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
Dilution factor calculator
DF = V_final/V_stock and fold dilution, free
POST /chem/dilution-factor$0.002Developer Utilities
Degree of dissociation calculator
α from Kc and initial, free
POST /chem/dissociation-from-kc$0.002Developer Utilities
Empirical formula from percent composition calculator
free
POST /chem/empirical-from-percent$0.002Developer Utilities
Heat of formation from reaction calculator
unknown ΔH_f, free
POST /chem/enthalpy-of-formation-unknown$0.002Developer Utilities
Molar enthalpy calculator
ΔH = Q/n from heat and moles, free
POST /chem/enthalpy-per-mole$0.002Developer Utilities
Equilibrium constant from Gibbs calculator
K = exp(−ΔG°/RT), free
POST /chem/equilibrium-from-gibbs$0.002Developer Utilities
Equilibrium yield calculator
percent of theoretical maximum at, free
POST /chem/equilibrium-yield$0.002Developer Utilities
Formula units calculator
N = (m/M)·N_A from mass, free
POST /chem/formula-units$0.002Developer Utilities
Fraction of molecules above Ea calculator
f = e^(−Ea/RT), free
POST /chem/fraction-molecules-above-ea$0.002Developer Utilities
Freezing point depression calculator
ΔTf = i·Kf·m from molality, free
POST /chem/freezing-point-depression-molality$0.002Developer Utilities
Fuel energy content calculator
E = m × energy density, free
POST /chem/fuel-energy-content$0.002Developer Utilities
Effusion remaining fraction calculator
lighter gas left after, free
POST /chem/gas-leak-effusion-fraction$0.002Developer Utilities
Gas stoichiometry volume calculator
product gas V from moles, free
POST /chem/gas-stoichiometry-volume$0.002Developer Utilities
Gas volume at STP calculator
V = n × 22.4 L, free
POST /chem/gas-stp-volume$0.002Developer Utilities
Gas temperature from P, V, n calculator
T = PV/nR (ideal gas), free
POST /chem/gas-temperature-from-ptv$0.002Developer Utilities
Gas volume at NTP calculator
V = n × 24.0 L, free
POST /chem/gas-volume-at-ntp$0.002Developer Utilities
Gibbs free energy calculator
ΔG = ΔH − TΔS from enthalpy, free
POST /chem/gibbs-from-enthalpy-entropy$0.002Developer Utilities
Grams of product from moles calculator
n×MM in grams, free
POST /chem/grams-of-product-from-moles$0.002Developer Utilities
Grams of solute for molarity calculator
M×V×MM in grams, free
POST /chem/grams-solute-for-molarity$0.002Developer Utilities
Instantaneous rate from tangent calculator
|Δc|/Δt from two nearby, free
POST /chem/instantaneous-rate$0.002Developer Utilities
Equilibrium constant at new temperature
van't Hoff K2 from K1, free
POST /chem/k-at-new-temperature$0.002Developer Utilities
Kp from partial pressures calculator
equilibrium Kp = ∏P^ν, free
POST /chem/kp-from-partial-pressures$0.002Developer Utilities
Ksp from solubility calculator
Ksp = ∏(νᵢ·s)^νᵢ from molar s, free
POST /chem/ksp-from-solubility$0.002Developer Utilities
Le Chatelier pressure shift calculator
equilibrium vs pressure, free
POST /chem/le-chatelier-pressure-shift$0.002Developer Utilities
Limiting reagent from masses calculator
two reactants, free
POST /chem/limiting-reactant-two$0.002Developer Utilities
Mass percent to molality calculator
w/w % + MM → mol/kg, free
POST /chem/mass-percent-to-molality$0.002Developer Utilities
Mass percent to ppm converter
% w/w → ppm & ppb, free
POST /chem/mass-percent-to-ppm$0.002Developer Utilities
Mass to gas volume calculator
V = mRT/(MP) ideal gas, free
POST /chem/mass-to-gas-volume$0.002Developer Utilities
Mass-to-mass stoichiometry calculator
product mass from reactant, free
POST /chem/mass-to-mass-stoich$0.002Developer Utilities
mg/L to molarity calculator
concentration + molar mass → mol/L, free
