Free Online Chemistry Calculators
Calculate chemical amounts, solution concentrations, gas relationships and ideal equilibria with online chemistry tools and explicit model assumptions.
Choose the right tool
Distinguish molarity from molality, solution mass from solvent mass, and actual yield from atom economy. Supply balanced reaction coefficients and temperature-appropriate constants. Equilibrium tools state when they use dimensionless activities or textbook concentration conventions.
Available tools
- Chemical Formula Molar Mass Calculator
Use this online chemical formula molar mass calculator with labeled inputs and a worked example. M = Σ(atomic weight × atom count).
- Element Mass Percent Composition Calculator
Use this online element mass percent composition calculator with labeled inputs and a worked example. element mass % = element mass contribution / molar mass × 100.
- Atoms in a Chemical Sample Calculator
Use this online atoms in a chemical sample calculator with labeled inputs and a worked example. atoms of element = stoichiometric count × moles × NA.
- Mass to Moles Calculator
Use this online mass to moles calculator with labeled inputs and a worked example. n = m/M.
- Moles to Particles Calculator
Use this online moles to particles calculator with labeled inputs and a worked example. N = n NA.
- Solution Molarity Calculator
Use this online solution molarity calculator with labeled inputs and a worked example. c = n/Vsolution.
- Solution Dilution Volume Calculator
Use this online solution dilution volume calculator with labeled inputs and a worked example. C₁V₁ = C₂V₂.
- Molality Calculator
Use this online molality calculator with labeled inputs and a worked example. b = nsolute/msolvent.
- Mixture Mole Fraction Calculator
Use this online mixture mole fraction calculator with labeled inputs and a worked example. xi = ni/Σnj.
- Solution Mass Percent Calculator
Use this online solution mass percent calculator with labeled inputs and a worked example. w/w % = msolute/msolution × 100.
- Solution Volume Percent Calculator
Use this online solution volume percent calculator with labeled inputs and a worked example. v/v % = Vsolute/Vsolution × 100.
- Mass Fraction Parts Per Million Calculator
Use this online mass fraction parts per million calculator with labeled inputs and a worked example. ppm = mass fraction × 10⁶; ppb = mass fraction × 10⁹.
- Molarity to Milligrams Per Liter Calculator
Use this online molarity to milligrams per liter calculator with labeled inputs and a worked example. mg/L = mol/L × g/mol × 1000.
- Reaction Specific Normality Calculator
Use this online reaction specific normality calculator with labeled inputs and a worked example. N = M × equivalence factor.
- Chemical Equivalent Weight Calculator
Use this online chemical equivalent weight calculator with labeled inputs and a worked example. equivalent weight = molar mass / equivalence factor.
- Balanced Equation Mole Ratio Calculator
Use this online balanced equation mole ratio calculator with labeled inputs and a worked example. ntarget = nknown × νtarget/νknown.
- Limiting Reactant Extent Calculator
Use this online limiting reactant extent calculator with labeled inputs and a worked example. extent = min(ni/νi); remainder = ni − extent νi.
- Theoretical Product Yield Calculator
Use this online theoretical product yield calculator with labeled inputs and a worked example. mproduct = reaction extent × νproduct × Mproduct.
- Chemical Percent Yield Calculator
Use this online chemical percent yield calculator with labeled inputs and a worked example. yield % = actual/theoretical × 100.
- Reaction Atom Economy Calculator
Use this online reaction atom economy calculator with labeled inputs and a worked example. atom economy % = desired stoichiometric product mass / total stoichiometric reactant mass × 100.
- Empirical Formula Ratio Calculator
Use this online empirical formula ratio calculator with labeled inputs and a worked example. Convert elemental masses to moles, divide by smallest, then find small whole-number ratios.
- Molecular Formula from Empirical Formula Calculator
Use this online molecular formula from empirical formula calculator with labeled inputs and a worked example. multiplier = molecular molar mass / empirical molar mass.
- Ideal Gas Volume Calculator
Use this online ideal gas volume calculator with labeled inputs and a worked example. V = nRT/P.
- Ideal Gas Molar Volume Calculator
Use this online ideal gas molar volume calculator with labeled inputs and a worked example. Vm = RT/P.
- Ideal Gas Density Calculator
Use this online ideal gas density calculator with labeled inputs and a worked example. ρ = PM/(RT).
