Medical unit converter
US labs report in different units from most of the rest of the world. If your result is in mg/dL and the article you are reading is in mmol/L, this converts between them.
Notes on specific conversions
A1C and average glucose
Estimated average glucose (eAG) translates an A1C percentage into the average blood sugar it corresponds to, using the formula from the A1C-Derived Average Glucose study that the American Diabetes Association uses. It is an average across roughly three months, not a prediction of any individual reading - two people with the same A1C can have very different day-to-day swings. Our page on what A1C measures covers the caveats.
Same number, different label
Two common values need no conversion at all: TSH in uIU/mL and mIU/L are the same number, and ferritin in ng/mL and ug/L are the same number. If a result looks wildly different from something you read, check the units before anything else - a glucose of 5.5 and a glucose of 99 can be the same result.
Where the factors come from
Each conversion multiplies by the ratio of molecular weight to unit scale - fixed constants used identically by every laboratory. The formula used is shown under every result so you can check the arithmetic yourself.
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