๐งชSerial Dilution Calculator
Plan a dilution series, solve for the required factor, or back-calculate CFU/mL from plated colonies.
Runs entirely in your browser. No data is sent to a server.
Free Serial Dilution Calculator
Setting up a dilution series for lab work? Our free serial dilution calculator does the math for you. Enter your starting concentration, dilution factor, and number of steps, and get a full table showing exactly how much stock and diluent to use at every tube โ plus the resulting concentration after each step.
Need equal log-steps to hit a specific target concentration? Switch to solve-for-factor mode and the calculator works out the right dilution factor automatically. Microbiology users get a dedicated CFU/mL mode: enter your plated colony count, dilution factor, and volume plated, and back-calculate the original bacterial concentration instantly.
A simple visual diagram shows the full dilution chain so you can double-check your setup before you're at the bench. No sign-up, no downloads โ just accurate dilution math whenever you need it. See the About page or the FAQ for more.