health calculator

GKI Ketosis Calculator

Compute your Glucose Ketone Index (GKI) to track therapeutic ketosis levels.

Formula Verified by Dr. Sarah Jenkins, PhD

Quick actions: Save inputs, view saved runs, print, share, or export results

Saved Runs

Inputs

Glucose Unit

Blood Glucose (mg/dL)mg/dL

Blood Ketones (mmol/L)mmol/L

Results

Glucose Ketone Index (GKI)

3.33

Ketosis LevelModerate Ketosis (Ideal for weight loss & metabolism)

Normalized Glucose5.0 mmol/L

Measured Ketones1.50 mmol/L

Bookmark this GKI Calculator

Save this page to easily track your daily GKI scores and manage your therapeutic ketosis zones.

Formula

Glucose Ketone Index (GKI) Formula

GKI = (Blood Glucose in mmol/L) / Blood Ketones in mmol/L

Determines the clinical ratio of glucose and ketones. mg/dL values are divided by 18.016 to convert to mmol/L.

Step by step

How the calculation works

1Input your blood glucose level and select the correct unit (mg/dL or mmol/L).
2Input your blood ketone level measured in mmol/L.
3The calculator will convert glucose units if necessary and divide by the ketones value.
4Review your GKI ratio and corresponding ketosis level classification (No Ketosis, Light, Moderate, Deep).

Example

Example GKI Scenario

A blood glucose of 90 mg/dL (5.0 mmol/L) and blood ketones of 1.5 mmol/L yields a GKI ratio of 3.33, indicating "Moderate Ketosis" ideal for fat loss and metabolic optimization.

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How to understand and use this calculator

What is the Glucose Ketone Index (GKI)?

First developed by Dr. Thomas Seyfried and his team at Boston College, the Glucose Ketone Index (GKI) is a single, clinical metric that evaluates the relationship between blood glucose and blood ketones. It offers a standardized assessment of metabolic status, moving beyond isolated ketone measurements.

GKI is widely used in metabolic therapies—such as adjunctive support for oncology, epilepsy, neurodegenerative diseases, and therapeutic weight loss. Track your GKI alongside macronutrient balances calculated with our macro calculator and insulin levels using our insulin sensitivity calculator.

The Mathematics of the GKI Ratio

GKI requires converting blood glucose from standard US units ($mg/dL$) to metabolic units ($mmol/L$). The conversion factor is $18.016$:

$$\text{Glucose (mmol/L)} = \frac{\text{Glucose (mg/dL)}}{18.016}$$

The GKI ratio is then calculated by dividing glucose by blood ketones ($mmol/L$):

$$\text{GKI} = \frac{\text{Glucose (mmol/L)}}{\text{Ketones (mmol/L)}}$$

A GKI of $\ge 9.0$ indicates no ketosis; $6.0$ to $9.0$ represents light ketosis; $3.0$ to $6.0$ is moderate ketosis (ideal for weight loss and general health); and a GKI of $< 3.0$ represents deep, therapeutic ketosis.

Managing Ketosis through Nutrition and Fasting

Reaching lower GKI zones typically requires carbohydrate restriction, adequate protein intake (monitored with our protein calculator), healthy fats, and fasting. Metabolic rate tracked with our TDEE calculator helps ensure your energy budget supports your weight goals during keto adaptation.

Frequently Asked Questions

What does GKI stand for?+

GKI stands for Glucose Ketone Index, which measures the ratio of blood glucose to blood ketones.

What is a good GKI score for weight loss?+

A GKI between 3.0 and 6.0 indicates moderate ketosis, which is highly optimal for fat burning, weight loss, and general metabolic health.

What is therapeutic ketosis?+

Therapeutic ketosis (GKI < 3.0) is a metabolic state used clinically for conditions like epilepsy, cancer therapy support, and cognitive disorders.

How is GKI calculated if glucose is in mmol/L?+

If glucose is already in mmol/L, simply divide the glucose value by the ketone value (GKI = Glucose / Ketones).

Why is GKI more useful than measuring ketones alone?+

Measuring ketones alone ignores blood sugar levels. A high ketone reading paired with high glucose indicates metabolic stress rather than optimal fat adaptation.

How do you measure glucose and ketones for GKI?+

You measure them using a dual blood glucose and ketone meter. Urine strips are not accurate enough for clinical GKI calculations.

What causes GKI to rise?+

Eating carbohydrates, excess protein, stress, lack of sleep, or intense workouts can raise blood glucose or lower ketones, causing GKI to rise.

