What is the Dr. Boz Ratio?
The “Dr. Boz Ratio” (sometimes written Boz ratio or Doctor Boz ratio) is a branded calculation that divides blood glucose in mg/dL by blood ketones in mmol/L. It is not a diagnostic test or medical-consensus measure of insulin resistance.
A ratio combines two readings but cannot show which fuel the whole body is “primarily burning,” diagnose disease, or substitute for A1C and glucose tests interpreted by a clinician.
Dr. Boz ratio chart — illustrative bands only
Branded materials sometimes describe bands such as above 80, 40–80, and below 40. Treat those as educational illustrations from that brand — not validated clinical cutoffs or treatment targets.
Use the free Dr. Boz ratio calculator to compute glucose ÷ ketones; do not change medication or fasting plans to chase a chart band.
How to calculate it
The calculation requires glucose in mg/dL and beta-hydroxybutyrate in mmol/L measured at the same time. Home meters have limitations, and context affects both values.
Formula: Dr. Boz Ratio = Glucose (mg/dL) ÷ Ketones (mmol/L). Example: 90 mg/dL ÷ 1.5 mmol/L = 60.
Our fasting clock includes optional fields to track your ratio during active fasts.
How to interpret your number
Unexpected glucose or ketone results should be assessed using your care plan, especially with diabetes, illness, pregnancy, or SGLT2-inhibitor use.
- Published clinical guidelines do not validate 80 or 40 as treatment thresholds.
- A lower value usually results from lower glucose, higher ketones, or both, but does not prove better health.
- Do not use the ratio to justify prolonged fasting, medication changes, or claims about autophagy.
Using the ratio in practice
This site’s calculator uses the branded formula directly: glucose (mg/dL) ÷ ketones (mmol/L). It does not convert glucose to mmol/L first. Some other tools divide glucose by 18 before dividing by ketones — that yields a different number; check which formula a tool uses.
Enter values in our Dr. Boz ratio calculator. Pair with net carb tracking to see how meals move your numbers.