Fitness & Performance
Calculators.
Free precision tools — no signup, no ads.
TDEE Calculator
Find your Total Daily Energy Expenditure for weight management
Heart Rate Zones
Find your training heart rate zones for cardio fitness
Pace Calculator
Calculate running or walking pace, speed, and finish time
One Rep Max Calculator
Estimate your one-rep max from submaximal lifts
Army Body Fat Calculator
Calculate body fat using U.S. Army tape test standards
Steps to Calories
Convert daily step count into calories burned
Calories Burned Calculator
Estimate calories burned for 100+ activities using MET values, body weight, and duration
VO2 Max Calculator
Estimate your VO2 max aerobic fitness level
Cycling FTP Calculator
Calculate your cycling FTP and power training zones
FFMI Calculator
Calculate fat-free mass index to assess muscle development
Hydration Calculator
Personalized fluid intake, electrolyte needs, and drinking schedules for athletes
Cycling Power-to-Weight Ratio
Calculate cycling watts per kg and FTP performance
Swim Pace Calculator
Calculate swim pace per 100m and predict finish times
Wilks Score Calculator
Calculate Wilks and DOTS scores for powerlifting
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How this page is reviewed
| Risk tier | YMYL |
|---|---|
| Author | Calculover Editorial Team Health education |
| Editorial owner | Calculover Nutrition & Fitness Desk Wellness methodology owner |
| Reviewer | Calculover Editorial Review Medical-source review |
| Last reviewed | 2026-05-11 |
| Last verified | 2026-05-11 |
| Data effective date | 2026-05-11 |
Methodology
Fitness Performance Resource uses the formula or training model documented on the page, such as age-based heart-rate zones, pace conversion, estimated energy cost, power-to-weight ratio, or one-rep-max estimation. Outputs are training estimates intended to help users plan intensity, not clinical exercise clearance.
Assumptions
- Inputs such as age, distance, duration, weight, load, heart rate, and perceived effort are measured consistently and entered in the selected units.
- Age-predicted heart-rate and performance formulas describe averages and can differ meaningfully from measured laboratory or coach-supervised testing.
- The user is healthy enough for the selected activity and will adjust intensity for heat, altitude, injury status, medications, and current conditioning.
Limitations
- Exercise estimates may be unreliable for users with cardiovascular disease, pregnancy, recent illness, injury, heat illness risk, medications that affect heart rate, or symptoms such as chest pain or fainting.
- One-rep-max, power, pace, and calorie formulas do not account for technique, fatigue, terrain, equipment, hydration, sleep, or injury history.
- Use conservative loads and intensities; stop activity and seek medical help for severe shortness of breath, chest pain, fainting, or symptoms that feel unusual.
Sources
- Target Heart Rates Chart, American Heart Association
- How to Measure Physical Activity Intensity, Centers for Disease Control and Prevention
- Physical Activity Fact Sheet, World Health Organization
Professional guidance: Fitness Performance Resource supports fitness planning only and is not medical advice, diagnosis, rehabilitation, or exercise clearance. Ask a healthcare professional about safe activity levels if you have symptoms, chronic conditions, pregnancy, medication concerns, or recent injury.