How does fasting affect GKI?+

Fasting depletes liver glycogen stores, lowering blood glucose and stimulating ketone production, which lowers your GKI ratio.

Is a GKI below 1.0 safe?+

A GKI below 1.0 is generally safe for healthy individuals in deep ketosis, but should be monitored closely under medical supervision, especially for therapeutic applications.

How often should I check my GKI?+

For general health, once a day (usually in the morning or before dinner) is sufficient. For therapeutic goals, monitoring 2-3 times a day is common.

How the calculation works

1Input your blood glucose level and select the correct unit (mg/dL or mmol/L).

2Input your blood ketone level measured in mmol/L.

3The calculator will convert glucose units if necessary and divide by the ketones value.

4Review your GKI ratio and corresponding ketosis level classification (No Ketosis, Light, Moderate, Deep).

How to understand and use this calculator

What is the Glucose Ketone Index (GKI)?

The Mathematics of the GKI Ratio

GKI requires converting blood glucose from standard US units ($mg/dL$) to metabolic units ($mmol/L$). The conversion factor is $18.016$:

$$\text{Glucose (mmol/L)} = \frac{\text{Glucose (mg/dL)}}{18.016}$$

The GKI ratio is then calculated by dividing glucose by blood ketones ($mmol/L$):

$$\text{GKI} = \frac{\text{Glucose (mmol/L)}}{\text{Ketones (mmol/L)}}$$

Managing Ketosis through Nutrition and Fasting

Frequently Asked Questions

What does GKI stand for?+

GKI stands for Glucose Ketone Index, which measures the ratio of blood glucose to blood ketones.

What is a good GKI score for weight loss?+

A GKI between 3.0 and 6.0 indicates moderate ketosis, which is highly optimal for fat burning, weight loss, and general metabolic health.

What is therapeutic ketosis?+

Therapeutic ketosis (GKI < 3.0) is a metabolic state used clinically for conditions like epilepsy, cancer therapy support, and cognitive disorders.

How is GKI calculated if glucose is in mmol/L?+

If glucose is already in mmol/L, simply divide the glucose value by the ketone value (GKI = Glucose / Ketones).

Why is GKI more useful than measuring ketones alone?+

Measuring ketones alone ignores blood sugar levels. A high ketone reading paired with high glucose indicates metabolic stress rather than optimal fat adaptation.

How do you measure glucose and ketones for GKI?+

You measure them using a dual blood glucose and ketone meter. Urine strips are not accurate enough for clinical GKI calculations.

What causes GKI to rise?+

Eating carbohydrates, excess protein, stress, lack of sleep, or intense workouts can raise blood glucose or lower ketones, causing GKI to rise.

How does fasting affect GKI?+

Fasting depletes liver glycogen stores, lowering blood glucose and stimulating ketone production, which lowers your GKI ratio.

Is a GKI below 1.0 safe?+

A GKI below 1.0 is generally safe for healthy individuals in deep ketosis, but should be monitored closely under medical supervision, especially for therapeutic applications.

How often should I check my GKI?+

For general health, once a day (usually in the morning or before dinner) is sufficient. For therapeutic goals, monitoring 2-3 times a day is common.

GKI Ketosis Calculator

Inputs

Results

Bookmark this GKI Calculator

Glucose Ketone Index (GKI) Formula

How the calculation works

Example GKI Scenario

Learn more about this calculation

BMI Calculation Guide: Formula, Ranges, and Limits

How to Use Do The Calculation Calculators: A Practical Step-by-Step Guide

Macro Calculator

Meal Glycemic Load

HOMA-IR Calculator

Calorie Calculator

GKI Ketosis Calculator

Inputs

Results

Bookmark this GKI Calculator

Key output metrics

GKI metabolic zone classification

How to understand and use this calculator

What is the Glucose Ketone Index (GKI)?

The Mathematics of the GKI Ratio

Managing Ketosis through Nutrition and Fasting

Frequently Asked Questions

Glucose Ketone Index (GKI) Formula

How the calculation works

Example GKI Scenario

Learn more about this calculation

BMI Calculation Guide: Formula, Ranges, and Limits

How to Use Do The Calculation Calculators: A Practical Step-by-Step Guide

Macro Calculator

Meal Glycemic Load

HOMA-IR Calculator

Calorie Calculator

Key output metrics

GKI metabolic zone classification

How to understand and use this calculator

What is the Glucose Ketone Index (GKI)?

The Mathematics of the GKI Ratio

Managing Ketosis through Nutrition and Fasting

Frequently Asked Questions