Selleck Calculator for Drug Concentration and Dilution

How to Use the Calculator

1. Enter the initial concentration (C₁) of your drug solution in mg/mL or g/L.
2. Enter the initial volume (V₁) of your drug solution in mL or L.
3. Enter the final volume (V₂) you want to achieve in mL or L.
4. Click the "Calculate" button to determine the final concentration (C₂) and dilution factor.
5. The calculator uses the formula: C₂ = C₁ × (V₁ / V₂)

Example Usage

If you have a 10 mg/mL stock solution (C₁) and you want to prepare 50 mL (V₂) of a 2 mg/mL working solution (C₂), you need to calculate:

Initial Volume (V₁) = (C₂ × V₂) / C₁ = (2 mg/mL × 50 mL) / 10 mg/mL = 10 mL

So, you would need to dilute 10 mL of the stock solution to a final volume of 50 mL with appropriate diluent.

Principle of Calculation

This calculator is based on the principle of conservation of mass. The amount of drug in the initial solution equals the amount of drug in the final solution:

Amount of drug = C₁ × V₁ = C₂ × V₂

Therefore, the final concentration can be calculated as C₂ = C₁ × (V₁ / V₂).