How to use this calculator
- Enter the total usable starting volume.
- Set the full volume required for one sample.
- Add a realistic dead-volume percentage.
- Enter the replicate count and calculate whole-sample capacity.
#3273 · Science & Engineering Tool
RNA Concentration Sample Capacity Calculator
Plan how many RNA samples can be prepared from a limited volume after reserving a dead-volume allowance. The calculator returns the maximum count of complete samples, the number of complete replicate sets, and the unused remainder. It floors capacity to whole samples so the plan never assumes a partial aliquot.
Calculator
Laboratory inputsFormula
Usable volume = total volume × (1 − dead volume %)
Sample capacity = floor(usable volume ÷ volume per sample)
Sample capacity = floor(usable volume ÷ volume per sample)
Complete conditions equal floor(sample capacity ÷ replicates per condition).
What the result means
The main result is the maximum number of full-volume samples available after the stated allowance. Actual yield may be lower if transfers, mixing, or container geometry create additional loss.
Capacity planning is volumetric only. It does not verify whether concentration, sterility, viability, or assay-specific minimums are adequate.
Example calculation
From 1,200 µL with a 10% allowance, 1,080 µL is usable. At 25 µL per sample, capacity is 43 complete samples. With three replicates per condition, that supports 14 complete conditions and leaves 5 µL after 43 aliquots.
Tips for better results
- Use validated dead-volume information for the actual vessel.
- Include controls in the planned sample count.
- Round capacity down, never up.
- Account for multichannel or robotic priming separately when relevant.
- Confirm minimum recoverable volume experimentally.
Frequently asked questions
Why is sample capacity rounded down?
A partial remaining volume cannot supply a complete sample at the requested volume.
Does dead volume include pipetting loss?
It can, provided you choose an allowance that represents both vessel hold-up and expected handling loss.
Are controls included automatically?
No. Subtract required controls from the displayed capacity when planning experimental samples.
How are replicate sets counted?
The sample capacity is divided by replicates per condition and rounded down to a whole number of complete sets.
Can I use milliliters instead of microliters?
Yes, if total volume and volume per sample use the same unit; the displayed labels assume µL.
Related calculators
Capacity planning inputs
| Input | Unit | Effect |
|---|---|---|
| Total volume | µL | Starting inventory |
| Per-sample volume | µL | Consumption per aliquot |
| Dead volume | % | Reserved handling loss |
| Replicates | count | Samples in a complete condition |