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About this tool
Convert serum creatinine between mg/dL and micromoles per litre with the 88.4 factor, plus an optional CKD-EPI 2021 eGFR.
The Creatinine Unit Converter changes a serum creatinine result between mg/dL and micromoles per litre using the factor 88.4, which comes from creatinine's molar mass of 113.12 g/mol. It also places the result against the usual adult reference intervals and, if you add an age, estimates GFR with the race-free CKD-EPI 2021 creatinine equation published in the New England Journal of Medicine. mg/dL is standard in the US and India; µmol/L is used across the UK, Europe, Canada and Australia.
Open Creatinine Unit Converter on AltFTool — it loads instantly in your browser.
Enter the 'Serum creatinine' value and choose the unit on the report — mg/dL or µmol/L.
Pick the reference range to use and enter an age from 18 to 110, or leave 'Age in years' blank to skip the eGFR estimate.
Read the converted value, its position against the reference interval and the CKD-EPI 2021 eGFR, then click 'Copy result'.
Multiplies by 88.4 in one direction and divides in the other, so results round-trip without drift.
Uses CKD-EPI 2021, which removed the race coefficient used in the 2009 formula.
Shows the typical reference interval and the KDIGO GFR category the estimate falls into.
Multiply by 88.4. So 1.0 mg/dL is 88.4 µmol/L and 1.2 mg/dL is 106 µmol/L. Divide by 88.4 to convert micromoles per litre back to mg/dL.
Typical adult intervals are roughly 0.74 to 1.35 mg/dL (65 to 119 µmol/L) for men and 0.59 to 1.04 mg/dL (52 to 92 µmol/L) for women. Intervals vary by laboratory and assay, so always compare against the range printed on your own report.
It estimates GFR from creatinine, age and sex: eGFR = 142 × min(Scr/κ,1)^α × max(Scr/κ,1)^−1.200 × 0.9938^age, multiplied by 1.012 for females. The 2021 revision removed the race coefficient present in the 2009 equation, because race is a social rather than biological variable and the old adjustment could delay care.
Creatinine comes from muscle, so more muscle mass, a large meat intake, intense exercise or creatine supplements all raise it without any change in kidney function. Dehydration and some medicines, including trimethoprim and cimetidine, also raise the measured value. This is why a single result is interpreted alongside eGFR, urine albumin and your clinical picture rather than on its own.
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