★★★★★Available on the App Store and Google Play

Caliper & TapeBody Fat Analysis

Nine research-backed formulas for skinfold calipers and tape measure. Works with Bozeera, Harpenden, Lange — any caliper you own.

✓ ±3-5% PRO+ Accuracy
✓ 6 Caliper & Advanced Methods
“I’ve been waiting for a fully fledged calculator for my Bozeera body fat callipers that isn’t a website and is accessible offline for years!”
★★★★★ App Store review

Start for FREEUPGRADETO PRO+From £3.99/mo

Entering skinfold caliper measurements for the Durnin & Womersley method
Choosing from the nine body fat formulas, each with its margin of error
Body fat result to two decimal places with fat mass and lean mass
9 Professional Methods

Choose Your Perfect Method

From quick estimates to detailed skinfold protocols, we offer the most comprehensive selection of published formulas. Each method is optimized for different needs and equipment availability. Trainers, athletes and fitness enthusiasts can stay with one method and one measurement technique to track trends over time. Jackson & Pollock, Durnin & Womersley and Parrillo read from a skinfold caliper, while the U.S. Navy method comes from military technical reports and field protocols.

±3-5%PRO+ Accuracy
6PRO+ Methods
3Free Methods

Parrillo

±3-4%
PRO+

Bodybuilding-focused method using nine skinfold sites

Jackson & Pollock 7-Site

±3-4%
PRO+

Most thorough method with seven skinfold measurements

Jackson & Pollock 4-Site

±3.5-4.5%
PRO+

Uses age and four strategic skinfold measurements

Durnin & Womersley

±3.5-5%
PRO+

Scientific method using four skinfold measurements

Jackson & Pollock 3-Site

±4-5%
PRO+

Quick but accurate method using three skinfold sites

Covert Bailey

±4-5%
PRO+

Comprehensive method using multiple body measurements

US Navy

±4-6%

Military method using height and circumference measurements

Modified YMCA

±4-6%

Enhanced YMCA method with additional measurements for women

YMCA

±5-7%

Simple method using weight and waist measurements

All accuracy ranges are estimates based on published Standard Error of Estimate (SEE) values or comparable metrics. Real-world accuracy depends on measurement technique, equipment quality, and individual factors.

Everything you need to track your progress.

Track measurements over time, sync across devices, connect to Apple Health and Google Health Connect, and stay consistent with smart reminders — all in one app.

  • Progress Tracking

    Measurement history with visual charts showing body composition changes over time.

  • Cloud Sync

    iCloud and Google Drive sync — your data seamlessly available across all your devices.

  • Health Integration

    Syncs with Apple Health and Google Health Connect for a complete picture.

  • Smart Reminders

    Configurable on-device reminders to keep your measurement routine consistent.

  • Progress Photos

    Attach photos to saved measurements and see visual change alongside the numbers.

  • Metric & Imperial

    Seamlessly switch between metric and imperial units at any time.

  • Privacy First

    Your measurements stay on your device — no accounts required, no data sold.

Free or PRO+ — Your Choice

Start free or unlock all features with PRO+ — available as a subscription or one-time lifetime purchase

Free Version

Perfect for casual measurements

3 Free Basic Methods
±4-7% Accuracy
Whole-number results

Free forever

RECOMMENDED

PRO+

One-time option available

For professionals and enthusiasts

6 Additional Professional Methods
History & Progress Tracking
Cloud Sync & Health Integration
Progress Photos & History
Two-decimal precision (in and out)
From£3.99/month or £49.99 lifetime

Ready to get started?

Download now and start measuring

Frequently asked questions

Have more questions? View all FAQs or contact our support team.

    • What is body fat percentage?

      Body fat percentage is the total mass of fat divided by total body mass. It includes both essential fat (needed for basic bodily functions) and storage fat. This measurement is more meaningful than BMI for assessing body composition.

    • How accurate are the measurements?

      Accuracy depends on the method and your technique. Free methods typically fall around ±4-7%, while PRO+ skinfold methods are typically ±3-5%. All ranges are estimates — real-world accuracy depends heavily on correct site location, consistent technique, caliper quality, and hydration status. Track trends over time rather than treating any single reading as exact.

    • What does PRO+ include?

      PRO+ unlocks 6 additional professional measurement methods (including Jackson & Pollock and Durnin & Womersley), decimal precision, measurement history with progress tracking, cloud sync via iCloud or Google Drive, health app integration (Apple Health and Google Health Connect), customisable reminders, and Family Sharing with up to 5 members on iOS.

    • Do I have to subscribe?

      Not at all! While we offer monthly (£3.99) and annual (£19.99/yr) plans, we also have a one-time lifetime purchase (£49.99) for those who prefer to pay once. Whichever option you choose, you get the same full PRO+ experience.

    • What equipment do I need?

      Circumference methods only need a soft tape measure. Skinfold methods require calipers. We recommend professional-grade calipers like Harpenden or Lange for best results, though any calipers (like BOZEERA) will work for getting started.

    • What happens to my existing PRO lifetime purchase?

      Your PRO lifetime purchase is safe — you keep advanced formulas and decimal precision forever, at no additional cost. The new PRO+ features (measurement history, cloud sync, health integration, reminders, and Family Sharing on iOS) are available as an optional upgrade at 50% off as a thank-you for your early support.