More Than a Calculators
Health & Fitness Calculators
Calories, macros, body metrics, workouts, and everyday wellness—use these fast calculators to plan, compare, and track progress in seconds.
Tip: Try “calorie deficit”, “net carbs”, “waist”, “VO2”, or “heart rate zone”.
Calories & Nutrition Calculators
Macros, calories, carbs, and nutrition planning tools.
Calorie Calculator
Daily calories to maintain, lose or gain weight.
Calorie Deficit Calculator
Set a deficit target based on your goal and timeline.
Calorie Surplus Calculator
Plan a surplus for lean gain and bulking.
Carbohydrate Calculator
Plan carbs and macros for your diet style.
Diet Risk Score Calculator
Score your eating pattern against common diet-quality markers.
Fiber Calculator
Daily fibre target from age, sex and calories.
Glycemic Index Calculator
Glycaemic index of a food from its glucose response.
Glycemic Load Calculator
Glycaemic load of a serving from GI and carbohydrate.
Keto Calculator
Plan carbs and macros for your diet style.
Lean Gains Macro Calculator
Plan carbs and macros for your diet style.
Meal Calorie Calculator
Calories in a meal from its macronutrient grams.
Net Carbs Calculator
Plan carbs and macros for your diet style.
Protein Intake Calculator
Plan daily protein and per-meal targets.
Protein Per Meal Calculator
Plan daily protein and per-meal targets.
Protein Timing Calculator
Plan daily protein and per-meal targets.
TDEE By Fitness Goal
Estimate daily maintenance calories from activity level.
TDEE Calculator
Estimate daily maintenance calories from activity level.
Body Metrics & Goals
Track body composition, healthy ranges, and progress toward a goal.
Body Fat Calculator
Estimate body fat percentage from common methods.
Body Recomposition Calculator
Calories and protein to lose fat while keeping muscle.
Body Shape Type Calculator
Body shape from bust, waist and hip measurements.
Body Water Calculator
Total body water estimate from weight, height, age and sex.
BMI Calculator
Body mass index and weight category for adults.
Healthy Weight Calculator
Healthy weight range for your height by BMI.
Ideal Body Fat Percentage Calculator
Estimate body fat percentage from common methods.
Ideal Weight Calculator
Ideal body weight by Devine, Robinson, Miller and Hamwi formulas.
Waist To Height Ratio Calculator
Assess health risk using waist ratios.
Waist To Hip Ratio Calculator
Assess health risk using waist ratios.
Water Weight Loss Calculator
Fluid lost during exercise and how much to drink back.
Weight Loss Percentage Calculator
Percentage of body weight lost between two weigh-ins.
Fitness & Cardio
Heart rate, VO2 max, pace, and fitness test calculators.
ACFT Calculator
Army Combat Fitness Test score from six event results.
APFT Calculator
Army Physical Fitness Test score by age and sex.
Calories Burned Calculator
Estimate calories burned from activity, pace, and time.
Cycling Calories Burned Calculator
Estimate calories burned from activity, pace, and time.
Heart Rate Calculator
Calculate heart-rate targets and recovery metrics.
Heart Rate Recovery Calculator
Calculate heart-rate targets and recovery metrics.
Heart Rate Zone Calculator
Calculate heart-rate targets and recovery metrics.
Maximum Heart Rate Calculator
Calculate heart-rate targets and recovery metrics.
Pace To Speed Converter
Convert running pace per km or mile into speed.
Running Pace Calculator
Pace, time or distance for a run from the other two.
Step Calorie Calculator
Calories burned from step count, weight and stride.
Swimming Calories Burned Calculator
Estimate calories burned from activity, pace, and time.
VO2 Max Calculator
Estimate VO2 max using simple test inputs.
VO2 Max Step Test Calculator
Estimate VO2 max using simple test inputs.
VO2 Max Walking Test Calculator
Estimate VO2 max using simple test inputs.
Hydration
Water intake and hydration status tools.
Health Labs
Common lab and clinical calculations (informational only).
Anion Gap Calculator
Anion gap from sodium, chloride and bicarbonate.
Arterial Age Calculator
Estimated vascular age from blood pressure and risk factors.
Basal Insulin Dose Calculator
Compute a common lab metric from your inputs.
Blood Sugar Converter
Compute a common lab metric from your inputs.
BSA Calculator
Compute a common lab metric from your inputs.
BSA Mosteller Vs Dubois Comparison
Compute a common lab metric from your inputs.
Cholesterol Converter
Convert cholesterol between mg/dL and mmol/L.
Corrected Calcium Calculator
Compute a common lab metric from your inputs.
Corrected Sodium Calculator
Sodium corrected for high blood glucose.
Creatinine Clearance Calculator
Compute a common lab metric from your inputs.
Creatinine Unit Converter
Convert creatinine between mg/dL and µmol/L.
eGFR CKD EPI 2021
Compute a common lab metric from your inputs.
Hemoglobin A1C To EAG Converter
Compute a common lab metric from your inputs.
LDL HDL Ratio Calculator
Compute a common lab metric from your inputs.
Mean Arterial Pressure (MAP) Calculator
Compute a common lab metric from your inputs.
