Developer Utilities
Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.
Developer Utilities
Electrode potential vs pH calculator
hydrogen electrode Nernst, free
POST /chem/electrode-potential-ph$0.002Developer Utilities
Electrolysis time calculator
time to deposit mass from I, m, M, n, free
POST /chem/electrolysis-time$0.002Developer Utilities
Electron configuration calculator
ground-state config and valence electrons from atomic number, free
POST /chem/electron-configuration$0.002Developer Utilities
Electrorefining efficiency calculator
current efficiency from actual vs theoretical mass, free
POST /chem/electrorefining-efficiency$0.002Developer Utilities
Empirical formula calculator
from mass or percent composition
POST /chem/empirical-formula$0.002Developer Utilities
Empirical formula from masses calculator
ratio from mass and atomic mass
POST /chem/empirical-from-masses$0.002Developer Utilities
Reaction heat for amount calculator
Q = n·ΔH from moles and molar enthalpy, free
POST /chem/enthalpy-amount-scaling$0.002Developer Utilities
Enthalpy scaled by coefficients calculator
ΔH × factor for thermochemical equations, free
POST /chem/enthalpy-coefficient-scaling$0.002Developer Utilities
Heat of combustion per gram calculator
energy from molar ΔH and molar mass
POST /chem/enthalpy-combustion-per-gram$0.002Developer Utilities
Enthalpy of dilution calculator
molar ΔH_dil = q/n from heat and moles, free
POST /chem/enthalpy-dilution$0.002Developer Utilities
Enthalpy from heats of formation calculator
ΔH°_rxn free
POST /chem/enthalpy-from-formation$0.002Developer Utilities
Enthalpy from internal energy calculator
ΔH = ΔU + Δn_g RT
POST /chem/enthalpy-from-internal-energy$0.002Developer Utilities
Enthalpy of fusion calculator
ΔH_fus from heat and moles
POST /chem/enthalpy-of-fusion-moles$0.002Developer Utilities
Enthalpy of vaporization calculator
molar ΔH_vap = q/n from heat and moles, free
POST /chem/enthalpy-of-vaporization-moles$0.002Developer Utilities
Enthalpy of reaction calculator
ΔH from formation enthalpies
POST /chem/enthalpy-reaction$0.002Developer Utilities
Reaction entropy change calculator
ΔS from standard molar entropies
POST /chem/entropy-of-reaction$0.002Developer Utilities
Equilibrium constant calculator
Kc from concentrations, free
POST /chem/equilibrium-constant$0.002Developer Utilities
Equilibrium constant from cell potential
K from E°, n, T, free
POST /chem/equilibrium-constant-from-emf$0.002Developer Utilities
Equilibrium partial pressure from Kp calculator
gas stoichiometry, free
POST /chem/equilibrium-partial-pressure$0.002Developer Utilities
Equivalent weight calculator
EW = M / n from molar mass and valence, free
POST /chem/equivalent-weight$0.002Developer Utilities
Excess reactant remaining calculator
leftover mass free
POST /chem/excess-reactant-remaining$0.002Developer Utilities
Faraday electrolysis mass calculator
mass deposited from I, t, M, n, free
POST /chem/faraday-mass-deposited$0.002Developer Utilities
Final temperature of mixture calculator
two substances, free
POST /chem/final-temperature-two-substances$0.002Developer Utilities
First-order half-life calculator
t½ from rate constant k, free
POST /chem/first-order-half-life$0.002Developer Utilities
Formal charge calculator
valence, lone pairs, bonding electrons, free
POST /chem/formal-charge$0.002Developer Utilities
Fraction dissociated calculator
α from Ka and concentration, free
POST /chem/fraction-dissociated-from-ka$0.002Developer Utilities
Freezing mixture temperature calculator
ice-salt ΔTf from molality, free
POST /chem/freezing-mixture-temperature$0.002Developer Utilities
Freezing point depression calculator
ΔTf = i·Kf·m free
POST /chem/freezing-point-depression$0.002Developer Utilities
Gas collected over water calculator
dry gas partial pressure free
