{2}}}}{{{{s}^{3}}} {{{A}^{2}}}}}} = {0.033356409519815}$
siemens: ${{S} = {\frac{{{{s}^{3}}} {{{A}^{2}}}}{{{{m}^{2}}} {{kg}}}}} = {29.9792458}$
weber: ${{Wb} = {\frac{{{kg}} \cdot {{{m}^{2}}}}{{{{s}^{2}}} {{A}}}}} = {{{2.8743952693098\cdot{10^{-19}}}} {{m}}}$
tesla: ${{T} = {\frac{kg}{{{{s}^{2}}} {{A}}}}} = {{{2.8743952693098\cdot{10^{-19}}}} \cdot {{\frac{1}{m}}}}$
henry: ${{H} = {\frac{{{kg}} \cdot {{{m}^{2}}}}{{{{s}^{2}}} {{{A}^{2}}}}}} = {{{10000000}} {{m}}}$

permeability and permittivity of free space
${{k_e}} = {\frac{1}{{{4}} {{π}} \cdot {{{\epsilon_0}}}}}$
${{\epsilon_0}} = {{{2.781625140134\cdot{10^{-11}}}} {{{C}^{2}}} {{{s}^{2}}} {{\frac{1}{kg}}} {{\frac{1}{π}}} {{\frac{1}{{m}^{3}}}}}$
in natural units: ${{\epsilon_0}} = {\frac{0.25}{π}}$
${{c}^{2}} = {\frac{1}{{{{\mu_0}}} \cdot {{{\epsilon_0}}}}}$
${{\mu_0}} = {{{4\cdot{10^{-07}}}} {{kg}} \cdot {{m}} {{π}} \cdot {{\frac{1}{{C}^{2}}}}}$
in natural units: ${{\mu_0}} = {{{4}} {{π}}}$

electron charge:
${C} = {{{6.2415093414\cdot{10^{18}}}} {{e}}}$
${{e} = {{{1.6021765654775\cdot{10^{-19}}}} {{C}}}} = {{{1.3806308312865\cdot{10^{-36}}}} {{m}}}$

electron mass: ${{{m_e}} = {{{9.1093835611\cdot{10^{-31}}}} {{kg}}}} = {{{6.7643079921784\cdot{10^{-58}}}} {{m}}}$
Boltzmann's constant: ${{{k_B}} = {{{1.3806488\cdot{10^{-23}}}} \cdot {{\frac{{{{m}^{2}}} {{kg}}}{{{K}} {{{s}^{2}}}}}}}} = {1}$
Kelvin: ${{K} = {{{1.3806488\cdot{10^{-23}}}} {{kg}} \cdot {{{m}^{2}}} {{\frac{1}{{s}^{2}}}}}} = {{{1.1407124948367\cdot{10^{-67}}}} {{m}}}$
reduced Planck constant: ${{\hbar} = {{{1.05457173\cdot{10^{-34}}}} {{J}} {{s}}}} = {{{2.6121000456877\cdot{10^{-70}}}} {{{m}^{2}}}}$

Planck units:
length ${{{l_P}} = {\sqrt{\frac{{{\hbar}} \cdot {{G}}}{{c}^{3}}}}} = {{{1.6161992592771\cdot{10^{-35}}}} {{m}}}$
mass ${{{m_P}} = {\sqrt{{\frac{1}{G}} {{{\hbar}} \cdot {{c}}}}}} = {{{2.176509257258\cdot{10^{-08}}}} {{kg}}}$
time ${{{t_P}} = {\sqrt{\frac{{{\hbar}} \cdot {{G}}}{{c}^{5}}}}} = {{{5.3910604358067\cdot{10^{-44}}}} {{s}}}$
charge ${{{q_P}} = {\sqrt{{{4}} {{π}} \cdot {{{\epsilon_0}}} \cdot {{\hbar}} \cdot {{c}}}}} = {{{1.8755459603513\cdot{10^{-18}}}} {{C}}}$
temperature ${{{T_P}} = {\sqrt{{\frac{1}{{k_B}}} {{{\hbar}} \cdot {{{c}^{2}}}}}}} = {{{1.4168331341969\cdot{10^{32}}}} {{K}}}$

fine structure constant
${{\alpha} = {\frac{{{{k_e}}} \cdot {{{e}^{2}}}}{{{\hbar}} \cdot {{c}}}}} = {0.0072973525476011}$