diff --git a/buildscript/constants.toml b/buildscript/constants.toml
index 4da68cd..2fbed53 100644
--- a/buildscript/constants.toml
+++ b/buildscript/constants.toml
@@ -15,7 +15,7 @@ value = "3.141592653589793238462643383279502884197169399375105820974944592307816
 
 [[constant]]
 enum_name = "Phi"
-strings = ["φ", "phi"]
+strings = ["φ", "phi", "goldenratio"]
 value = "1.618033988749894848204586834365638117720309179805762862135448622705260462818902449707207204189391137"
 
 [[constant]]
@@ -23,6 +23,91 @@ enum_name = "Euler"
 strings = "e"
 value = "2.718281828459045235360287471352662497757247093699959574966967627724076630353547594571382178525166427"
 
+[[constant]]
+enum_name = "LightSpeed"
+strings = "c"
+value = "299792458 meter/second"
+
+[[constant]]
+enum_name = "ElectricConstant"
+strings = ["ε₀", "epsilon_zero", "eps_zero", "electricconstant"]
+value = "8.8541878128e-12 F/m"
+
+[[constant]]
+enum_name = "ElectronCharge"
+strings = ["electroncharge", "elementarycharge"]
+value = "1.602176634e-19 C"
+
+[[constant]]
+enum_name = "ElectronMass"
+strings = ["me", "m_e", "electronmass"]
+value = "9.1093837015-31 kg"
+
+[[constant]]
+enum_name = "ProtonMass"
+strings = ["mp", "m_p", "protonmass"]
+value = "1.67262192369e-27 kg"
+
+[[constant]]
+enum_name = "GravityConstant"
+strings = "G"
+value = "6.67430e-11 (m^3)/(s^2 * kg)"
+
+[[constant]]
+enum_name = "GravityEarth"
+strings = ["g₀", "g_zero", "gravity"]
+value = "9.80665 m/(s^2)"
+
+[[constant]]
+enum_name = "BoltzmannConstant"
+strings = ["k_B", "boltzmannconstant"]
+value = "1.380649e-23 J/K"
+
+[[constant]]
+enum_name = "FaradayConstant"
+strings = ["faradayconstant"]
+value = "9.64853321233100184e4 C/mol"
+
+[[constant]]
+enum_name = "MagneticConstant"
+strings = ["μ₀","mu_zero"]
+value = "1.25663706212 N/(A*A)"
+
+[[constant]]
+enum_name = "AvogadroConstant"
+strings = ["N_A", "avogadroconstant"]
+value = "6.02214076e23 mol^-1"
+
+[[constant]]
+enum_name = "PlanckConstant"
+strings = ["planckconstant"]
+value = "6.62607015e-34 J/Hz"
+
+[[constant]]
+enum_name = "Hbar"
+strings = ["ℏ", "h_bar"]
+value = "planckconstant / (2 pi)"
+
+[[constant]]
+enum_name = "GasConstant"
+strings = ["R", "gasconstant"]
+value = "avogadroconstant * boltzmannconstant"
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
 [[constant]]
 enum_name = "MPG"
 strings = "mpg"
diff --git a/src/parser/stage/find_subs.rs b/src/parser/stage/find_subs.rs
index 086fceb..8e31bfc 100644
--- a/src/parser/stage/find_subs.rs
+++ b/src/parser/stage/find_subs.rs
@@ -67,6 +67,13 @@ pub fn find_subs(
 					"chi"     => {Some("χ")},
 					//"psi"     => {Some("ψ")},  Conflict with pound / square inch
 					"omega"   => {Some("ω")},
+
+					// Constants
+					"epsilon_zero" => {Some("ε₀")},
+					"eps_zero"     => {Some("ε₀")},
+					"g_zero"       => {Some("g₀")},
+					"mu_zero"      => {Some("μ₀")},
+					"h_bar"        => {Some("ℏ")},
 					_ => {None}
 				};