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Sitting Height Ratio Calculator

Calculate your Cormic Index and see how your sitting height compares with your total height. Your body proportions can influence the mechanics of exercises such as the squat and deadlift, but the ratio alone does not determine technique.

1

Measurement unit

The English version starts with inches. You can switch to centimeters at any time, and the calculator will convert your existing values.

2

Enter your measurements

Ideally, take both measurements on the same day and in a consistent position. Measure sitting height upright on a stable, level surface.

Total height

in
Measure barefoot with an upright posture.

Sitting height

in
Measure from the sitting surface to the top of your head.
Standing height —
Sitting height —
Ratio —
Formula: Cormic Index = (sitting height ÷ standing height) × 100
3

Check your measurements

Sitting height must be lower than total standing height. The Cormic Index expresses sitting height as a percentage of total stature.

Important: the Cormic Index describes body proportions. It does not by itself determine whether you will be a better or worse squatter or deadlifter. Exercise mechanics are influenced by limb lengths, joint geometry, technique and individual mobility.
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How does the Sitting Height Ratio Calculator work?

The Cormic Index, also known as the Sitting Height Ratio, expresses sitting height as a percentage of total standing height. It provides a simple way to describe how an individual's stature is proportioned between sitting height and the remainder of total stature.

Metric Formula Meaning
Cormic Index (Sitting height ÷ standing height) × 100 Sitting height expressed as a percentage of total stature.
Sitting-height proportion Cormic Index Shows what percentage of total stature is represented by sitting height.
Remaining stature 100 − Cormic Index The portion of total stature above sitting height. This is not the same as directly measured anatomical leg length.

1. Standing height

Measure your full standing height barefoot with an upright posture, ideally under standardized conditions.

2. Sitting height

Measure from the sitting surface to the top of your head while sitting upright on a stable, level surface.

3. Calculate the ratio

Divide sitting height by standing height and multiply by 100 to obtain the Cormic Index as a percentage.

Formula used:
Cormic Index = (sitting height ÷ standing height) × 100

For example, with a standing height of 70.9 in and a sitting height of 36.2 in: (36.2 ÷ 70.9) × 100 = 51.06%.

The Cormic Index describes body proportions rather than directly predicting athletic performance. Squat and deadlift mechanics are also influenced by individual limb lengths, joint geometry, mobility, technique and other factors.

Measurement technique matters: the same person can obtain different values if standing or sitting height is measured under different conditions.

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Fitness Calculators
Sitting Height Ratio Calculator

The Sitting Height Ratio Calculator calculates your Cormic Index from your sitting height and total standing height. The formula is sitting height ÷ standing height × 100, showing what percentage of your stature is represented by sitting height. It can help you understand your overall body proportions, although the Cormic Index alone cannot determine squat or deadlift technique or performance.

Medical Disclaimer: The calculator results and information provided in this article are for educational and informational purposes only and do not constitute medical, health, or professional advice. Always consult with a qualified healthcare provider before making any decisions related to your health, diet, or fitness goals. Individual results may vary, and this tool should not be used to diagnose or treat any medical condition.

What is the Cormic Index?

The Cormic Index is the ratio of sitting height to total standing height expressed as a percentage. It provides a simple anthropometric measure of how sitting height relates to overall stature. The index describes body proportions rather than categorizing a person as better or worse built for a particular exercise.

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How does the calculator calculate Sitting Height Ratio?

The calculator divides sitting height by standing height and multiplies the result by 100. For example, a 70.9-inch standing height and 36.2-inch sitting height produce a Cormic Index of approximately 51.06%. Both measurements must refer to the same person and use the same unit.

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What does a higher or lower Cormic Index mean?

A higher Cormic Index means sitting height represents a larger proportion of total stature. A lower value means sitting height represents a smaller proportion of total stature. The number itself is a description of body proportions and is not inherently good or bad.

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Does body proportion affect the squat?

Body proportions can influence the joint angles and movement path a person uses during a squat. Relative femur, tibia and torso lengths can contribute to differences in required torso inclination and other mechanics. However, the Cormic Index alone cannot determine the best squat technique for an individual.

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Does body proportion affect the deadlift?

Deadlift mechanics depend on several proportions, including arm length, femur length and torso length. Hip position, mobility and technique also affect the starting position and bar path. The Cormic Index can therefore provide body-proportion context, but it should not be treated as a direct predictor of deadlift performance.

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Is Sitting Height Ratio the same as leg length?

No. Sitting Height Ratio compares sitting height with total standing height, so the remaining percentage is not the same as directly measured anatomical leg length. A specific leg-length measurement requires a separate anthropometric measurement.

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