The DNA Concentration Dilution Factor Estimator calculates the fold dilution required to reduce a DNA stock from a starting concentration to a lower target concentration. When a final preparation volume is also supplied, it converts that factor into the DNA-stock volume and diluent volume needed for the mixture.
This is useful when normalizing extracts, preparing working stocks, or matching several DNA samples to a common concentration. The dilution factor is dimensionless, while the stock and diluent volumes use the final-volume unit entered on the page. The estimator assumes a direct one-step dilution and does not model DNA loss during transfer or adsorption.
This also makes it convenient to compare several normalization plans because the fold factor stays the same even when you change the requested final preparation volume.
1. Enter starting concentration
Use the current DNA concentration before dilution.
2. Enter target concentration
Set the lower concentration required for the working sample.
3. Enter desired final volume
Specify how much diluted DNA solution you want in total.
4. Review the mixing plan
The main result is the fold dilution; the details provide stock and diluent volumes for that final volume.
Formula:
Dilution factor = Starting concentration ÷ Target concentration Stock volume = Final volume ÷ Dilution factor Diluent volume = Final volume − Stock volumeThis one-step model requires the target concentration to be less than or equal to the starting concentration.
The result shows how many times the starting DNA concentration is reduced to reach the target.
For very large dilution factors, a serial dilution may be easier to pipette accurately than one very small stock aliquot.
Given: A DNA stock is 180 ng/µL, the target is 30 ng/µL, and 90 µL of working solution is needed.
Calculation:
Dilution factor = 180 ÷ 30 = 6×.
Stock volume = 90 ÷ 6 = 15 µL.
Diluent volume = 90 − 15 = 75 µL.
Result: A 6× dilution using 15 µL stock and 75 µL diluent.
The 90 µL mixture has the target concentration of 30 ng/µL under ideal mixing.
Yes. The dilution factor will be 1×, the stock volume will equal the final volume, and no diluent is required.
That is a concentration step rather than a dilution. This estimator will reject that input because adding diluent cannot raise concentration.
The calculator does not choose a buffer or solvent. Use the diluent required by your downstream protocol and sample chemistry.
This page provides a single-step dilution. You can divide a large overall factor into several smaller steps while keeping the product of the step factors equal to the desired total factor.
In the ideal calculation, no DNA mass is lost; dilution changes concentration by increasing volume. Real handling losses are outside the model.