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Centrifuge Sample Capacity Estimator

The Centrifuge Sample Capacity Estimator calculates how many sample positions and how much sample volume can be processed across a chosen number of centrifuge runs. It is designed for planning batch work when rotor capacity, usable sample volume per tube, and planned run count are known.

The main result is the total number of sample positions processed. A second result estimates the associated sample volume, which is useful for scheduling, aliquot planning, and checking whether the planned run sequence can cover a sample set. The calculation assumes each planned position is usable; rotor balance requirements and tube-specific fill limits still need to be handled according to the instrument and rotor instructions.

Rotor and run plan

positions
mL
runs
Result
—
Total sample positions
Volume per run—
Total sample volume—
Positions per run—

1. Enter usable rotor positions
Count only positions you can actually load for the planned configuration.

2. Enter sample volume per tube
Use the working sample volume, not simply the tube manufacturer’s nominal capacity.

3. Set the number of runs
Enter the number of complete centrifuge cycles planned for the batch.

4. Review total sample positions
This is the number of individual loaded positions available across all runs.

5. Check volume capacity
Use the per-run and total volume estimates to compare the plan with your sample inventory.

Total sample positions = Usable rotor positions × Planned runs
Volume per run = Usable rotor positions × Sample volume per tube
Total sample volume = Total sample positions × Sample volume per tube

Where:

  • Usable rotor positions = loadable positions per run
  • Sample volume per tube = working liquid volume in mL
  • Planned runs = number of centrifuge cycles

Assumptions: Every counted position is assumed to be loaded with the same sample volume. Instrument-specific balance, adapter, and tube limits are not modeled.

What the result means

Five fully loaded runs can handle 90 tubes at the specified working volume.

Use the result as a planning or calculation aid and confirm protocol-specific assumptions before laboratory use.

Given

  • Usable rotor positions = 18
  • Sample volume per tube = 12 mL
  • Planned runs = 5

Calculation
Total positions = 18 × 5 = 90
Volume per run = 18 × 12 = 216 mL
Total sample volume = 90 × 12 = 1,080 mL

Result
90 sample positions and 1,080 mL total volume.

Interpretation
Five fully loaded runs can handle 90 tubes at the specified working volume.

Should I count empty balance tubes as sample positions?

No. Enter only positions that will contain samples if the goal is sample capacity. Balance tubes may occupy rotor positions without increasing sample throughput.

Can sample volume exceed the tube size?

No. Use a working volume that is permitted for the tube, adapter, rotor, and spin conditions.

Does the calculator account for paired loading rules?

No. Enter a usable position count that already reflects any symmetry or balancing restrictions for your rotor.

What if some tubes have different fill volumes?

Use an average only for a rough volume estimate. For precise planning, calculate groups of equal-volume tubes separately.

Is total volume the same as centrifuge chamber capacity?

No. It is the sum of liquid in the sample tubes, not the physical chamber or bucket volume.