Precision calculators for athletes and coaches.
Science-backed running, strength, and nutrition utilities with instant results, dark mode, and mobile-first layouts.
Running Pace Calculator
Calculate your running pace, speed, and finish time for any distance.
TDEE Calculator
Calculate your Total Daily Energy Expenditure using the Mifflin-St Jeor equation.
BMI Calculator
Calculate your Body Mass Index from weight and height with health classification.
1 Rep Max Calculator
Estimate your one-rep max using Epley, Brzycki, Lombardi, O'Conner, and Lander formulas.
Toolbox
All calculators
48 tools across 10 categories.
Running
Running Pace Calculator
→Calculate your running pace, speed, and finish time for any distance.
Running Splits Calculator
→Generate per-kilometre and per-mile split times for your target race pace.
Split Calculator
→Calculate even or negative splits for any race distance and goal time.
Interval Calculator
→Calculate interval times, rest periods, and total workout duration for structured training.
VDOT Calculator
→Estimate your VDOT score and training pace zones from a recent race time.
Race Time Predictor
→Predict your finish time for any race distance using a recent performance and the Riegel formula.
VO2 Max Calculator
→Estimate your VO2 max and aerobic fitness category from a timed running distance.
Calories
Rowing Calories Calculator
→Estimate calories burned during rowing based on weight, duration, and intensity.
Swimming Calories Calculator
→Estimate calories burned swimming based on stroke, weight, and duration.
Treadmill Calorie Calculator
→Estimate calories burned on the treadmill using speed, incline, weight, and duration.
Walking Calorie Calculator
→Estimate calories burned walking based on your weight, pace, and distance.
Running Calories Burned Calculator
→Estimate total calories burned running based on weight, distance, and pace.
Bike Calorie Calculator
→Estimate calories burned cycling based on weight, duration, and effort level.
Steps to Calories Calculator
→Convert daily step count into estimated calories burned based on your weight.
Body Composition
Body Fat Calculator
→Estimate your body fat percentage using the US Navy tape measurement method.
Lean Body Mass Calculator
→Calculate your lean body mass using the Boer formula from weight and height.
BMI Calculator
→Calculate your Body Mass Index from weight and height with health classification.
Ideal Weight Calculator
→Find your ideal weight range using Devine, Hamwi, Robinson, and Miller formulas.
Waist-to-Height Ratio Calculator
→Calculate your waist-to-height ratio and assess cardiovascular health risk.
Waist-to-Hip Ratio Calculator
→Calculate your waist-to-hip ratio and determine health risk classification.
Body Measurement Calculator
→Estimate body composition from girth measurements using established formulas.
Body Recomposition Calculator
→Project changes to fat mass and lean mass over time with a recomposition plan.
Activity
Strength
Barbell Calculator
→Calculate the weight plates needed on each side of a barbell for any target load.
Plate Weight Calculator
→Find the exact plate combination needed to load a barbell to your target weight.
Powerlifting Calculator
→Calculate your Wilks, DOTS, and IPF GL scores to compare strength across weight classes.
1 Rep Max Calculator
→Estimate your one-rep max using Epley, Brzycki, Lombardi, O'Conner, and Lander formulas.
Training Volume Calculator
→Calculate total training volume in sets, reps, and tonnage for any workout.
Strength Ratio Calculator
→Assess your push, pull, and leg strength ratios relative to your bodyweight.
RPE Calculator
→Predict your working weight or rep count at any RPE based on your training max.
Calisthenics
Push-Up Calculator
→Calculate push-up volume, relative strength, and weekly progression targets.
Pull-Up Calculator
→Calculate pull-up volume, weighted equivalents, and progression milestones.
Home Workout Generator
→Generate a structured bodyweight workout plan based on your goal and available equipment.
Nutrition
Fat Intake Calculator
→Calculate your optimal daily fat intake in grams based on total calorie targets.
Creatine Calculator
→Calculate your daily creatine maintenance dose and loading phase amounts by bodyweight.
Protein Powder Calculator
→Find out how many protein powder scoops you need to hit your daily protein target.
Bulk Calculator
→Calculate daily calorie intake for a controlled bulk based on TDEE and surplus size.
Lean Bulk Calculator
→Calculate calories for a lean bulk with capped surplus to minimise fat gain.
Intermittent Fasting Calculator
→Calculate your eating and fasting windows based on your chosen IF protocol.
TDEE Calculator
→Calculate your Total Daily Energy Expenditure using the Mifflin-St Jeor equation.
Starbucks Macro Calculator
→Look up calories, protein, carbs, and fat for popular Starbucks drinks and food items.
Carnivore Macro Calculator
→Calculate your macro targets on a carnivore diet from your weight and goals.
Subway Macro Calculator
→Find the calories, protein, carbs, and fat in your custom Subway order.
Planners
Accuracy
Pure TypeScript formulas
All calculations live in isolated, testable functions for predictable results.
Speed
Instant URL-based state
Forms sync with URL params so you can bookmark and share calculations effortlessly.
Design
Minimal, premium UI
Geist type, glassmorphism cards, and motion cues keep the focus on your metrics.