Free calculators
Calculate your maintenance calories and macros using our free online calculators. Complete your calculation online in 60 seconds, then choose your goal to continue in the app.
For Your Unique Metabolism
Smart Calorie Adjustments™ adapt to your metabolism every time you record a new weight.
Scan Your Food to Track Instantly
Scan over 3.8 million barcodes with coverage of US, Canadian, British, European and Australian products.
Search 3.8 Million Food and Drink Items
Complete with calorie and macro data. Search branded products and USDA-verified nutrition profiles.
Analyze a Food's Calories and Macros
Compare a food's macro counts against your daily carbs, fat and protein goals.
Track Your Weight and Your Metabolism
Tap and drag the chart to see your weight on any previous day. Track weight, BMI, macros and more.
Check Your Body Mass Index (BMI)
Calculate your BMI and compare against standard reference ranges. Track your BMI over time.
Frequently asked questions
More from Gym Geek
What is Gym Geek?
Gym Geek is The Smart Calorie Counter That Keeps You on Track. Launched in June 2025, our app has helped over 300,000 people lose, maintain or gain weight.
We also operate the Gym Geek website, helping more than 1 million people a month calculate their calorie deficit and macros with our handy free tools. Our website also hosts expert weight loss guides, exercise guides and workout routines.
From our founder, Brendon Boshell:
1 in 10 of us struggle to lose or maintain weight because of our metabolism. Every person's metabolism is unique, which makes calorie calculators and online weight plans fairly inaccurate for many people.
That's why we built the Gym Geek calorie counter. Unlike other calorie counting apps, Gym Geek adapts to your unique metabolism.
While most calorie counting apps rely on a simple formula to estimate your total daily energy expenditure (TDEE), Gym Geek uses a method called Smart Calorie Adjustments™ to more accurately estimate your TDEE.
Each time you track your weight, Gym Geek uses a statistical model to see whether you are losing weight slower or faster than expected. It then adjusts your TDEE and calorie goal to keep you on track.
You can use Gym Geek to scan barcodes, search items from our 3.8 million item food database or quick track your calories and macros in a single tap.
Read more: About Gym Geek
How to lose weight
Use our calculators and guides to start your weight loss journey:
- Calculate your calorie deficit - Calculate a sustainable calorie deficit using our calorie calculator. The calculator provides deficits from 0.25 kg (0.5 lbs) to 1kg (2.2 lbs) per week — and provides an estimated number of weeks it will take to hit your target weight.
- Lose weight without losing muscle - Read our guide on how to lose weight without losing muscle. To avoid losing muscle, combine a moderate calorie deficit with enough resistance training and cardio.
- Choose a workout routine - Looking to lose weight, build muscle or get in shape for the summer? Gym Geek’s 90 day workout plan targets your whole body and takes just 30 minutes a day! Also check out our 5 day workout routine for women — focused on burning fat and toning muscles.
Find a workout routine
Compare our expert workout routines or build your own with Gym Geek AI:
- Workout routines for beginners - If you’re new to working out, we recommend starting with our at-home bodyweight routine or our 90 day workout plan. Our 3 day full-body routine is also a good option if you want a more intense workout.
- Training splits - Splits like push pull legs (PPL) maximize your workout frequency and enables you to achieve a higher training volume in your routine. Compare our full range of expert workout routines, including our 5 day ULPPL split and PPL split.
- Build your own with Gym Geek AI - Create a personalized workout plan using Gym Geek’s new AI tool. Gym Geek AI can generate a single workout or a structured routine for any fitness goal.







