Serial Dilution Final Concentration
Calculator
Results
- Final concentration (mmol/L)
- 0.0001
- Final concentration (µmol/L)
- 0.1
- Total dilution factor
- 100,000
Biology and lab results
| Final concentration (mmol/L) | 0.0001 |
| Final concentration (µmol/L) | 0.1 |
| Total dilution factor | 100,000 |
formula-map diagram
- Final concentration (mmol/L)
- 0.0001
- Final concentration (µmol/L)
- 0.1
- Total dilution factor
- 100,000
Formula breakdown
Formula
C_n = C₀ ÷ DF^n= 0.0001
Note
Simplified model: these results use standard textbook laboratory relationships and average constants (A260 = 1 for 50 µg/mL dsDNA, 617.96 g/mol per base pair, ~110 Da per amino acid, ideal exponential growth). Real samples vary with purity, contaminants, buffer, temperature and instrument calibration. Always confirm against your own standards and protocol; do not use for diagnostic or safety-critical work.
More in Biology and lab
See all →Frequently asked questions
How does a serial dilution reduce concentration so quickly?+
Each step multiplies the previous dilution factor rather than adding to it, so after n steps of factor f each, the overall dilution is f raised to the power n. This is why just a few 1:10 steps can take a concentrated stock down to parts-per-million or lower.
What inputs does the calculator need?+
You provide the starting concentration, the dilution factor used at each step (e.g. 10 for a 1:10 series), and the number of steps performed. It then returns the concentration remaining after the final step.
Do all steps need to use the same dilution factor?+
This calculator assumes a constant factor at every step, which is the standard setup for calibration curves and colony-count dilutions. If your series mixes different factors, calculate each step separately and multiply the factors together instead.
Why is my final concentration not exactly what I expected?+
Small pipetting errors compound at every step, so a series with many steps amplifies even minor volume inaccuracies. Using wide-bore or poorly calibrated pipettes for the smaller volumes is the most common source of drift in serial dilutions.
How do I choose the number of steps for a target concentration?+
Work backward: divide the starting concentration by the desired final concentration to get the total fold-dilution needed, then take the logarithm of that number base your chosen per-step factor to find how many steps are required. The calculator can be used iteratively to check that a given step count lands close enough to your target.