About FitForge
Our Mission
Calculate. Track. Dominate.
FitForge is a suite of free fitness calculators designed to help you make informed decisions about your training and nutrition. Whether you're a beginner or an experienced athlete, our tools provide the data you need to optimize your fitness journey.
What Makes Us Different
🔒 Privacy First
All calculations happen in your browser. We never collect or store your personal data on our servers.
⚡ Instant Results
No sign-ups, no waiting. Enter your data and get accurate results immediately.
📊 Local History
Your calculation history is saved in your browser, letting you track progress over time.
🔗 Share Results
Every calculation gets a shareable link. Easily discuss results with trainers or friends.
Our Calculators
- TDEE Calculator: Calculate your Total Daily Energy Expenditure for weight management
- One Rep Max: Estimate your maximum lift capacity using proven formulas
- Macro Calculator: Determine optimal protein, carb, and fat distribution
- Plate Calculator: Figure out which weight plates to load on your barbell
- Body Fat Calculator: Estimate body fat percentage using the US Navy method
- Strength Standards: Compare your lifts to established strength benchmarks
- BMR Calculator: Calculate your Basal Metabolic Rate
Accuracy & Methodology
Our calculators use scientifically validated formulas including:
- Mifflin-St Jeor equation for BMR/TDEE
- Multiple 1RM formulas (Epley, Brzycki, Lombardi, and more)
- US Navy body fat calculation method
- Established strength standards by bodyweight
Remember: All results are estimates. Individual factors like genetics, training history, and health conditions can affect accuracy.
Free Forever
FitForge is completely free to use. No premium features, no paywalls, no upsells. Just powerful fitness calculators available to everyone.
Frequently Asked Questions
Is FitForge really free?
Yes! FitForge is 100% free with no hidden costs, premium features, or paywalls. All calculators are available to everyone at no charge.
Do I need to create an account?
No account required! You can use all calculators immediately without signing up. Your calculation history is saved locally in your browser using IndexedDB.
Is my data private?
Absolutely. All calculations happen entirely in your browser. We never collect, store, or transmit your personal data to our servers. Your privacy is our priority.
How accurate are the calculators?
Our calculators use scientifically validated formulas and established standards. However, all results are estimates. Individual factors like genetics, training history, and health conditions can affect accuracy. Consult with healthcare professionals for personalized advice.
Can I share my results?
Yes! Each calculation generates a unique shareable URL that preserves your inputs. You can easily share results with trainers, coaches, or workout partners.
Will my calculation history sync across devices?
No. Since we prioritize privacy and don't collect your data, your calculation history is stored locally in each browser. History won't sync between devices, but you can export your history as CSV for backup.
Which TDEE formula do you use?
We use the Mifflin-St Jeor equation, which is considered one of the most accurate formulas for estimating BMR and TDEE for the general population.
Can I use FitForge offline?
Yes! Once you've visited the site, the service worker caches core pages and calculators, allowing you to use FitForge even without an internet connection.
Looking for more productivity tools? Check out StepWise to smart step and stride calculators.