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⚙️ Developer UtilitiesFree
Actual yield calculator
from theoretical yield and percent yield, free
A
POST /chem/actual-yield-from-percent$0.002⚙️ Developer UtilitiesFree
Activation energy calculator
Ea from two rate constants, free
P
POST /chem/arrhenius-activation-energy$0.002⚙️ Developer UtilitiesFree
Arrhenius pre-exponential factor calculator
A from k, Ea, T, free
A
POST /chem/arrhenius-prefactor$0.002⚙️ Developer UtilitiesFree
Atom economy calculator
green chemistry AE free
A
POST /chem/atom-economy$0.002⚙️ Developer UtilitiesFree
Atoms to moles of compound calculator
n = N/(k·N_A), free
P
POST /chem/atoms-to-moles-of-compound$0.002⚙️ Developer UtilitiesFree
Average atomic mass calculator
from isotope masses and abundances
A
POST /chem/average-atomic-mass$0.002⚙️ Developer UtilitiesFree
Average kinetic energy of gas calculator
(3/2)kT per molecule, free
A
POST /chem/average-kinetic-energy-gas$0.002⚙️ Developer UtilitiesFree
Avogadro's law calculator
final gas volume from moles, free
P
POST /chem/avogadro-law$0.002⚙️ Developer UtilitiesFree
Moles to atoms calculator
Avogadro's number N = n·N_A, free
P
POST /chem/avogadro-number$0.002⚙️ Developer UtilitiesFree
Bomb calorimeter calculator
molar heat of combustion from C, ΔT, n
A
POST /chem/bomb-calorimetry$0.002⚙️ Developer UtilitiesFree
Bond energy reaction enthalpy calculator
ΔH from bonds
A
POST /chem/bond-enthalpy-reaction$0.002⚙️ Developer UtilitiesFree
Boyle's law calculator
final gas pressure from volume, free
P
POST /chem/boyle-final-pressure$0.002⚙️ Developer UtilitiesFree
Boyle's law final volume calculator
V2 from P1, V1, P2 at constant T, free
A
POST /chem/boyle-final-volume$0.002⚙️ Developer UtilitiesFree
Buffer capacity calculator
β from acid and conjugate base, free
P
POST /chem/buffer-capacity$0.002⚙️ Developer UtilitiesFree
Buffer pOH calculator
pOH from pKb and concentrations, free
A
POST /chem/buffer-poh$0.002⚙️ Developer UtilitiesFree
C1V1 = C2V2 calculator
solve dilution for concentration or volume, free
P
POST /chem/c1v1-c2v2$0.002⚙️ Developer UtilitiesFree
Calorimeter constant calculator
C = q/ΔT from heat and temperature change
P
POST /chem/calorimeter-constant$0.002⚙️ Developer UtilitiesFree
Calorimetry heat released calculator
Q = m·c·ΔT from mass, specific heat and ΔT, free
A
POST /chem/calorimetry-heat$0.002⚙️ Developer UtilitiesFree
Catalyst rate enhancement calculator
k_cat/k_uncat from Ea, free
A
POST /chem/catalyst-rate-enhancement$0.002⚙️ Developer UtilitiesFree
Cell potential from Gibbs free energy
E° = −ΔG°/(nF)
P
POST /chem/cell-potential-from-gibbs$0.002⚙️ Developer UtilitiesFree
Charles law final temperature calculator
T2 from V1, T1, V2 free
A
POST /chem/charles-final-temperature$0.002⚙️ Developer UtilitiesFree
Clausius–Clapeyron calculator
T2 from two vapor pressures, free
P
POST /chem/clausius-clapeyron$0.002⚙️ Developer UtilitiesFree
Colligative particle concentration calculator
M×i effective particles, free
A
POST /chem/colligative-particle-count$0.002⚙️ Developer UtilitiesFree
Collision theory rate calculator
k = p·Z·e^(−Ea/RT), free
P
POST /chem/collision-frequency-factor$0.002⚙️ Developer UtilitiesFree
Combined equilibrium constant calculator
overall K from steps, free
A
POST /chem/combined-equilibrium-constant$0.002⚙️ Developer UtilitiesFree
Combined gas law final pressure calculator
P2 from V2, T2 free
A
POST /chem/combined-gas-final-pressure$0.002⚙️ Developer UtilitiesFree
Combustion analysis calculator
empirical formula from CO2 and H2O, free
A
POST /chem/combustion-analysis$0.002⚙️ Developer UtilitiesFree
Common ion effect solubility calculator
reduced molar solubility from Ksp, free
P
POST /chem/common-ion-solubility$0.002⚙️ Developer UtilitiesFree
Gas compressibility factor calculator
Z = PVm/RT for real gases, free
A
POST /chem/compressibility-factor$0.002⚙️ Developer UtilitiesFree
Concentration after evaporation calculator
concentrated solution from volume lost, free
P
POST /chem/concentration-after-evaporation$0.002⚙️ Developer UtilitiesFree
Conjugate base to acid ratio calculator
[A−]/[HA] from pH and pKa, free
P
POST /chem/conjugate-ratio$0.002⚙️ Developer UtilitiesFree
