Weight Tracker: BMI Calculator

aktiWir GmbH

Contains adsIn-app purchases

About this app

Join over 500,000 people who use aktiBMI to track their weight, monitor their BMI and stay motivated on their health journey.

aktiBMI makes weight tracking simple, clear and surprisingly enjoyable. With motivating rewards, milestone celebrations and positive feedback, it’s the companion that keeps you going.

Whether you want to lose weight, gain muscle or maintain a healthy lifestyle, aktiBMI shows you what truly works.

🎯 Set and Achieve Your Weight Goals
Define your goal weight and follow your progress with simple charts and visual trends. Celebrate small wins, stay consistent and reach your goals at your own pace. aktiBMI turns every update into a moment of motivation.

📐 Accurate, Easy-to-Use BMI Calculator
Get a clear understanding of your BMI with age- and gender-aware calculations. See your ideal weight range and track changes over time.
Full US Unit Support: Seamlessly switch between pounds (lbs), feet/inches or metric units.

📊 Weight Diary & Progress Charts
Record your weight daily and visualize your journey with clean, easy-to-read graphs. Spot trends, stay motivated and build long-lasting habits through your personal weight diary.

🎉 Motivation, Rewards & Fun Progress Tracking
Unlike many weight apps that feel clinical or dull, aktiBMI adds motivation and enjoyment to your routine. Celebrate milestones with uplifting sounds, encouraging messages and fun reward effects that make tracking your progress feel rewarding — not tedious.

🔍 Advanced Body Composition Insights
Go beyond the scale: track body fat percentage, muscle mass, water balance and key measurements (waist, hips, chest). See meaningful changes even when your weight stays the same.

🔗 Google Fit Integration
Sync your weight, BMI and body data automatically with Google Fit and keep all your health information in one place.

📄 Professional PDF Health Reports
Generate clear, professional PDF reports of your weight, BMI and body measurements — perfect for sharing with your doctor, trainer or nutrition coach.

👨‍👩‍👧‍👦 Multi-User Support
Track progress together. aktiBMI supports multiple users, making it ideal for couples, families or friends who want to stay motivated as a team.

💬 WHAT OUR USERS SAY

⭐ James H.
"Helps me stay on track thanks to its clear layout. Since 2019 — about 65 lbs lost. A huge thank-you! ❤"

⭐ Sarah R.
"Easy to use and keeps me motivated. I love the fanfare sound when I make progress! 🎉"

⭐ Julia N.
"Motivates me with ‘Great, only a few pounds left!’
And even when I gain a bit, the app stays positive — exactly what I needed!"

🚀 KEY FEATURES AT A GLANCE
• Weight Tracker & Log (lbs/kg)
• BMI Calculator (Age & Gender Specific)
• Body Composition & Body Fat Tracking
• Motivating Rewards & Milestone Celebrations
• Smart Weigh-in Reminders
• Google Fit Integration
• PDF Health Reports
• Multi-User Support

Download aktiBMI today and start tracking your weight, BMI and body composition with a clear, motivating system designed to help you feel your best.

Ratings and reviews

No matter which method I try, I cannot successfully import my weight log from my old phone, to my new one. Had I known this would have been an issue, I never would have downloaded this app to begin with. You should be able to sign up, where you can log into this app from anywhere, but, you cannot. It'd be nice if you could store info for more than just one person, as well. I have been using two apps to store my info, and my significant other. The app I used for him, saved his info.

I just purchased pro for the extra logging options, but what a waste. I've had to re-enter data and save multiple times as the app didn't save the 1st time. It only allows muscle in %, and my scale gives it in lbs. I can change my height to inches, but I can't change the measurements from cm. I'd like to be able to track a few other things, but there's no option to add or repurpose.

This 'newer' version, designed around advertising, isn't as simple & straight forward as the old one. Sound doesn't work. That said - assuming you 'upgrade' ($40) you can get rid of advertising. It offers a bunch of stuff, not sure of value yet, to help monitor & control weight. I liked the older display better, but I don't 'need' my picture to know it's my info. The graphs & charts may be useful. Not sure yet.

What’s new

🎯 aktiBMI supports you on your journey to your ideal weight. Together, we’ll reach your goal! 💪