- Dalton Partial Pressure Calculator
Use this online dalton partial pressure calculator with labeled inputs and a worked example. Pi = xi Ptotal.
- Graham Effusion Rate Ratio Calculator
Use this online graham effusion rate ratio calculator with labeled inputs and a worked example. r₁/r₂ = √(M₂/M₁).
- Boyle Law Final Volume Calculator
Use this online boyle law final volume calculator with labeled inputs and a worked example. V₂ = P₁V₁/P₂.
- Charles Law Final Volume Calculator
Use this online charles law final volume calculator with labeled inputs and a worked example. V₂ = V₁T₂/T₁.
- Gay Lussac Final Pressure Calculator
Use this online gay lussac final pressure calculator with labeled inputs and a worked example. P₂ = P₁T₂/T₁.
- Combined Gas Law Volume Calculator
Use this online combined gas law volume calculator with labeled inputs and a worked example. V₂ = P₁V₁T₂/(P₂T₁).
- Van Der Waals Gas Pressure Calculator
Use this online van der waals gas pressure calculator with labeled inputs and a worked example. P = nRT/(V−nb) − a(n/V)².
- Strong Monoprotic Acid pH Calculator
Use this online strong monoprotic acid ph calculator with labeled inputs and a worked example. [H⁺] = (C + √(C²+4Kw))/2; pH = −log₁₀[H⁺].
- Strong Monobasic Base pH Calculator
Use this online strong monobasic base ph calculator with labeled inputs and a worked example. [OH⁻] = (C + √(C²+4Kw))/2; pH = pKw − pOH.
- Weak Monoprotic Acid pH Calculator
Use this online weak monoprotic acid ph calculator with labeled inputs and a worked example. Solve h − Kw/h − CKa/(Ka+h) = 0.
- Weak Monobasic Base pH Calculator
Use this online weak monobasic base ph calculator with labeled inputs and a worked example. Solve b − Kw/b − CKb/(Kb+b) = 0; pH = pKw − pOH.
- Henderson Hasselbalch Buffer pH Calculator
Use this online henderson hasselbalch buffer ph calculator with labeled inputs and a worked example. pH ≈ pKa + log₁₀([A⁻]/[HA]).
- pKa to Ka Calculator
Use this online pka to ka calculator with labeled inputs and a worked example. Ka = 10^(−pKa).
- Ka to pKa Calculator
Use this online ka to pka calculator with labeled inputs and a worked example. pKa = −log₁₀ Ka.
- Neutral Water pH from pKw Calculator
Use this online neutral water ph from pkw calculator with labeled inputs and a worked example. neutral pH = pKw/2.
- Solution Ionic Strength Calculator
Use this online solution ionic strength calculator with labeled inputs and a worked example. I = ½ Σci zi².
- Binary Salt Molar Solubility from Ksp
Use this online binary salt molar solubility from ksp with labeled inputs and a worked example. Ksp = (a s)^a (b s)^b.
- Equilibrium Constant from Activities Calculator
Use this online equilibrium constant from activities calculator with labeled inputs and a worked example. K = Π aproducts^ν / Π areactants^ν.
- Reaction Quotient Direction Calculator
Use this online reaction quotient direction calculator with labeled inputs and a worked example. Compare Q = Πa^ν with K.
- Textbook Kc to Kp Calculator
Use this online textbook kc to kp calculator with labeled inputs and a worked example. Kp = Kc (RT)^Δn.
- Arrhenius Two Temperature Rate Calculator
Use this online arrhenius two temperature rate calculator with labeled inputs and a worked example. k₂ = k₁ exp[−Ea/R(1/T₂−1/T₁)].
- First Order Reaction Concentration Calculator
Use this online first order reaction concentration calculator with labeled inputs and a worked example. [A]t = [A]₀ exp(−kt); t½ = ln 2/k.
- Second Order Reaction Concentration Calculator
Use this online second order reaction concentration calculator with labeled inputs and a worked example. 1/[A]t = 1/[A]₀ + kt; t½ = 1/(k[A]₀).
- Zero Order Reaction Concentration Calculator
Use this online zero order reaction concentration calculator with labeled inputs and a worked example. [A]t = max(0, [A]₀ − kt).
- Beer Lambert Absorbance Calculator
Use this online beer lambert absorbance calculator with labeled inputs and a worked example. A = εlc; T% = 100 × 10^(−A).