Dilution Calculator
Calculate founder equity dilution across seed, Series A, B, C rounds and option pools. Enter values for instant results with step-by-step formulas.
Reviewed by Daniel Agrici, Founder & Lead Developer
Formula
C₁V₁ = C₂V₂
The dilution equation. Concentration × Volume before = Concentration × Volume after. Enter any 3 values to find the 4th.
Worked Examples
Example 1: Dilute 10M to 2M
Problem:C₁=10M, want C₂=2M, final V₂=100mL
Solution:V₁ = 2×100/10 = 20mL. Take 20mL stock, add 80mL water.
Result:Use 20mL stock + 80mL water
Frequently Asked Questions
How does the dilution formula work?
The dilution formula is C1V1 = C2V2, where C is concentration and V is volume. If you have 100 mL of 2M HCl and need 0.5M, solve: 2 x 100 = 0.5 x V2, so V2 = 400 mL total volume. Add 300 mL of water to 100 mL of stock solution. Always add acid to water, never the reverse.
Reviewed by Daniel Agrici, Founder & Lead Developer · Editorial policy