POST /chem/gas-collected-over-water$0.002Developer Utilities
Gas density at STP calculator
ρ from molar mass at 0 °C, 1 atm, free
POST /chem/gas-density-at-stp$0.002Developer Utilities
Ideal gas density calculator
ρ=PM/RT from P, M and T, free
POST /chem/gas-density-ideal$0.002Developer Utilities
Gas moles calculator
ideal gas n = PV/RT from pressure, volume and temperature, free
POST /chem/gas-moles-from-ptv$0.002Developer Utilities
Gas pressure from moles calculator
ideal-gas P=nRT/V, free
POST /chem/gas-pressure-from-moles$0.002Developer Utilities
Electrolysis gas volume calculator
Faraday charge to STP volume, free
POST /chem/gas-volume-electrolysis$0.002Developer Utilities
Gas volume from moles calculator
V = nRT/P ideal gas, free
POST /chem/gas-volume-from-moles$0.002Developer Utilities
Gay-Lussac final pressure calculator
P2 from P1, T1, T2 at constant V, free
POST /chem/gay-lussac-final-pressure$0.002Developer Utilities
Gay-Lussac's law calculator
final gas temperature from pressure, free
POST /chem/gay-lussac-final-temperature$0.002Developer Utilities
Spontaneity crossover temperature
T where ΔG = 0 from ΔH and ΔS
POST /chem/gibbs-crossover-temperature$0.002Developer Utilities
Gibbs free energy calculator
ΔG = ΔH − TΔS from enthalpy, entropy and temperature, free
POST /chem/gibbs-free-energy$0.002Developer Utilities
Gibbs energy from equilibrium constant calculator
ΔG° = −RT ln(K), free
POST /chem/gibbs-from-equilibrium$0.002Developer Utilities
Non-standard Gibbs free energy calculator
ΔG from ΔG°, Q, T
POST /chem/gibbs-non-standard$0.002Developer Utilities
Reaction spontaneity calculator
Gibbs ΔG from ΔH, ΔS, T
POST /chem/gibbs-spontaneity$0.002Developer Utilities
Graham's law calculator
effusion rate ratio from molar mass, free
POST /chem/graham-effusion-rate-ratio$0.002Developer Utilities
Graham effusion time calculator
t2 from t1 and molar masses, free
POST /chem/graham-effusion-time$0.002Developer Utilities
Unknown molar mass from effusion calculator
Graham's law free
POST /chem/graham-unknown-molar-mass$0.002Developer Utilities
Grams to moles calculator
n = m/M free
POST /chem/grams-to-moles$0.002Developer Utilities
Grams to particles calculator
mass and molar mass to N, free
POST /chem/grams-to-particles$0.002Developer Utilities
Half-life calculator
remaining amount after decay, free
POST /chem/half-life$0.002Developer Utilities
Number of half-lives calculator
elapsed time over t½, free
POST /chem/half-lives-elapsed$0.002Developer Utilities
Molar heat capacity ratio calculator
γ = Cp/Cv, free
POST /chem/heat-capacity-ratio$0.002Developer Utilities
Heat of neutralization calculator
molar ΔH from heat and moles of water
POST /chem/heat-of-neutralization$0.002Developer Utilities
Heat of solution calculator
molar ΔH_sol = q/n from heat and moles, free
POST /chem/heat-of-solution$0.002Developer Utilities
Heat required to raise temperature calculator
Q = m·c·ΔT from mass, c and ΔT, free
POST /chem/heat-to-raise-temperature$0.002Developer Utilities
Henderson–Hasselbalch calculator
buffer pH from pKa and ratio, free
POST /chem/henderson-hasselbalch$0.002Developer Utilities
Henry's law constant calculator
kH = c/p from concentration and partial pressure
POST /chem/henrys-law-constant$0.002Developer Utilities
Henry's law gas solubility calculator
c = k_H · p, free
POST /chem/henrys-law-solubility$0.002Developer Utilities
Hess's law calculator
overall reaction enthalpy from steps, free
POST /chem/hess-law$0.002Developer Utilities
Hydrate formula calculator
water of crystallization n from mass, free
POST /chem/hydrate-formula$0.002Developer Utilities
Hydrogen ion from weak acid calculator
[H+] from C and Ka, free
POST /chem/hydrogen-ion-weak-acid$0.002Developer Utilities
Hydroxide concentration from pOH calculator
[OH−] = 10^(−pOH)
POST /chem/hydroxide-from-poh$0.002