Pre-computed result page
Body Fat Estimate: 18-Year-Old Female (BMI Method)
This page uses a reference profile for age and gender to pre-compute body-fat percentage with the BMI-based body-fat equation.
Average category estimate
29.1%
Estimated body fat is 29.1% for this profile. The estimate uses age 18, a representative BMI, and standard BMI-to-body-fat conversion equations.
Female Body Fat Reference Ranges
Rows show typical body-fat averages by age group and the difference from this pre-computed estimate.
| Age Group | Avg Body Fat | Avg BMI | Difference | Position |
|---|---|---|---|---|
| 18-29 | 30.1% | 25.3 | -1.0% | Below this group average |
| 30-39 | 33.1% | 27.1 | -4.0% | Below this group average |
| 40-49 | 35.8% | 28.3 | -6.7% | Below this group average |
| 50-59 | 38.1% | 29.0 | -9.0% | Below this group average |
| 60-70 | 39.0% | 28.8 | -9.9% | Below this group average |
Interpreting This Body Fat Estimate
At 29.1%, this profile sits in the average band. Body-fat categories are useful for context but are still approximations.
The BMI method is practical for fast screening, but direct methods (DEXA, multi-site skinfolds, or consistent circumference tracking) can improve precision for individuals.
Use trend direction over time as the key signal. A steady decline with stable performance and recovery is usually more meaningful than one isolated reading.
Frequently Asked Questions
Why is this page based on the BMI body-fat method?
BMI-derived body-fat estimates are reproducible and require minimal inputs, making them suitable for pre-computed comparison pages. The full calculator offers additional methods.
What does 29.1% body fat imply?
It places this profile in the average category. Interpretation should include waist, performance, and metabolic markers where possible.
How often should body fat be reassessed?
Every 2-4 weeks is common. Keep conditions consistent (time of day, hydration, and method) to improve comparability.
Related Result Pages
Want a personalized calculation?
Open the full body fat calculator to use your own measurements and compare multiple methods side-by-side.