Body Fat Calculator – Estimate Body Fat Percentage Free
Estimate body fat percentage using the BMI method with age and gender inputs. Free online body fat calculator.
Estimated Body Fat
18.1%
100% Private
No Upload
Instant
What is Body Fat Calculator?
A body fat calculator estimates the percentage of your body weight that is fat. Our calculator uses the BMI-based body fat estimation formula, which takes into account age and gender in addition to BMI. Note that this is an estimate — more accurate methods include DEXA scans and hydrostatic weighing.
How to Use Body Fat Calculator
- 1Enter your weight and height.
- 2Enter your age and select your gender.
- 3Your estimated body fat percentage is calculated instantly.
Key Features
- ✓BMI-based body fat estimation
- ✓Age and gender adjustment
- ✓Body fat category classification
- ✓Metric and imperial units
Benefits
- →Track body composition changes over time
- →Understand healthy body fat ranges
- →Use as a starting point for fitness goals
Why Use Irreva for Body Fat Calculator?
Runs 100% in your browser — files never leave your device.
No account, no sign-up, no subscription — free forever.
Works on any device: desktop, tablet, or mobile.
No file size limits from our infrastructure.
Instant results — no server round-trip latency.
Open-source libraries and transparent processing.
Frequently Asked Questions
How accurate is this calculator?
The BMI-based method is a rough estimate. For more accurate measurements, use skinfold calipers, bioelectrical impedance, or DEXA scanning.
What is a healthy body fat percentage?
For men: 6-24% is considered healthy. For women: 16-30% is considered healthy. Athletes typically have lower percentages.
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