Reverse BMI Calculator
This reverse BMI calculator gives the weight that matches a BMI at your height. At 5 ft 9 in, a BMI of 22 is 149 lb (67.6 kg).
Sources: CDC, WHO Updated
Weight at a BMI of 22.0 and a height of 5 ft 9 in
149 lb
Healthy weight BMI 18.5 to 24.9
- Also67.6 kg · 10 st 9 lb
- Healthy weight for this height (BMI 18.5 to 24.9)125–168 lb
The numbers above are an example. Change them to see your own result.
A shared link contains the numbers entered here.
For adults aged 20 and over. A BMI is a screening figure, so a weight worked out from it is a reference point, not a prescription.
Reverse BMI formula: weight from BMI and height
The BMI formula is turned around. BMI is weight divided by height squared, so weight is BMI multiplied by height squared.
weight (kg) = BMI × height (m)²
weight (lb) = BMI × height (in)² ÷ 703
How to calculate weight from BMI: a worked example
Which weight gives a BMI of 22 at 5 feet 9 inches?
- Height in inches: 5 × 12 + 9 = 69 in.
- Height squared: 69 × 69 = 4,761.
- 22 × 4,761 ÷ 703 = 149.0 lb, which is 67.6 kg or 10 st 9 lb.
In metric units: a BMI of 22 at 170 cm is 22 × 1.70 × 1.70 = 63.6 kg.
Weight at BMI 18.5, 25 and 30 by height
The lightest and heaviest weight in the healthy range, and the weight at which the obesity range begins. For adults; based on the BMI rounded to one decimal.
| Height | Healthy weight (BMI 18.5 to 24.9) | Overweight (25.0 to 29.9) | Obesity from (30.0) |
|---|---|---|---|
| 5′ 0″ | 95 to 127 lb | 128 to 153 lb | 154 lb |
| 5′ 2″ | 101 to 136 lb | 137 to 163 lb | 164 lb |
| 5′ 4″ | 108 to 145 lb | 146 to 174 lb | 175 lb |
| 5′ 6″ | 115 to 154 lb | 155 to 185 lb | 186 lb |
| 5′ 8″ | 122 to 164 lb | 165 to 196 lb | 197 lb |
| 5′ 10″ | 129 to 173 lb | 174 to 208 lb | 209 lb |
| 6′ 0″ | 137 to 183 lb | 184 to 220 lb | 221 lb |
| 6′ 2″ | 144 to 194 lb | 195 to 233 lb | 234 lb |
| 6′ 4″ | 152 to 204 lb | 205 to 246 lb | 247 lb |
The BMI chart has every inch of height and a metric version. To go the other way, from weight to BMI, use the BMI calculator. The ideal weight calculator sets the healthy range next to the classic ideal-weight formulas.
Before you pick a target weight from a BMI
- The healthy range is wide on purpose. At 5 feet 9 inches it spans more than 40 pounds. Any weight inside it has a BMI in the healthy range.
- BMI cannot tell muscle from fat. Two people of the same height and weight can have very different bodies. A waist-to-height ratio adds where the weight sits.
- A number from a formula is not a plan. If you want to lose or gain weight, a doctor or registered dietitian can set a goal that fits your health and history.
Questions about weight from BMI
How much should I weigh for my height?
There is no single right weight. For adults, a BMI of 18.5 to 24.9 is the healthy weight range, which is a span of weights for each height: 108–145 lb at 5 ft 4 in, and 129–173 lb at 5 ft 10 in. Where in that span you feel and function best is individual.
What weight is a BMI of 25 at 5 ft 6 in?
155 lb (70.3 kg). A BMI of 25.0 is the point where the overweight range begins.
How is weight calculated from BMI?
By turning the BMI formula around: weight in kilograms = BMI × height in metres squared. In U.S. units, weight in pounds = BMI × height in inches squared ÷ 703.
How do I calculate height from BMI and weight?
Turn the formula around the other way: height in metres = √(weight in kg ÷ BMI), or height in inches = √(703 × weight in pounds ÷ BMI). For the worked example on this page, √(703 × 149.0 ÷ 22) = 69.0 inches, which is 5 ft 9 in. The calculator itself only works from BMI and height to weight.
Is the weight for a BMI different for women and men?
No. The formula uses only the BMI and the height, and CDC applies the same adult categories to women and men. A woman and a man who are both 5 ft 9 in reach a BMI of 22 at 149 lb.
Does a target BMI work for children?
No. For ages 2 to 19 a BMI is read as a percentile for the child's age and sex, so there is no fixed target number. Use the kids BMI calculator and talk to the child's doctor.
Sources
- CDC: BMI frequently asked questions — the formula in metric and U.S. units, and what BMI cannot show (checked October 12, 2026)
- CDC: Adult BMI categories — category names and ranges for adults 20 and older, including obesity classes (checked October 12, 2026)
- WHO: Obesity and overweight (fact sheet) — BMI definition; adult overweight is a BMI of 25 or more, obesity 30 or more (checked October 12, 2026)