Fitness Calculators

Find the Right Fitness Calculator for Your Training Goal

Picking the wrong calculator wastes training effort. Someone trying to lose fat and someone training for a marathon need completely different numbers — different calorie targets, different heart rate zones, different weekly structures. Use the sections below to find the tools that match your actual situation.

Building Strength and Muscle

If you're training in a gym and want to get stronger, start with the One Rep Max Calculator — it converts any set and rep count to an estimated 1RM, which becomes the baseline for all your percentage-based programming. The Strength Standards Calculator shows where you rank (beginner, novice, intermediate, advanced, elite) for your bodyweight and lift. Once you have a 1RM, the Progressive Overload Calculator plans your weekly weight increases to avoid stalling. For powerlifters, the Powerlifting Total Calculator sums your squat, bench, and deadlift, and the Wilks Score Calculator normalizes that total for bodyweight comparisons across weight classes. The Plate Calculator tells you exactly which plates to load on each side of the bar for any target weight.

Running, Marathon Training, and Cardio

Training for a race? Start with the Running Pace Calculator to convert between pace per mile, pace per kilometer, and race finish times. Use the Marathon Pace Calculator to build a target-time pacing strategy for each mile split. If you're structuring your training by zones, the Heart Rate Zones Calculator divides effort into five zones based on your max heart rate. For tempo work, the Tempo Run Pace Calculator gives you the right pace range — typically 15-20 seconds per mile slower than 5K race pace. Want to predict your finish time for a new distance based on recent race results? Use the Race Time Predictor.

Nutrition, TDEE, and Body Composition

Nutrition planning starts with knowing your maintenance calories. The TDEE Calculator (Total Daily Energy Expenditure) factors in your weight, height, age, sex, and activity level to give you a daily calorie target. From there, the Macro Calculator splits those calories into protein, fat, and carbs based on your goal — cut, bulk, or maintain. The Protein Calculator zooms in specifically on daily protein needs based on body weight and training intensity. Aiming for fat loss? The Calorie Deficit Calculator shows how a given daily deficit translates to weight loss per week. For body fat estimates, the Body Fat Calculator uses circumference measurements, while Lean Body Mass Calculator tracks your muscle mass independently of scale weight.

Cycling, Swimming, and Endurance Sports

Cyclists training by power should start with the Cycling FTP Estimator to establish functional threshold power, then use the Cycling Training Zones Calculator to define Zone 2 and above. The Cycling Power Calculator estimates watts needed for specific speed and grade combinations. For triathletes and swimmers, the Swim Pace Calculator converts between 100m/yd pace and race finish times, and the Swim Training Zones Calculator structures effort by lactate threshold pace. For any endurance athlete, the HRV Training Readiness Calculator helps interpret morning heart rate variability to decide when to push hard and when to recover.

Recovery, Wellness, and Activity Calorie Burn

Recovery is where adaptation actually happens. The Muscle Recovery Estimator tells you how long specific muscle groups need before being trained again at high intensity, based on volume and exercise type. Taking a planned break? The Deload Week Calculator shows how to reduce load and volume without losing fitness. For tracking calorie burn by activity, the Hiking Calorie Calculator, Walking Calorie Calculator, and Jump Rope Calorie Calculator use bodyweight and duration to estimate energy expenditure beyond structured gym sessions.

How to Pick the Right Starting Point

If you're new to tracking fitness numbers, start with the TDEE Calculator to understand your baseline energy needs, then layer in specific tools as your training becomes more structured. Strength athletes should prioritize the One Rep Max Calculator as the foundation for percentage-based programming. Endurance athletes should start with Heart Rate Zones to ensure training intensity distribution is correct — most endurance athletes train too hard on easy days and not hard enough on hard days. For body composition goals, the Macro Calculator combined with the Body Fat Calculator gives you both the target and the baseline measurement to track progress against. All tools support both metric and imperial inputs, so you can work in kilograms or pounds and kilometers or miles depending on your preference. The calculators are intentionally simple — no login, no data storage, no tracking. Enter your numbers, get your answer, and apply it to your training. Numbers in these calculators are reference points, not prescriptions. Adjust based on how you're responding to training over time, and treat any calculation as a starting estimate rather than a fixed target.