Serum Osmolality Calculator
Serum osmolality from sodium, glucose and urea.
Pregnancy & Reproductive
Pregnancy timelines and cycle/ovulation calculators.
Alcohol
BAC and alcohol clearance calculators.
Popular Health & Fitness Calculators
Common starting points for most people.
Health & Fitness Calculators FAQ
Quick answers to the most common questions.
Which calculator should I start with?
Most people start with the Calorie Calculator or TDEE Calculator, then use BMI, Body Fat, and Protein Intake tools to refine a plan.
Are these results medical advice?
No—these tools are for education and planning. If you have a medical condition, use lab calculators only with guidance from a clinician.
Why do different calculators give different answers?
Methods use different formulas and assumptions (age, activity, measurement method, rounding). Use one method consistently to track change over time.
How do I set a calorie deficit safely?
Use the Calorie Deficit / Weight Loss tools to test scenarios, then choose a gradual target you can stick to and adjust based on real progress.
What should I use to plan protein?
Start with Protein Intake, then use Protein Per Meal and Protein Timing calculators to spread it across the day.
Which calculators help with cardio training?
Heart Rate Zone, Maximum Heart Rate, VO2 Max, Running Pace, and Calories Burned calculators are the most useful for cardio planning.
More health and fitness calculators
Further tools in this category that were not listed above.
Calorie Intake Calculator
Daily energy needs by Mifflin-St Jeor and activity level.
Macronutrient Calculator
Split daily calories into carbohydrate, protein and fat grams.
Height in Inches Calculator
Convert feet and inches or centimetres to total inches.
Meat Weight Loss after Cooking Calculator
Cooked weight of meat from raw weight and method.
Parkland Formula Calculator
Burn fluid resuscitation volume by the Parkland formula.
Gout Diagnosis Calculator
Gout probability score from clinical criteria.
Warsaw Method Calculator
Warsaw method score for gout diagnosis without joint aspiration.
Bee Calculator
Basal energy expenditure by the Harris-Benedict equation.
Katch Mcardle Calculator
BMR from lean body mass by the Katch-McArdle formula.
Daily Vitamin Intake Calculator
Recommended daily amounts of eleven vitamins by age and sex.
A G Ratio Calculator
Albumin to globulin ratio from a blood protein panel.
Bra Size Calculator
Band and cup size from several bust and underbust measurements.
BMI Percentile Converter
BMI percentile for children and teens from CDC data.
Jet Lag Recovery Calculator
Days to adjust after a flight across time zones.
Life Expectancy Calculator
Estimated life expectancy from age, sex and lifestyle.
Dog Calorie Needs Calculator
Daily calories for a dog by weight, age and activity.
Dog Feeding Calculator
How much food to give a dog per day and per meal.
Cat Feeding Calculator
Daily food amount for a cat by weight and condition.
Dog Heat Cycle Calculator
Expected dates of a dog's next heat cycle.
Cat Pregnancy Calculator
Due date and stages of a cat's pregnancy.
Fertility Window Probability Calculator
Conception probability by day of the cycle.
Stride Length Calculator
Stride length from height, or from distance and steps.
Step Length Calculator
Step length from height and sex for pedometer settings.
Frame Size Calculator
Small, medium or large body frame from wrist and height.
Resting Metabolic Rate RMR Calculator
Resting metabolic rate by the Mifflin-St Jeor equation.
Body Surface Temperature Calculator
Skin temperature estimate from core and ambient temperature.
IVF Due Date Calculator
Due date from an IVF transfer date and embryo age.
Pregnancy Weight Gain Calculator
Recommended weight gain range by pre-pregnancy BMI.
Dog Age Calculator
Dog age in human years by breed size.
Cat Age Calculator
Cat age in human years.
Dog Pregnancy Calculator
Due date and milestones of a dog's pregnancy.
Met Calculator
Calories burned from MET value, weight and time.
Carb Calculator
Daily carbohydrate grams for your calories and goal.
Period Calculator
Next period dates from your last period and cycle length.
Conception Calculator
Likely conception date from a due date or last period.
GFR Calculator
Kidney filtration rate from creatinine, age and sex.
Body Type Calculator
Ectomorph, mesomorph or endomorph from body measurements.
Overweight Calculator
How far above a healthy weight range you are, in kg or lb.
Fat Intake Calculator
Daily fat grams for your calories and diet style.
Lean Body Mass Calculator
Lean body mass by the Boer, James or Hume formula.
Army Body Fat Calculator
Body fat by the U.S. Army tape method.
Blood Pressure Range Calculator
Blood pressure category from systolic and diastolic readings.
Marathon Time Predictor
Predicted marathon time from a recent race result.
Sleep Debt Calculator
Hours of sleep owed after a week of short nights.
One Rep Max Calculator
One-rep max from a weight lifted for several reps.
BBT Calculator
Ovulation from basal body temperature readings.
Macro Calculator
Carbohydrate, protein and fat grams for your goal.
Due Date Calculator
Pregnancy due date from last period or conception date.
BMR Calculator
Basal metabolic rate by Mifflin-St Jeor or Harris-Benedict.
Sleep Calculator
Best bedtimes and wake times from 90-minute sleep cycles.