Pick the value you need, fill in the other three, and C₁V₁ = C₂V₂ does the rest. Great for making stock solutions or PBS / buffer dilutions.
Solve for C₁, V₁, C₂ or V₂ — just pick the unknown.
M / mM / μM / nM and μL / mL / L convert automatically.
Never lets you request a negative stock volume when C₂ > C₁.
See the rearranged formula with every number substituted.
Molarity and concentration problems share the same logic.
Molarity Calculator