Disclaimer
HealthTools provides arithmetic derived from published formulas. It is not medical advice, not a diagnosis, and not a treatment recommendation.
Outputs are population estimates and can be wrong for you specifically, particularly if you are pregnant, under 18, over 65, taking medication that changes heart rate or drug metabolism, or living with liver, kidney or cardiovascular disease.
Pregnancy, ovulation and blood-pressure tools involve clinical interpretation and are not suitable for clinical decisions. Discuss anything that affects your health with a qualified clinician.
Where a formula has a known standard error, the page states it. Where a formula is disputed, the page shows the competing values instead of picking one.
Emergencies are never a calculator question. If you have chest pain, a sudden severe headache, fainting, or a blood pressure reading far outside the usual range with symptoms, get emergency care rather than looking for a number here.