Chemistry Calculators
11 calculators spanning general, physical, analytical, and biochemistry — free, in your browser, no account required.
Page verified • Last updated: August 2026
NumCalcX has 11 chemistry calculators, several with a visual chart or diagram alongside the numeric answer. Every tool below runs entirely client-side: nothing you type is sent to a server, and there's nothing to sign up for. Click any calculator to jump straight in.
General Chemistry
Molarity & Dilution Calculator
Solution concentration, or solve a dilution problem with C₁V₁ = C₂V₂.
→Ideal Gas Law Calculator
Solve for pressure, volume, moles, or temperature with PV = nRT, with a Boyle's law chart.
→Molar Mass Calculator
Enter any chemical formula for its molar mass with a full element breakdown.
→Percent Composition Calculator
Mass percent of each element in a formula, with a composition donut chart.
→Empirical Formula Calculator
Find a compound's simplest whole-number formula from percent composition.
→Solution Density Calculator
Density, specific gravity, and mass percent concentration of a solution.
→Physical & Analytical Chemistry
pH & pOH Calculator
pH, pOH, [H⁺], and [OH⁻] from any one value, with a visual pH scale.
→Reaction Rate & Half-Life Calculator
Half-life for zero-, first-, or second-order kinetics, with a decay curve.
→Nernst Equation Calculator
A cell's actual potential under non-standard conditions from E°, n, and Q.
→Beer-Lambert Law Calculator
Solve for absorbance, molar absorptivity, concentration, or path length.
→Biochemistry
Frequently Asked Questions
Are these chemistry calculators free to use?
Yes. Every calculator on NumCalcX runs entirely in your browser — no sign-up, no account, and no data sent to a server.
Do I need to know a compound's molar mass before using these calculators?
Not necessarily — the Molar Mass Calculator computes it for you from any chemical formula, and several other calculators (like Molarity & Dilution) let you enter a molar mass directly if you already know it.
What branches of chemistry do these calculators cover?
General chemistry (molarity, gas laws, molar mass), physical chemistry (reaction kinetics, electrochemistry), analytical chemistry (spectrophotometry), and biochemistry (enzyme kinetics) are all represented.