Phosphate mmol/L to mg/dL Converter
Instantly convert serum phosphate results between mmol/L and mg/dL. Accurate, free lab unit converter with clinical reference ranges included.
Convert Phosphate Units
Enter a phosphate lab value below to get an instant, precise conversion between mmol/L (SI unit) and mg/dL (conventional US unit).
Phosphate Unit Converter
Enter the value to see the converted result
Converted Value
Based on the standard atomic weight of phosphorus
Common Phosphate Conversions
Standard conversions for quick lookup when comparing lab reports that use different measurement systems.
| mmol/L | mg/dL | Typical Interpretation* |
|---|---|---|
| 0.40 | 1.24 | Markedly low |
| 0.60 | 1.86 | Low |
| 0.81 | 2.51 | Low-normal |
| 1.10 | 3.41 | Normal |
| 1.30 | 4.03 | Normal |
| 1.45 | 4.49 | High-normal |
| 1.60 | 4.96 | Elevated |
| 2.00 | 6.19 | High |
| 3.00 | 9.29 | Markedly high |
Phosphate Conversion FAQ
Everything you need to know about converting and reading serum phosphate lab values.
Multiply the mmol/L value by 3.0974, which comes from the atomic weight of phosphorus (30.974 g/mol) divided by 10. For example, 1.10 mmol/L × 3.0974 = 3.41 mg/dL. To go the other way, multiply mg/dL by 0.3228.
A commonly cited normal serum phosphate reference range for adults is roughly 0.81 to 1.45 mmol/L, equivalent to about 2.5 to 4.5 mg/dL. Ranges vary by laboratory and age group, children and adolescents typically run higher, so the range printed on your own lab report is the one that applies to your result.
Countries using the International System of Units, including the UK, most of Europe, Canada, and Australia, report phosphate in mmol/L. The United States conventionally reports it in mg/dL. Both describe the same blood concentration, just on different numerical scales.
A result below the reference range is called hypophosphatemia and a result above it is called hyperphosphatemia. Both can affect bone, muscle, and kidney function. This calculator only converts units; interpreting what a result means for your health should come from a doctor or other qualified clinician.