Dilution & Molarity Calculator
Bench calculators for preparing solutions. Use C₁V₁=C₂V₂ to work out how much stock and diluent to combine, or the molarity calculator to convert between mass, molecular weight, volume and concentration.
Prepare a diluted solution
Use the same concentration unit for C₁ and C₂ (e.g. M, mg/mL, %).
For lab reference — always confirm against your protocol. Computed locally in your browser.
The formulas
C₁ × V₁ = C₂ × V₂ → V₁ = (C₂ × V₂) / C₁M = mass(g) / MW(g/mol) / volume(L)Frequently asked questions
How does the C₁V₁ = C₂V₂ dilution formula work?+
Concentration × volume is conserved on dilution. To reach a final concentration C₂ in volume V₂ from stock C₁, take V₁ = (C₂ × V₂) ÷ C₁ of stock and add diluent up to V₂. Use the same concentration unit for C₁ and C₂.
How do I calculate molarity?+
Molarity (mol/L) = mass (g) ÷ molecular weight (g/mol) ÷ volume (L). This tool can also solve the reverse — the mass to weigh out for a target molarity, MW and volume.
What concentration units can I use for dilution?+
Any, as long as C₁ and C₂ share the same unit — molar (M), mg/mL, %, X-fold, etc. The result volumes are in whatever volume unit you pick.
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