Glucose Ketone Index (GKI) Calculator
Divide glucose by ketones — with the unit conversion done for you and the result placed on the GKI scale.
What is a good GKI for weight loss? Many people on keto for weight loss sit between 3 and 9. Lower values are not required for fat loss.
What the GKI is
The glucose ketone index is your blood glucose (in mmol/L) divided by your blood ketones (mmol/L). Because it combines both, it moves more clearly than either reading alone. It was proposed in research on therapeutic ketogenic diets; for general keto use it is a tracking metric, not a diagnostic test.
GKI ranges
| GKI | Description |
|---|---|
| Below 1 | Very deep ketosis — typical of extended fasting |
| 1–3 | Deep ketosis |
| 3–6 | Moderate ketosis |
| 6–9 | Light ketosis |
| Above 9 | Not in meaningful ketosis |
Measuring correctly
Take glucose and ketone readings within a few minutes of each other, ideally in the morning before eating. Convert mg/dL to mmol/L by dividing by 18. Ketora calculates GKI automatically whenever you log both readings and charts it over time.
Frequently asked questions
What is a good GKI for weight loss?
Many people on keto for weight loss sit between 3 and 9. Lower values are not required for fat loss.
How do you convert glucose mg/dL to mmol/L?
Divide by 18 (more precisely 18.016). For example 90 mg/dL is 5.0 mmol/L.