"The Alpha Health Insights"

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Heart Rate Zone Calculator widget

Heart Rate Zone Calculator

Find the heart rate ranges to train in, whether you want a healthier heart, to burn fat or to build stamina. You will see exactly how many beats per minute to aim for.

Your age (15 to 90)

Resting heart rate (optional)

Measure your resting heart rate first thing in the morning before getting up. Place two fingers on your wrist, count the beats for 30 seconds and double it. Adding it makes your zones more personal.

What is your main goal? I take heart or blood pressure medicine, or have a heart condition

Maximum heart rate is estimated with the Tanaka formula (208 minus 0.7 times age) and can differ from your true maximum by 10 beats or more. This is educational and not medical advice. See our Editorial Policy. Your entries are not stored.

Daily Water Intake Calculator

Work out how much water you should drink each day, based on your body, your activity and the weather. You will also get a simple plan for the day.

Units

Your weight (kg) Exercise or hard physical work each day (minutes) Your daily environment Are you pregnant or breastfeeding? I have a fever, vomiting or diarrhoea today

This is a general estimate for healthy adults and is not medical advice. See our Editorial Policy. Your entries are not stored.

Sleep Cycle Calculator

Waking up in the middle of a deep sleep cycle leaves you groggy. This tool finds the times that line up with your natural sleep cycles, so you wake up feeling more refreshed.

What do you want to do?

Wake up time Age group

Sleep cycles last about 90 minutes on average and vary between people, so treat these times as a guide within about 15 minutes. We assume you take about 15 minutes to fall asleep. See our Editorial Policy. Your entries are not stored.

"Your Fertility & Pregnancy Companion"

Find your fertile window

Enter the first day of your last period to see your likely ovulation day and fertile days for this cycle.

First day of your last period

Average cycle length (days)

Estimated ovulation day

—

Day 1 Day 28

Fertile window—

Next period expected—

This is an estimate based on average cycle data — real ovulation timing varies. It isn't a substitute for medical advice.

How far along are you?

Use your last period, your conception date, or your due date — whichever you know — to see your due date, current week, and how big your baby is right now.

Last period Conception date Due date

First day of your last period

Average cycle length (days)

Estimated due date

—

Week 0 Week 40

You're in—

Trimester—

Likely arrival window—

Days until due date—

Add due date to calendar

Most babies arrive within two weeks of their due date, so treat this as a guide. Check dates with your doctor or midwife.

How this is calculated

The last-period method adds 280 days to the first day of your last period (Naegele's rule), adjusted for a cycle longer or shorter than 28 days. The conception method adds 266 days to the conception date. Both assume regular cycles and are estimates, not diagnoses.