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Centrifuge Dilution Factor Estimator

The Centrifuge Dilution Factor Estimator calculates the fold dilution produced when a sample, pellet resuspension, or centrifuge-derived fraction is combined with a specified volume of diluent or buffer. If you enter a measured concentration after dilution, it also back-calculates the corresponding original concentration.

Use the tool for a simple one-step volume dilution associated with centrifugation workflows, such as resuspending an aliquot before a downstream measurement. It does not model concentration or recovery caused by centrifugation itself; pelleting efficiency, supernatant removal, retained liquid, and analyte losses must be handled according to the actual procedure.

Centrifuge dilution inputs

mL
mL
units/mL
Result
—
Volume-based dilution factor
Final mixed volume—
Back-calculated original concentration—
Original sample fraction—

1. Enter the sample or fraction volume
Use the liquid volume being diluted after the centrifuge step, not the original pre-centrifugation volume unless that is truly the aliquot being mixed.

2. Enter added diluent or buffer
Use the same volume unit as the sample input.

3. Enter a diluted concentration if available
This optional numerical input is used to show the concentration corrected by the volume dilution factor.

4. Review the fold dilution
The factor is final mixed volume divided by the sample/fraction volume.

5. Separate dilution from centrifuge recovery
Do not treat this volume ratio as a correction for analyte loss, pelleting efficiency, or residual supernatant unless those effects are independently characterized.

Final volume = sample/fraction volume + diluent volume

Dilution factor = final volume / sample/fraction volume

Back-calculated original concentration = measured diluted concentration × dilution factor

Where:

  • Sample/fraction volume and diluent volume are in mL.
  • Measured diluted concentration uses the displayed units/mL.
  • Dilution factor is dimensionless.

Assumptions: Volumes are assumed additive. The calculation represents only deliberate dilution by added liquid, not recovery or concentration effects of centrifugation.

What the result means

The main result is the fold dilution caused by combining the entered liquid volumes.

If a centrifuge step changes analyte recovery or leaves an uncertain residual volume, those effects require separate measurement or modeling.

Given:

  • Recovered fraction volume = 0.8 mL
  • Added buffer = 3.2 mL
  • Measured diluted concentration = 1.6 units/mL

Calculation:
Final volume = 0.8 + 3.2 = 4.0 mL
Dilution factor = 4.0 / 0.8 = 5
Back-calculated concentration = 1.6 × 5 = 8.0 units/mL

Result:
5× dilution; back-calculated concentration = 8.0 units/mL

The fivefold correction reverses the deliberate volume dilution only; it does not correct for centrifugation losses.

Does centrifugation itself create the dilution factor used here?

No. The factor comes from the liquid volumes you deliberately combine. Centrifugation can concentrate, separate, or lose material, but those effects are not represented by this simple volume ratio.

What if there is residual supernatant around a pellet?

If that residual volume materially affects the final mixture, include it in your volume model or measure the effective volume. Ignoring it can make the calculated dilution factor too high.

Can I use microliters instead of milliliters?

Yes mathematically, provided both sample and diluent use the same unit. The page labels mL, so convert values to mL for clarity.

What happens when no diluent is added?

The factor is 1×. Under this model, the entered measured concentration is already on the same volume basis as the original sample/fraction.

How is this different from a concentration factor?

A dilution factor describes added volume relative to sample volume. A concentration factor usually compares analyte concentration before and after a concentrating step and depends on recovery as well as volume change.