Protein Per Cell Form
Enter measured protein concentration, sample volume, and counted cells. Add purity, recovery, viability, and molecular weight for deeper interpretation.
Example Data Table
This worked example shows how the calculator converts measured concentration and cell counts into protein mass per cell and estimated molecules per cell.
| Sample | Protein Conc. | Volume | Cells | Purity | Recovery | Viability | MW | Protein per Cell |
|---|---|---|---|---|---|---|---|---|
| Example Lysate | 2.8 µg/mL | 1.5 mL | 3.2 million | 92% | 88% | 95% | 52,000 Da | 1.1185 pg/cell |
| Low Yield Prep | 1.1 µg/mL | 0.8 mL | 2.4 million | 80% | 75% | 90% | 45,000 Da | 0.2444 pg/cell |
| High Density Culture | 4.5 µg/mL | 2.0 mL | 7.8 million | 96% | 93% | 97% | 68,000 Da | 1.0620 pg/cell |
Formula Used
Total protein mass = concentration × sample volume × dilution factor
Adjusted protein mass = total protein mass × purity fraction × recovery fraction
Viable cells = counted cells × viability fraction
Protein per cell = adjusted protein mass ÷ viable cells
Molecules per cell = (protein per cell ÷ molecular weight) × Avogadro constant
The calculator first standardizes all concentration and volume units into grams and milliliters. It then applies dilution, purity, recovery, and viability corrections before dividing by the viable cell count.
If molecular weight is supplied, the tool converts protein mass per cell into moles per cell and then into molecules per cell using 6.02214076 × 1023.
How to Use This Calculator
- Enter the measured protein concentration and choose the correct concentration unit.
- Add the sample volume and its unit so the calculator can derive total protein mass.
- Enter dilution factor if the assay result must be scaled back to the original sample.
- Provide the cell count and unit, then adjust purity, recovery, and viability percentages.
- Optionally enter molecular weight to estimate molar amount and molecules per cell.
- Click the calculate button to show results above the form, below the header area.
- Use the CSV or PDF buttons to save the computed results for reporting.
Frequently Asked Questions
1. What does protein per cell tell me?
It estimates how much protein mass belongs to each cell after your chosen corrections. This helps compare samples, monitor extraction quality, and normalize biological measurements across cultures or treatments.
2. Why do purity and recovery matter?
Purity adjusts for non target material in the sample. Recovery accounts for losses during extraction or cleanup. Together, they make the estimate closer to the protein amount truly attributable to cells.
3. Should I include viability percent?
Use viability when you want protein normalized to living cells only. If dead cells still contribute meaningfully to your assay, you may leave viability at one hundred percent.
4. What molecular weight should I enter?
Enter the approximate molecular weight of the protein of interest in daltons, also called grams per mole. Leave it blank if you only need mass per cell and not molecules per cell.
5. Can I use total lysate protein here?
Yes. The calculator works with total protein concentration measurements from lysates, provided your cell count matches the same sample and your adjustment percentages reflect the preparation workflow.
6. Which units are supported?
You can enter several concentration units, three volume units, and multiple cell count scales. The tool converts everything internally before calculating the final per cell estimates.
7. Why is my molecules per cell value missing?
That result appears only when molecular weight is provided. Without it, the calculator cannot convert protein mass per cell into molar amount or molecular copy number.
8. Is this calculator suitable for publication data?
It is useful for planning, checking, and reporting estimates. For publication work, confirm unit consistency, assay calibration, replicate handling, and uncertainty treatment in your formal analysis pipeline.