Enter your height into the calculator to get a rough estimate of leg length. This calculator uses a simple rule-of-thumb proportion (0.45 × height); individual proportions and measurement methods vary, so results may differ from a direct measurement.
Note: This is an educational, population-average estimate using a 0.45×height rule of thumb (adult proportions can vary, often roughly in the mid‑40% range depending on how “leg length” is defined/measured). Results may be off by several cm/in and are not for diagnosing leg‑length discrepancy, growth issues, or other medical conditions—if you have concerns or symptoms, seek evaluation from a qualified clinician.
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Height to Leg Length Formula
A common rule-of-thumb estimate for leg length uses a fixed proportion of total height:
LL = H * 0.45
Variables:
- LL is the estimated lower-limb length (the exact value depends on the definition/landmarks used)
- H is standing height
To estimate leg length, multiply the person’s height by 0.45. Alternatively, if an estimated leg length is known, the height can be approximated by dividing the leg length by 0.45. Because body proportions vary by individual and measurement method, treat this as a rough estimate rather than a precise measurement.
| Height (cm) | Leg Length (cm) |
|---|---|
| 140 | 63.0 |
| 145 | 65.3 |
| 150 | 67.5 |
| 155 | 69.8 |
| 160 | 72.0 |
| 165 | 74.3 |
| 170 | 76.5 |
| 175 | 78.8 |
| 180 | 81.0 |
| 185 | 83.3 |
| 190 | 85.5 |
| 195 | 87.8 |
| 200 | 90.0 |
| 205 | 92.3 |
| 210 | 94.5 |
| 215 | 96.8 |
| 220 | 99.0 |
| 225 | 101.3 |
| 230 | 103.5 |
| 235 | 105.8 |
| * Rounded to 1 decimal. This table uses a 0.45 × height rule-of-thumb; real-world proportions vary by person and by how leg length is measured. | |
What is Leg Length?
“Leg length” can mean different things depending on the context and measurement method. In clinical settings it may be measured between specific landmarks (for example, from the anterior superior iliac spine (ASIS) to the medial malleolus, or from the greater trochanter to the floor), while in apparel/ergonomics it often aligns more closely with inseam (crotch to floor). Because different definitions produce different numbers, direct measurement is best when accuracy matters.
How to Calculate Leg Length from Height?
The following steps outline how to estimate leg length from height:
- Measure the person’s height (H) in the chosen unit.
- If leg length is unknown, use the formula LL = H * 0.45 to estimate it.
- If the leg length is provided and height is missing, estimate height as H = LL / 0.45.
- Verify your answer using the calculator above.
Example Problem:
For example, if a person’s height (H) is 70 inches, the estimated leg length (LL) would be:
LL = 70 * 0.45 = 31.5 inches
