Body and weight
BMI, waist to height, body fat and a healthy weight for your height.
BMIWaist to height ratioBody fat
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474 free UK health calculators
UK health calculators, checked against NHS guidance.
Type in your numbers for BMI, calories, sleep, due dates and more. Every answer is checked against NHS and NICE guidance.
Start with your BMI
Your BMI
24.1
In the healthy range
That is in the healthy range for your height. Nice. BMI is one number, not the whole picture, but it is a good one to have.
A healthy weight for 5 ft 7 in is about 8 st 6 lb to 11 st 5 lb.
What your result meansOr work out:CaloriesDue dateSleepAlcohol unitsRunning pace
Pick a topic
Choose a topic to see all of its calculators.
Fitness and running
Pace, heart rate zones, steps and finish times for your next 5K.
PaceTarget heart rateSteps to miles
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Pregnancy and periods
Due dates, pregnancy weeks, ovulation and cycle length.
Due datePregnancy weekOvulation
See all 33
Sleep, drinks and habits
Bedtimes, alcohol units, caffeine cut-offs and what smoking costs you.
SleepAlcohol unitsCaffeine cut off
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Health checks
Blood pressure, HbA1c and cholesterol results explained in plain English.
Blood pressure explainerHbA1c converterCholesterol ratio
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Wellbeing and focus
Breathing, breaks, outdoor minutes and focus.
Box breathing timerOutdoor minutesFocus sessions
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Family and later life
Children's sleep, activity for older adults and family step challenges.
Children's sleepActivity for older adultsFamily step challenge
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Just for fun
Stairs to Everest, pizza to steps and how many 5Ks to the Moon.
Stairs to EverestPizza to steps5Ks to the Moon
See all 65Start from a goal
Not sure which calculator you need? Pick what you are aiming for and we will walk you through it.
Reach a healthy weightA steady plan: your healthy weight range, your calorie number and small changes that last.
Run a racePlan a race: pace, finish times, heart rate zones and a sensible training build up.
Sleep betterBedtimes that fit your cycles, a caffeine cut off and the habits NHS sleep advice is built on.
PregnancyYour due date, the week you are in, caffeine, weight and the first things to sort.
Drink lessUnits, drink free days and the money and sleep you get back.
Feel betterSmall, steady habits for a better week: breathing, daylight, breaks and somewhere to put the worries.
Have a playFun sums with real numbers: stairs to Everest, sugar bags and steps round the coast.
Understand a resultGot a number back from a test? Plain English help with blood pressure, HbA1c, kidneys and more.
Popular calculators
The ones most people come looking for.
BMI calculatorStone or kilos, NHS bands and the NICE lower thresholds.
Calorie calculatorYour everyday energy number, with safe floors built in.- Due date calculatorYour estimated due date from the first day of your last period.
Sleep calculatorBedtimes that let you wake between sleep cycles, not halfway through one.- Alcohol units calculatorPints, glasses and measures into UK units, against the 14 unit guideline.
Pace calculatorMinutes per mile or kilometre for your next parkrun or race.- Waist to height calculatorNICE says keep your waist under half your height. Check yours with a tape.
Water intake calculatorA daily fluid guide in litres and pints. Tea, coffee and milk all count.
Health numbers at a glance
The UK guidance behind our calculators, and what each number looks like in real life.
- 18.5 to 24.9healthy BMI range for most adultsFor someone 5ft 9in (175 cm), that is about 8st 13lb to 12st (57 to 76 kg).NICE NG246Work out your BMI
- 23 and 27.5lower BMI thresholds for some family backgroundsOverweight and obesity start lower for people of South Asian, Chinese, other Asian, Middle Eastern, Black African or African-Caribbean family background.NICE NG246Check your BMI with the lower thresholds
- Under 0.5waist to height ratio to aim forKeep your waist under half your height. At 5ft 9in (175 cm), that is under 87.5 cm (about 34 in).NICE NG246Work out your waist to height ratio
- 14 unitsa week, at most, for men and womenAbout 6 pints of average-strength beer or 10 small glasses of lower-strength wine a week, spread over 3 or more days.UK Chief Medical OfficersCount your alcohol units
- 150 minutesof moderate activity a week for adultsThat is 30 minutes, 5 days a week. A brisk walk counts.UK Chief Medical OfficersAdd up your exercise minutes
- 30gof fibre a day for adultsMost UK adults get about 20g a day.SACN and the NHSWork out your fibre
How we look after you
- 1Plain wordsResults are described plainly. Bodies come in all shapes.
- 2Real sourcesEvery number comes from the NHS, NICE, the UK Chief Medical Officers or SACN, and we link to them.
- 3Private by designThe sums happen on your device. Nothing you type is sent or saved.
- 4Someone to talk toA number is only a start. Your GP, a pharmacist or NHS 111 can help with the rest.
Sources: NHS, NICE NG246, UK Chief Medical Officers, SACN. Last checked 21 October 2026. How we check our sums