Faraday corrosion rate calculator
penetration rate from i_corr, free
P
POST /chem/corrosion-rate-faraday$0.002⚙️ Developer UtilitiesFree
Van der Waals critical constants calculator
Tc, Pc, Vc from a and b, free
A
POST /chem/critical-constants$0.002⚙️ Developer UtilitiesFree
Partial pressures from mole amounts
Dalton Pi=(ni/n)·P, free
A
POST /chem/dalton-from-moles$0.002⚙️ Developer UtilitiesFree
Gas mole fraction from partial pressure
Dalton yi=Pi/P, free
A
POST /chem/dalton-mole-fraction$0.002⚙️ Developer UtilitiesFree
Degree of dissociation calculator
α from C₀ and Ceq, free
A
POST /chem/degree-of-dissociation$0.002⚙️ Developer UtilitiesFree
Density calculator
ρ=m/V from mass and volume, free
A
POST /chem/density-mass-volume$0.002⚙️ Developer UtilitiesFree
Dilution calculator
solve M1V1=M2V2 for concentration or volume
A
POST /chem/dilution$0.002⚙️ Developer UtilitiesFree
Dilution factor calculator
DF and fold dilution from volumes
A
POST /chem/dilution-factor-from-volumes$0.002⚙️ Developer UtilitiesFree
pH after dilution calculator
strong acid pH from volumes, free
P
POST /chem/dilution-ph-strong-acid$0.002⚙️ Developer UtilitiesFree
Dilution to target ppm calculator
stock volume for a final ppm
A
POST /chem/dilution-to-target-ppm$0.002⚙️ Developer UtilitiesFree
Dilution water to add calculator
volume from C1 V1 C2 free
A
POST /chem/dilution-water-added$0.002⚙️ Developer UtilitiesFree
Ebullioscopic constant calculator
Kb from ΔTb, molality and van't Hoff factor
P
POST /chem/ebullioscopic-constant$0.002⚙️ Developer UtilitiesFree
Electrode potential vs pH calculator
hydrogen electrode Nernst, free
P
POST /chem/electrode-potential-ph$0.002⚙️ Developer UtilitiesFree
Electrolysis time calculator
time to deposit mass from I, m, M, n, free
A
POST /chem/electrolysis-time$0.002⚙️ Developer UtilitiesFree
Electron configuration calculator
ground-state config and valence electrons from atomic number, free
A
POST /chem/electron-configuration$0.002⚙️ Developer UtilitiesFree
Electrorefining efficiency calculator
current efficiency from actual vs theoretical mass, free
A
POST /chem/electrorefining-efficiency$0.002⚙️ Developer UtilitiesFree
Empirical formula calculator
from mass or percent composition
A
POST /chem/empirical-formula$0.002⚙️ Developer UtilitiesFree
Empirical formula from masses calculator
ratio from mass and atomic mass
A
POST /chem/empirical-from-masses$0.002⚙️ Developer UtilitiesFree
Reaction heat for amount calculator
Q = n·ΔH from moles and molar enthalpy, free
A
POST /chem/enthalpy-amount-scaling$0.002⚙️ Developer UtilitiesFree
Enthalpy scaled by coefficients calculator
ΔH × factor for thermochemical equations, free
A
POST /chem/enthalpy-coefficient-scaling$0.002⚙️ Developer UtilitiesFree
Heat of combustion per gram calculator
energy from molar ΔH and molar mass
P
POST /chem/enthalpy-combustion-per-gram$0.002⚙️ Developer UtilitiesFree
Enthalpy of dilution calculator
molar ΔH_dil = q/n from heat and moles, free
A
POST /chem/enthalpy-dilution$0.002⚙️ Developer UtilitiesFree
Enthalpy from heats of formation calculator
ΔH°_rxn free
A
POST /chem/enthalpy-from-formation$0.002⚙️ Developer UtilitiesFree
Enthalpy from internal energy calculator
ΔH = ΔU + Δn_g RT
A
POST /chem/enthalpy-from-internal-energy$0.002⚙️ Developer UtilitiesFree
Enthalpy of fusion calculator
ΔH_fus from heat and moles
A
POST /chem/enthalpy-of-fusion-moles$0.002⚙️ Developer UtilitiesFree
Enthalpy of vaporization calculator
molar ΔH_vap = q/n from heat and moles, free
A
POST /chem/enthalpy-of-vaporization-moles$0.002⚙️ Developer UtilitiesFree
Enthalpy of reaction calculator
ΔH from formation enthalpies
A
POST /chem/enthalpy-reaction$0.002⚙️ Developer UtilitiesFree
Reaction entropy change calculator
ΔS from standard molar entropies
A
POST /chem/entropy-of-reaction$0.002⚙️ Developer UtilitiesFree
Equilibrium constant calculator
Kc from concentrations, free
A
POST /chem/equilibrium-constant$0.002No capabilities match your search.
How it works
1
Get your key
Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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$0.002+
The full API — 7500+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
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