Dilution Calculator – C1V1 = C2V2 Solver Free
This dilution calculator solves the standard dilution equation C1V1 = C2V2 for whichever value you leave blank. Enter the stock concentration, the final concentration you want and the final volume, and it tells you how much stock solution to measure and how much water or diluent to add. You can also solve for the final concentration or the final volume. Volumes work in milliliters, liters, US fluid ounces and US gallons, and concentration can be in any unit as long as both sides match, such as molarity, percent or mg/mL. It is handy for labs, cleaning solutions, plant food and hobby mixes.
Dilution Calculator
Solve C1V1 = C2V2 for any value and see how much stock and diluent to mix.
How to use the Dilution Calculator
- Choose which value to solve for.
- Enter the other three values.
- Pick the volume units for V1 and V2.
- Read the answer and the amount of diluent to add.
Dilution equation
C1 × V1 = C2 × V2. The amount of solute stays the same, so concentration times volume is equal before and after you add diluent.
Features
- Solves C1, V1, C2 or V2
- Shows how much diluent to add
- mL, L, US fl oz and US gallons
- Works with M, %, mg/mL or ppm
- Dilution factor shown
- Copy and print
Frequently asked questions
What is the dilution formula?
C1 × V1 = C2 × V2, where C1 and V1 are the stock concentration and volume, and C2 and V2 are the final concentration and volume.
How do I make 500 mL of a 0.1 M solution from a 1 M stock?
V1 = 0.1 × 500 / 1 = 50 mL. Measure 50 mL of stock and add 450 mL of water.
What units should I use for concentration?
Any unit, as long as C1 and C2 use the same one: molarity, percent, mg/mL or ppm all work.
What is a dilution factor?
It is V2 / V1, or C1 / C2. A 1:10 dilution means one part stock in ten parts total.
Can the final concentration be higher than the stock?
No. Adding diluent can only lower the concentration, so the tool warns you if C2 is greater than C1.