Health checks
Understand blood pressure, blood sugar, cholesterol and kidney results in plain English, plus reminders for screening and jabs.
Featured calculator
Blood pressure explainer
Put in the two numbers from your reading and see what they mean, using the same categories the NHS uses. Plain words, no alarm bells.
Explain my readingTakes about a minute
Most used
Where most people start
The four health checks calculators that get the most use.
Search
Search health checks
Only searches the 29 calculators in this topic.
Everything
All 29, sorted into shelves
Grouped by what you want to find out. Every one is in the new design.
Blood pressure and heart2
Blood sugar and HbA1c2
Cholesterol3
Kidneys and liver5
Screening, jabs and reminders9
Other results8
Blood pressure and heart
Readings, categories and resting heart rate.
2 calculators2 in the new design
Blood sugar and HbA1c
HbA1c units and average glucose.
2 calculators2 in the new design
Cholesterol
Ratios and what the letters mean.
3 calculators3 in the new design
Kidneys and liver
GFR, creatinine and liver results.
5 calculators5 in the new design
- eGFReGFR from creatinine, the UK lab equation.Open
- Creatinine converterCreatinine between UK and US units.Open
- Kidney result explainerYour G and A code on the NICE grid.Open
- Urine ACR explainerA1, A2 or A3 from your urine test.Open
- Liver enzyme explainerALT and AST against your lab's range, plus FIB-4.Open
Screening, jabs and reminders
When your next check or jab is due.
9 calculators9 in the new design
- Health review dateWhen your next review or Health Check is due.Open
- Vaccine due dateLast dose plus the gap you were given.Open
- Free flu jab checkerAre you on the free list this winter?Open
- Autumn COVID vaccine checkerEligible this autumn? And from when?Open
- Bowel screening age checkerWhen the home test kit starts for you.Open
- Cervical screening dateNext screening, from your last test.Open
- Breast screening dateFirst invite window, and the next one.Open
- Eye test due dateNext eye test, and free test check.Open
- Dental check up dateYour next check up, within NICE limits.Open
Other results
Fever, oxygen, peak flow and more.
8 calculators8 in the new design
- 111 or 999 chooserTick what is happening, see who to call.Open
- Peak flow personal bestYour best, with amber and red lines.Open
- Peak flow zoneToday's peak flow as a % of best.Open
- Temperature converterC and F, with the NHS fever lines.Open
- Oxygen level checkerYour SpO2 against the NHS lines.Open
- Iron blood test converterIron units, and the ferritin line.Open
- Vitamin D converterng/mL and nmol/L, with the NICE bands.Open
- Medicine timing plannerTimes only, never amounts.Open
Good to know
Where the numbers come from
About these numbers
Guidance, not a diagnosis
These tools explain results, they do not diagnose. The same number can mean different things for different people, which is why your GP or practice nurse should always talk you through a result.
Sources
Where we get them
- NHSHealth A to Z and the NHS BMI calculator
- NICE NG246Overweight and obesity guideline, 2025
- UK Chief Medical OfficersPhysical activity and alcohol guidelines
- SACNScientific Advisory Committee on Nutrition
Last checked 21 October 2026. Each calculator lists its own sources too.
Help
Talk your results through
If a result worries you, book a chat with your GP or practice nurse, or ask a pharmacist. Call NHS 111 if you feel unwell and are not sure what to do, and 999 in an emergency.
Goals
Got a goal in mind?
Guided plans that walk you through the right calculators in the right order, with NHS guidance along the way.
Understand a result