What Is a Good GKI? Glucose Ketone Index Explained

Short answer: there is no single good GKI for everyone. GKI is a ratio of your blood glucose to your blood ketones, and sources stress that ranges online describe the ratio, not whether a result is good or bad (diabetesknow.com).

How GKI is calculated

GKI = glucose (mmol/L) / ketones (mmol/L). If glucose is in mg/dL, use (glucose mg/dL / 18.016) / ketones mmol/L. The formula comes from Meidenbauer, Mukherjee and Seyfried, 2015 (doi:10.1186/s12986-015-0009-2).

Try the GKI calculator for the number only. It is for information only and is not medical advice.

How ranges are commonly described

Patient.info describes a GKI above 9 as likely not in ketosis, 6 to 9 as low-level ketosis and 3 to 6 as moderate nutritional ketosis (patient.info). These labels describe the ratio only. SugarHigh does not set GKI targets.

What people ask about GKI

Reddit threads in r/keto ask whether a lower GKI means faster fat loss. Replies in that thread point out that ketone levels and fat loss are not the same thing. SugarHigh treats GKI as a number to log and observe, not a target.

Tracking GKI in SugarHigh

SugarHigh lets you log glucose and ketone readings you take yourself and view your GKI over time in History & Charts. It does not measure glucose or ketones. See glucose and ketone tracking.