Blood test unit converter

How blood test unit conversion works

There is no single “mg/dL to mmol/L” factor. Each substance has its own molecular weight, so the conversion factor is different for every analyte — glucose uses ×18.0, total cholesterol ×38.67, triglycerides ×88.6, and so on.

US labs typically report conventional mass units (mg/dL, g/dL); most of Europe and the rest of the world report SI molar units (mmol/L, µmol/L). This tool uses the same vetted conversion factors BloodId uses internally to chart your results.

Some results cannot be converted between systems — enzyme activity tests like ALT, AST and ALP are reported in U/L (activity), which has no mass-based equivalent. We deliberately do not offer a conversion for those.

Frequently asked questions

How do I convert glucose from mmol/L to mg/dL?

Multiply the mmol/L value by about 18. For example, 5.5 mmol/L × 18 ≈ 99 mg/dL. This tool does it for you and supports many other tests too.

Is there one factor to convert all blood tests?

No. The factor depends on the substance’s molecular weight, so each analyte converts differently. Using one factor for everything gives wrong results — that is why this tool is per-test.

How is HbA1c converted between % and mmol/mol?

Using the IFCC–NGSP master equation: NGSP% = 0.09148 × IFCC(mmol/mol) + 2.152. A simple multiplication is inaccurate because the relationship has an offset, so we use the full equation.

What is eAG?

Estimated average glucose — your average blood glucose estimated from HbA1c using the ADAG study equations. For example, 7.0% HbA1c ≈ 154 mg/dL (8.6 mmol/L).

Why can’t I convert ALT or AST units?

Enzyme tests are measured in activity units (U/L), which have no mass-based equivalent, so a U/L conversion would be meaningless. We do not offer it, to avoid giving inaccurate numbers.