Convert weight between pounds and kilograms, waist measurements between inches and centimeters, or calculate waist-to-height ratio with clear unit-matched results.

Required: weight and its current unit.
Weight alone cannot determine waist circumference; choose a supported conversion or ratio.

Waist-to-Height Ratio (WHtR) Formula

There is no medically valid, universal formula that converts body weight (pounds) into waist circumference (inches) for an individual. However, a widely used screening metric is the waist-to-height ratio (WHtR), which compares your measured waist circumference to your height.

WHtR = W / H

Variables:

  • WHtR is the waist-to-height ratio (unitless)
  • W is your waist circumference (in or cm)
  • H is your height (in or cm)

To calculate WHtR, measure your waist and height in the same unit (both inches or both centimeters) and divide waist by height. A common rule of thumb for adults is to keep your waist under half your height (WHtR < 0.5).

Height to Waist Reference (Target WHtR = 0.5 → Waist ≈ 0.5 × Height)
Height (in) Target Waist (in)
5829.0
6030.0
6231.0
6432.0
6633.0
6834.0
7035.0
7236.0
7437.0
7638.0
7839.0
Formula: WHtR = Waist ÷ Height. For a WHtR of 0.5, Target Waist = 0.5 × Height (using the same units). Unit notes: 1 kg = 2.20462 lb; 1 in = 2.54 cm.

What is the Pounds to Waist Inches Calculator?

This page provides a weight and waist unit converter (lb↔kg, in↔cm) and a waist-to-height ratio (WHtR) calculator. While people often search for a “pounds to waist inches” conversion, waist circumference can’t be accurately predicted from body weight alone because it varies with height, sex, body composition, fat distribution, age, and other factors.

How to Calculate Waist-to-Height Ratio?

The following steps outline how to calculate waist-to-height ratio (WHtR).

  1. Measure your waist circumference (W) in inches or centimeters.
  2. Measure your height (H) in the same unit (inches or centimeters).
  3. Divide waist by height: WHtR = W ÷ H.
  4. Compare the result to common adult guidance such as “keep your waist less than half your height” (WHtR < 0.5).

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Waist (W) = 34 in

Height (H) = 68 in

Using the formula, WHtR = W / H, we can calculate the waist-to-height ratio.

WHtR = 34 / 68 = 0.50