Fill in the details and click Calculate to see your results.
Diluting a solution adds solvent but not solute, so concentration × volume stays the same: C₁V₁ = C₂V₂ (written M₁V₁ = M₂V₂ for molarity). Choose what you want to find and enter the other three values.
The concentrations can be in any unit — molarity, percent or mg/mL — as long as C₁ and C₂ use the same one. The calculator also tells you how much solvent to add.
| Find | Volume of stock needed (V₁) |
| Stock concentration (C₁) | 1 |
| Final concentration (C₂) | 0.1 |
| Final volume (V₂) | 100 mL |
| Stock volume V₁ (mL) | 10 |
| Stock concentration C₁ | 1 |
| Final concentration C₂ | 0.1 |
| Final volume V₂ (mL) | 100 |
| Solvent to add (mL) | 90 |
Take 10 mL of the stock and add 90 mL of water.
Try this example →| Find | Final concentration (C₂) |
| Stock concentration (C₁) | 2 |
| Volume of stock (V₁) | 25 mL |
| Final volume (V₂) | 500 mL |
| Stock volume V₁ (mL) | 25 |
| Stock concentration C₁ | 2 |
| Final concentration C₂ | 0.1 |
| Final volume V₂ (mL) | 500 |
| Solvent to add (mL) | 475 |
The new concentration is 0.1 M.
Try this example →When diluting a concentrated acid, always add the acid slowly to the water, never water to the acid. The heat released can make water boil and spit if it is added to concentrated acid.
C₁V₁ = C₂V₂ (or M₁V₁ = M₂V₂ for molarity).
No. Use any volume unit as long as V₁ and V₂ match.
V₂ ÷ V₁ (or C₁ ÷ C₂). Diluting 10 mL to 100 mL is a 10× dilution.
V₂ − V₁. For 10 mL of stock made up to 100 mL, add 90 mL.