How to use the protein solubility calculator
Prepare the values for this calculation
Calculate measured protein solubility from soluble protein recovered in the supernatant and total protein measured on the same basis. Use the formula below to check that it answers your question. Read the input units before transferring figures from a statement, measurement or dataset.
Enter and check each input
- Soluble protein in supernatant (mg/mL): enter a value at least 0. Use the unit named in the label or selected above. Do not leave this required field blank.
- Total protein in sample (mg/mL): enter a value at least 1e-06. Use the unit named in the label or selected above. Do not leave this required field blank.
- Measurement pH (optional context): enter a value at least 0 and no more than 14. Use the unit named in the label or selected above. Do not leave this required field blank.
The input table gives a complete example. Keep units and time periods consistent across related fields.
Calculate and resolve any input error
Choose Calculate after entering the values. Changes also update the answer after a short pause. If an error appears, follow its message, correct the field and calculate again. Reset restores the example values.
Interpret the answer
Check Measured protein solubility first. With the unchanged example inputs, it is 75%. Compare the additional metrics with the primary result; each has its own label and unit.
Compare and keep a useful result
For a controlled comparison, keep every other example input unchanged and change Soluble protein in supernatant (mg/mL) from 7.5 to 8.25. The resulting Measured protein solubility is 82.5%. This illustrates the equation’s response to that input, rather than a forecast of real events.
Read the chart’s axis labels and data table. A scenario curve changes one stated input while holding the others fixed; it does not add external observations. Use Download graph to save an available chart as a PNG.
Use Copy result or Download CSV to keep the answer. Share tool shares the page address without placing your input values in the URL. Recheck inputs and assumptions before using the result for a decision.
Protein Solubility Calculator formula
Protein solubility (%) = soluble protein in supernatant ÷ total protein in sample × 100.
Inputs and units
| Input | Format / range | Example |
|---|---|---|
| Soluble protein in supernatant (mg/mL) | minimum 0 | 7.5 |
| Total protein in sample (mg/mL) | minimum 1e-06 | 10 |
| Measurement pH (optional context) | minimum 0; maximum 14 | 7 |
Worked example
Using the example inputs above, the measured protein solubility is 75%.
- Measured protein solubility
- 75%
- Soluble fraction
- 0.75
- Insoluble fraction
- 25%
- Measurement pH
- 7
Results and assumptions
This calculates measured solubility from matched soluble and total protein measurements; it does not predict solubility from sequence or pH. Buffer composition, ionic strength, hydration, centrifugation and assay method can materially change the measured result.
Sources and method references
Fix an input or unexpected result
Soluble protein in supernatant (mg/mL) is required. Enter soluble protein in supernatant (mg/ml) using the format and bounds in the input table. Zero and an empty field are different: use zero only if it is allowed and represents your data.
If your answer differs from the example, choose Reset and compare every field, including selected units and options. Check percentage versus decimal entry and whether values describe the same period. Round only the final displayed answer when reproducing the formula.
If a discrepancy remains, report the calculator issue with the page address, non-sensitive example inputs, actual result, expected result and a reference for your calculation.