BMI Calculator
Work out your Body Mass Index in stone, pounds and feet.
Use calculator🌿 Your everyday UK health & fitness toolkit
Clear, friendly calculators for body measurements, nutrition, training, women's health and wellness.
UK focused
⚖️ Stone & lbs
🏃 Miles & min/mile
📱 Mobile friendly
No calculators match that search. Try BMI, sleep, units or a sport.
500+ calculators for health goals
Health Calculators is a definitive list of 500+ calculators for everyday health goals. It is a huge collection of ready-to-use calculators covering topics including body measurements, nutrition, fitness, women's health, family, lifestyle and health checks.
Start from a goal
Pick a journey and open the calculators in a sensible order.
Lose weightCalories, deficits and body checks that work togetherRun a racePace, finish times and training checkpointsSleep betterBedtimes, sleep debt and caffeine timingPregnancyWeeks, due dates and healthy weight gainDrink lessUnits, Dry January and a no-drive warning that stays seriousFeel betterSleep, breaks, outdoor minutes and a worry slotHave a playPizza steps, stair Everest and a workout spirit animalUnderstand a resultUnit converters and careful explainers, then speak to your GP
Browse by topic
A short list of the main tools in each topic. Search finds the rest, and each topic page has the full set.
Body measurements
Understand your body size, composition and proportions using UK friendly units.
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Healthy Weight Calculator
Check whether your weight sits in a healthy range for your height.
Use calculatorBody Fat Calculator
Estimate body fat from neck, waist and hip measurements.
Use calculatorWaist to Height Ratio
A simple check linked to cardiometabolic health risk.
Use calculatorIdeal Weight Calculator
See a healthy weight range based on your height and sex.
Use calculatorCalorie Calculator
Estimate daily calories for weight loss, maintenance or gain.
Use calculatorTDEE Calculator
Total daily energy expenditure based on your activity level.
Use calculatorCalorie Deficit Calculator
Estimate weeks to a weight goal from a daily calorie deficit.
Use calculatorWater Intake Calculator
A practical daily hydration guide in litres and pints.
Use calculatorProtein Calculator
How much protein you may need each day for your goal.
Use calculatorPace Calculator
Convert between pace per mile, speed and finish times.
Use calculator5K Pace Calculator
Work out the pace per mile you need for a 5K finish time.
Use calculatorSteps to Miles Calculator
Turn daily steps into miles and kilometres.
Use calculatorDaily Step Goal Calculator
Set a step target from a walking distance goal in miles.
Use calculatorCalories Burned Calculator
Rough energy burned during common activities.
Use calculatorWalking Pace Calculator
Turn minutes per mile into mph and a finish time for a walk you already have in mind.
Use calculatorWellbeing
Everyday habits: breaks, outdoor time, breathing and streaks. Friendly, not clinical.
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Weekly Wellbeing Score
Score sleep, movement, outdoor time, people and rest out of 50. A habit snapshot, not a mental health test.
Use calculatorOutdoor Minutes
Compare today's outdoor minutes with a daily goal you choose.
Use calculatorWork Break Planner
Split a workday into focus blocks and pauses.
Use calculatorHabit Streak Calculator
See how far you are through a streak you chose.
Use calculatorBox Breathing Planner
Set a box-breathing pattern and how long the session lasts.
Use calculatorMental health
Planning tools and signposting. Not diagnosis, scoring or treatment.
Worry Time Planner
Park worries into a short, timed slot so they do not fill the evening.
Use calculatorBrain and focus
Focus blocks, reading pace and a playful reaction test. Not a cognitive exam.
Focus Session Planner
Plan Pomodoro-style work and break blocks.
Use calculatorCaffeine Focus Window
Pair a caffeine dose with a last-cup time before bed.
Use calculatorReading Speed Calculator
Estimate words per minute from pages and time.
Use calculatorReaction Time Tester
Click when the pad turns green and see your time in milliseconds.
Use calculatorPeriod Calculator
Predict your next period and fertile window.
Use calculatorDue Date Calculator
Estimated due date from the first day of your last period.
Use calculatorOvulation Calculator
Estimate your most fertile days this cycle.
Use calculatorPregnancy Calculator
How many weeks pregnant you are and key milestones.
Use calculatorConception Calculator
Approximate conception date from your due date or LMP.
Use calculatorFamily and life stages
Household challenges, children's sleep ranges and older-adult activity minutes.
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Children's Sleep Time
See a commonly discussed sleep-hours range for a child's age. Not a diagnosis.
Use calculatorFamily Step Challenge
Multiply people by steps for a shared walking total and a rough mile figure.
Use calculatorOlder Adult Activity Minutes
Compare weekly moderate minutes and strength days with common UK older-adult guidance.
Use calculatorAppointment Countdown
Count the days to a clinic or hospital date.
Use calculatorBaby Due Date Countdown
Work out the next due date from the last check you have on record. A reminder only. Your practice books the appointment.
Use calculatorSleep Calculator
What time to go to bed to wake up refreshed.
Use calculatorAlcohol Units Calculator
Add up UK alcohol units across your week.
Use calculatorBAC Calculator
Rough blood alcohol estimate using UK units. Never drink and drive.
Use calculatorSleep Debt Calculator
Add up short sleeps across the week and see what you are owed.
Use calculatorCaffeine Cut-Off Calculator
A sensible last-coffee time before your planned bedtime.
Use calculatorFun and quirky
Shareable calculators: pizza steps, stair Everest, spirit animals and more.
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Pizza to Steps
Turn pizza slices into a tongue-in-cheek step count.
Use calculatorStairs to Everest
How many days of stair flights to match Everest's height.
Use calculatorWorkout Spirit Animal
Answer four training questions and get a spirit animal. For sharing, not psychology.
Use calculatorSessions Left in My Life
A playful count of training sessions if you keep a weekly habit to a chosen age.
Use calculatorSteps to the UK Coast
How many days of your step habit to walk a UK coastline figure.
Use calculatorBlood Pressure Explainer
Place a reading in common NHS-style bands. Not a diagnosis.
Use calculatorHbA1c Converter
Convert mmol/mol and percentage HbA1c. Units only.
Use calculatorGFR Calculator
Estimate kidney function from your blood test results.
Use calculator111 or 999 Chooser
Answer a few emergency-flag questions. If you are unsure, call 999.
Use calculatorCholesterol Ratio
Work out cholesterol ratio in familiar units. Guidance, not diagnosis.
Use calculator