Use these chemistry calculators for homework and lab prep: balance a reaction, convert moles, dilute a stock, or solve an ICE table. Each tool runs in the browser and shows the formula it used.
- Reactions: balancer, redox, stoichiometry, limiting reagent, empirical formula
- Solutions: C₁V₁ dilution and molarity / mg/mL / ppm conversion
- Equilibrium and acids: Kc/Kp, Ksp, pH, phosphate and McIlvaine buffers
- Gases: PV = nRT and M = dRT/P (mm = dRT/P), plus kinetics, thermochemistry, and Nernst
Start with the Chemical Equation Balancer if you have a reaction, the Ksp Calculator for solubility-product homework, or the Phosphate Buffer Calculator for a named lab recipe. The chemistry formula sheet collects the equations in one place.
Keep the chemistry formula sheet open while you work.
Reactions & stoichiometry
- Chemical Equation Balancer & CalculatorBalance chemical equations or practice inspection balancing—a chemical equation calculator with smallest coefficients, steps, and a live atom-check table.
- Stoichiometry CalculatorCalculate molar mass and convert between moles, grams, and particles for chemical formulas.
- Limiting Reagent CalculatorFind the limiting reagent, theoretical yield, and percent yield from a balanced equation and starting amounts.
- Composition & Empirical Formula CalculatorGet mass percent composition from a formula, or find empirical and molecular formulas from percent data.
- Redox Equation BalancerBalance redox equations in acidic or basic medium with atom and charge conservation (H₂O / H⁺ / OH⁻).
Solutions & concentration
- Dilution Calculator (C₁V₁ = C₂V₂)Solve C₁V₁ = C₂V₂ for stock or diluted concentration and volume, or plan a serial dilution (HCl, H₂SO₄, 1:20, 10×, alcohol, bleach).
- Molarity & Concentration ConverterConvert concentration to molarity (M, mM, μM, nM), mg/mL, ng/mL, g/L, mass percent, % w/v, ppm, and molality using molar mass and density.
Equilibrium & acids
- Chemical Equilibrium CalculatorChemical equilibrium calculator for Kc/Kp, reaction quotient Q, ICE tables, and equilibrium concentrations.
- pH CalculatorpH calculator from concentration and Ka/Kb—strong/weak acids and bases (including ammonia, Kb = 1.8×10⁻⁵), simple buffers via Henderson–Hasselbalch, and strong acid–base neutralization.
- Phosphate Buffer CalculatorPhosphate buffer calculator and citrate–phosphate (McIlvaine) mixer, plus HEPES, MES, acetate, Tris, and more—grams from target pH, concentration, and volume.
- Ksp CalculatorCalculate Ksp from molar solubility (BaCrO₄, A₃B₂, AgI…), find solubility from Ksp, and compare Q with Ksp to predict precipitation.
Energy, rates & electrochemistry
- Thermochemistry CalculatorCompute ΔH° from formation enthalpies, apply Hess’s law, run calorimetry q = mcΔT, and scale heat with moles.
- Kinetics CalculatorKinetics and rate constant calculator for half-life and integrated rate laws—solve for concentration, time, or k in zero-, first-, and second-order reactions.
- Nernst Equation CalculatorCalculate non-standard cell potential E from E°, n, and Q, plus ΔG = −nFE.