POST /chem/mg-per-liter-to-molarity$0.002Developer Utilities
Molar concentration calculator
c = n/V in mol/L, free
POST /chem/molar-concentration$0.002Developer Utilities
Molar mass from boiling point elevation
M = Kb·g / (ΔTb·kg), free
POST /chem/molar-mass-from-bp-elevation$0.002Developer Utilities
Molar mass from gas density calculator
M = ρRT/P (ideal gas), free
POST /chem/molar-mass-from-gas-density$0.002Developer Utilities
Molarity from moles and volume calculator
M = n/V in mol/L, free
POST /chem/molarity-from-moles-volume$0.002Developer Utilities
Molarity to molality calculator
M, density, MM → mol/kg, free
POST /chem/molarity-to-molality$0.002Developer Utilities
Mole fraction to mass percent calculator
free binary conversion
POST /chem/mole-fraction-to-mass-percent$0.002Developer Utilities
Osmolarity calculator
Osm = i·M in osmoles per liter, free
POST /chem/osmolarity$0.002Developer Utilities
Oxygen for combustion calculator
moles O₂ for CₓHᵧ hydrocarbon, free
POST /chem/oxygen-required-combustion$0.002Developer Utilities
Particles to moles calculator
n = N / N_A, free
POST /chem/particles-to-moles$0.002Developer Utilities
Percent composition calculator
mass % from formula, free
POST /chem/percent-composition$0.002Developer Utilities
Percent to molarity calculator
mass % + density → mol/L, free
POST /chem/percent-to-molarity$0.002Developer Utilities
Percent water in hydrate calculator
mass % H₂O from hydrate &, free
POST /chem/percent-water-in-hydrate$0.002Developer Utilities
Strong acid pH calculator
pH = −log₁₀(C) monoprotic, free
POST /chem/ph-strong-acid$0.002Developer Utilities
PPB concentration calculator
parts per billion by mass, free
POST /chem/ppb-concentration$0.002Developer Utilities
PPM from molarity calculator
M, molar mass, density → ppm, free
POST /chem/ppm-from-molarity$0.002Developer Utilities
Equilibrium direction predictor
Q vs K shift direction, free
POST /chem/q-vs-k-direction$0.002Developer Utilities
Rate constant from half-life calculator
k = ln(2)/t½, free
POST /chem/rate-constant-from-half-life$0.002Developer Utilities
Graham's law calculator
relative effusion rate √(M₂/M₁), free
POST /chem/rate-of-effusion$0.002Developer Utilities
Reaction order from rate data calculator
n = log(r₁/r₂)/log(c₁/c₂), free
POST /chem/reaction-order-from-rates$0.002Developer Utilities
Solution boiling point calculator
Tb = T0 + i·Kb·m, free
POST /chem/solution-boiling-point$0.002Developer Utilities
Specific heat from calorimetry calculator
c = Q/(m·ΔT), free
POST /chem/specific-heat-from-calorimetry$0.002Developer Utilities
Stock solution volume calculator
V1 from C1, C2, V2 dilution, free
POST /chem/stock-solution-volume$0.002Developer Utilities
Theoretical moles of product calculator
limiting moles × mole ratio, free
POST /chem/theoretical-moles-product$0.002Developer Utilities
Theoretical yield from limiting reactant calculator
moles, free
POST /chem/theoretical-yield-from-limiting$0.002Developer Utilities
Total ion concentration calculator
C = i·M from salt molarity, free
POST /chem/total-ion-concentration$0.002Developer Utilities
Total pressure of gas mixture calculator
Dalton P = ΣPᵢ, free
POST /chem/total-pressure-gas-mixture$0.002Developer Utilities
Van der Waals pressure calculator
P = nRT/(V−nb) − an²/V², free
POST /chem/van-der-waals-pressure$0.002Developer Utilities
Vapor pressure molar mass calculator
M from relative lowering, free
POST /chem/vapor-pressure-molar-mass$0.002Developer Utilities
Volume percent calculator
% v/v from solute and solution, free
POST /chem/volume-percent$0.002Developer Utilities
Volume-to-volume gas stoichiometry calculator
V₂ from V₁ and coeffs, free
POST /chem/volume-to-volume-gas-stoich$0.002