Free Science Calculators & Lab Tools
Free, mobile-friendly chemistry and lab calculators — molarity, dilution, molar mass, ppm, concentration conversion, pH, buffers, serial dilution, normality, percent yield, and mg↔mmol. Every calculation runs in your browser; nothing you type is sent to a server.
Everyday lab calculators
Molarity Calculator
Solve M = n/V for molarity, moles, volume, or mass.
Tier 1Dilution Calculator
Solve C₁V₁ = C₂V₂ for stock and working concentrations.
Tier 1Molar Mass Calculator
Molar mass from any chemical formula using IUPAC atomic weights.
Tier 1PPM Calculator
ppm, mg/L, and % (w/v, v/v) concentration conversions.
Tier 1Alcohol Dilution Calculator
Dilute IPA or ethanol to a target % v/v and the water to add.
Tier 1Concentration Unit Converter
M, mM, µM, nM, %, ppm, mg/mL, and g/L in one conversion table.
Tier 1Advanced chemistry calculators
pH Calculator
Convert [H⁺], pH, and pOH, with a strong acid/base estimator.
Tier 2Buffer pH Calculator
Henderson–Hasselbalch for pH, pKa, [A⁻], and [HA].
Tier 2Serial Dilution Calculator
Step-by-step dilution series with concentrations and volumes.
Tier 2Normality Calculator
N = n-factor × M with a standard n-factor reference table.
Tier 2Percent Yield Calculator
Yield % = (actual ÷ theoretical) × 100.
Tier 2mg ↔ mmol Converter
Convert mg ↔ mmol and µg ↔ µmol using molar mass.
Tier 2