Health & Wellbeing Calculators
Quick everyday wellbeing tools — work out your BMI, calorie needs, hydration, weekly alcohol units, sleep window or pregnancy due date.
Tools & checkers
All calculators →BMI Calculator
Body Mass Index using NHS thresholds with metric or imperial input.
Start checkCalorie Calculator
Daily maintenance calories using the Mifflin-St Jeor formula.
Start checkWeight Loss Calculator
Weekly deficit needed to hit a target weight by a target date.
Start checkIdeal Weight Calculator
Healthy weight range for your height (Devine, BMI 18.5-24.9).
Start checkWater Intake Calculator
Daily fluid target based on body weight and activity.
Start checkAlcohol Units Calculator
Weekly UK alcohol units against the 14-unit guideline.
Start checkSleep Calculator
Bedtime and wake-time aligned to 90-minute sleep cycles.
Start checkPregnancy Due Date Calculator
Estimated due date and trimester from LMP or conception date.
Start checkProtein Intake Calculator
Daily protein target in grams based on weight, activity and goal.
Start checkKeto Macro Calculator
Daily fat / protein / carb targets for a ketogenic diet.
Start checkRunning Pace Calculator
Convert pace to finish times for 5K, 10K, half and marathon.
Start checkHeart Rate Zone Calculator
Training zones from age (Tanaka) or measured max HR.
Start checkMenopause Symptom Checker
Symptom tally to bring to your GP appointment.
Start checkBlood Pressure Checker
NHS / NICE BP categories from a clinic or home reading.
Start checkBody Fat Calculator
US Navy method body fat % from waist, neck and height.
Start checkBMR Calculator
Basal Metabolic Rate using Mifflin-St Jeor.
Start checkTDEE Calculator
Total Daily Energy Expenditure with activity multipliers.
Start checkMacro Calculator
Protein/fat/carb grams from calories and goal.
Start checkOvulation Calculator
Ovulation date and 6-day fertile window.
Start checkPregnancy Weight Gain
Healthy gain range by pre-pregnancy BMI (IOM guidance).
Start checkPopular questions
In-depth Health articles
Long-form, plain-English guides researched for UK readers.
BMI vs Body Fat: What the Numbers Actually Tell You
Plain-English 2026 guide to BMI, body fat %, waist-to-height ratio and the NHS healthy weight range — what each measure means and where it falls short.
Read guideUK Alcohol Guidelines: What 14 Units Really Looks Like
Plain-English 2026 guide to UK alcohol guidelines — the 14-unit weekly limit, what counts as a unit, how to spread drinks safely, and what to do if you want to cut down.
Read guideNeed help after using a checker?
Where appropriate, Checks Out can help you understand the type of professional you may need, such as a solicitor, broker, adviser, installer, relocation agent or property specialist.
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