GlenCalc

Dilution calculator

Works for any concentration unit (%, mol/L, ppm) as long as both use the same one, from lab solutions to cleaning concentrates.

Your answer

Stock to use V₁125 mL
Add water or diluent375 mL
Dilution ratio1 : 3 (stock : diluent)

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How we worked it out

Updated as you change the numbers.

  1. V₁ = C₂ × V₂ ÷ C₁. Diluent = V₂ − V₁.

Method and assumptions

The amount of solute stays the same, so concentration × volume is conserved. Add acids to water, not water to acids.

Questions

How do I make 500 mL of 3% from 12% stock?

125 mL of stock plus 375 mL of water.

Sources

Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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