What this calculator does
Urine protein-to-creatinine ratio works out estimates 24-hour urinary protein loss from a single spot urine sample. Enter your own figures above and the answer updates as you type: nothing is fixed in the code, so the result reflects exactly the numbers you supply.
The formula this calculator evaluates is printed under the tool and explained below, so you can check the working by hand or reuse it in a spreadsheet.
The formula
FormulaEstimated protein excretion (g/day) ≈ Urine protein(mg/dL) / Urine creatinine(mg/dL)
The inputs explained
| Field | What to enter |
|---|---|
| Urine protein (mg/dL) | A number, measured in mg/dL. Starts at 30. |
| Urine creatinine (mg/dL) | A number, measured in mg/dL. Starts at 100. |
Worked examples
Every figure in the tables below is produced by this page’s own calculator at build time, so the numbers and the tool always agree. Select any row to load that scenario.
How the answer changes with urine protein
Every other input is held at the calculator’s starting values while urine protein varies. Select any row to load that scenario into the calculator.
How the answer changes with urine protein
| Urine protein (mg/dL) | Estimated 24-hour protein excretion | Reference | Note |
|---|---|---|---|
| 15 | 0.15 g/day | Normal is typically under about 0.2 g/day; nephrotic-range proteinuria is above 3 to 3.5 g/day | A spot-sample estimate that assumes roughly steady creatinine excretion: a timed collection is more accurate when precision matters. |
| 22.5 | 0.23 g/day | Normal is typically under about 0.2 g/day; nephrotic-range proteinuria is above 3 to 3.5 g/day | A spot-sample estimate that assumes roughly steady creatinine excretion: a timed collection is more accurate when precision matters. |
| 30 | 0.30 g/day | Normal is typically under about 0.2 g/day; nephrotic-range proteinuria is above 3 to 3.5 g/day | A spot-sample estimate that assumes roughly steady creatinine excretion: a timed collection is more accurate when precision matters. |
| 45 | 0.45 g/day | Normal is typically under about 0.2 g/day; nephrotic-range proteinuria is above 3 to 3.5 g/day | A spot-sample estimate that assumes roughly steady creatinine excretion: a timed collection is more accurate when precision matters. |
| 60 | 0.60 g/day | Normal is typically under about 0.2 g/day; nephrotic-range proteinuria is above 3 to 3.5 g/day | A spot-sample estimate that assumes roughly steady creatinine excretion: a timed collection is more accurate when precision matters. |
| 90 | 0.90 g/day | Normal is typically under about 0.2 g/day; nephrotic-range proteinuria is above 3 to 3.5 g/day | A spot-sample estimate that assumes roughly steady creatinine excretion: a timed collection is more accurate when precision matters. |