Chemical Calculators

Fill in any three of absorbance, absorptivity, path length, and concentration. You also get percent transmittance and a calibration line.

Find a solution's boiling point rise using molality or solute mass, molar mass and solvent mass. Set the solvent and van't Hoff factor to see the new boiling point.

Enter an unbalanced chemical equation to find its coefficients. Follow the solution steps and compare atom counts on both sides.

Calculate corrected calcium level adjusted for albumin with multiple formulas (Payne, modified), clinical interpretation, visual calcium distribution diagram, and step-by-step calculation breakdown.

Enter measured sodium and glucose. Get hyperglycemia-corrected sodium from the Katz and Hillier formulas.

Enter any three of stock concentration, stock volume, final concentration and final volume to solve the missing one with M₁V₁ = M₂V₂.

Enter an element or ion to get full and noble-gas configurations, an orbital diagram, unpaired electrons and paramagnetic or diamagnetic character.

Find a compound's empirical formula from element masses or percentages, with calculation steps. Add molar mass to also find its molecular formula.

Calculate freezing point depression from molality and the cryoscopic constant. Includes a solvent library with real Kf data for water, benzene, cyclohexane and camphor, a van't Hoff factor for ionic solutes and an animated thermometer.

Calculate buffer pH from pKa and the conjugate base to weak acid ratio. Works three ways: find the pH, find the ratio and recipe needed to hit a target pH, or back-calculate pKa from a measured pH, with a buffer-capacity gauge.

Search by name, symbol, or number, or recolor all 118 elements by a property such as radius, density, or electronegativity, then open one element's data.

Enter a balanced equation and each reactant in grams or moles. See which reactant runs out, the excess left, and the theoretical yield.

Calculate molality from moles of solute and mass of solvent, or from grams and molar mass. See the result on an animated beaker, then watch how molality drives freezing-point depression and boiling-point elevation on a temperature bar.

Calculate molar mass in g/mol from a formula such as H2O or Ca(OH)2. See each element's contribution and the calculation steps.

Enter values to solve for molarity, solute mass, or solution volume. Or enter the initial and final molarity and volume for a dilution.

Enter a substance, molar mass, and input value to convert between moles, grams, and particles with full formulas and step-by-step solutions.

Enter the standard potential, electrons transferred, temperature, and reaction quotient. Get the cell voltage, Gibbs free energy, and K.

Calculate the normality of a solution from equivalents and volume, or straight from grams using molar mass and n-factor. Converts between normality and molarity through the equivalence factor, with n-factor presets for common acids.

π = iMRT; Osmolarity comparison (mOsm/L).

Calculate the percent composition of any compound - the mass percent of every element. Enter a formula like H2O, C6H12O6 or CuSO4.5H2O for the molar mass, a per-element table and a comparison by mass versus by atom count.

Enter actual yield and theoretical yield, or leave one unknown, to get the percent yield of a reaction.

Calculate pH values from hydrogen ion concentration [H+], pOH, or scientific notation with interactive pH scale visualization and detailed step-by-step calculations.

Enter pKa, Ka, pKb or Kb to calculate the other three values for a conjugate acid-base pair. Adjust pKw or use the default 14.00 at 25°C.

Convert between moles, mass, and volume in chemical reactions using balanced equations, molar ratios, and molar masses. Get step-by-step stoichiometric solutions.

Enter a balanced equation, the product, and how much of each reactant you have to get the theoretical yield and see which reactant runs out first.

Enter titrant and analyte volumes and known concentrations to calculate the unknown molarity, equivalence-point pH, and recommended chemical indicator.