Dilution Calculator (C1V1 = C2V2)
Find how much stock solution you need for a target concentration.
mL
How it works
C1 × V1 = C2 × V2. Solve for V1 = C2 × V2 ÷ C1, then top up with solvent to the final volume. Keep concentration units the same on both sides. The target must be lower than the stock. Example: with the default values, stock volume needed comes to 12.5.
FAQ
Is this calculator free?
Yes. No signup is needed and nothing you enter is stored.
Is the result exact?
Results are rounded for display. For financial, medical, or legal decisions, confirm with a professional.
Do my numbers leave my device?
No. The calculation runs in your browser.