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Sync settings

Choose what your account keeps in step on every device where you are signed in.

  • My tools

    Always synced: the tools on your board, their order and size.

  • The windows open on your start page, including what you typed in them.

  • Every note in the notepad – on the notepad page, on your board and in windows.

  • Every list of website shortcuts – on the shortcuts page, on your board and in windows.

  • Every grid in the cover grid maker – on its page, on your board and in windows.

  • Every list of bookmarked organisations in the OIN lookup – on its page, on your board and in windows.

  • Keeps your pipeline and saved recipes on all your devices. Your files are never synced – only the steps and settings.

Turning something off removes it from your account straight away. Your devices keep their own copy.

Notifications

Tools that can tell you about something new while a Synsi tab is open, even when you are in another tab or app. Choose them for this browser.

This browser cannot show notifications from websites.
Notifications are blocked for this site. Allow them in your browser’s site settings (the icon left of the address), then switch them on here.

  • Says “New message” while a Synsi tab is open – never who wrote it or what.

Your choice is stored in this browser only. Notifications never show personal content such as a message or a number. They work while a Synsi tab is open; closed tabs get none.

Browse all tools →

Health calculators

Simple health indicators, clearly explained. Informational only – not medical advice.

BMI Calculator

Calculate your body mass index (BMI) in metric or imperial units, see your WHO weight category and the healthy weight range for your height. Free.

Body Fat Calculator

Estimate body fat percentage from age, height, weight and sex with a BMI-based equation. Includes metric and imperial units. Free adult calculator.

TDEE Calculator

Estimate your total daily energy expenditure (TDEE) from age, height, weight and activity level. Includes metric and imperial units. Free adult calorie calculator.

BMR Calculator

Estimate your basal metabolic rate (BMR) from age, height, weight and sex. Supports metric and imperial units. Free adult BMR calculator.

Calorie Calculator

Estimate how many calories you need each day to maintain your weight. Enter your age, height, weight and activity level. Free calculator for adults.

Ideal Weight Calculator

Estimate an adult weight range for your height based on BMI values of 18.5 to 24.9. Includes metric and imperial units and a reference midpoint.

Calorie Deficit Calculator

Estimate maintenance calories and a goal-based daily target from your age, height, weight and activity. Compare BMR formulas and see optional macro estimates.

Protein Intake Calculator

Protein intake by body weight for general, active and athletic adults.

Water Intake Calculator

See a reference for total daily water intake based on life stage.

Waist-to-Height Ratio Calculator

Calculate your waist-to-height ratio as an adult screening measure.

Lean Body Mass Calculator

Estimate fat-free mass from body weight and body-fat percentage.

Calories Burned Calculator

Estimate energy use from body weight, activity and exercise duration.

Running Pace Calculator

Find your pace per kilometre and mile from distance and finish time.

One Rep Max Calculator

Estimate a one-repetition maximum from the weight and repetitions completed.

Heart Rate Zone Calculator

Estimate five training heart-rate zones from age-predicted maximum heart rate.

Sleep Calculator

Choose a wake time and see bedtimes allowing for 7, 8 or 9 hours of sleep.

Due Date Calculator

Estimate a pregnancy due date from the first day of the last menstrual period.

Ovulation Calculator

Estimate ovulation and a fertile window from period date and cycle length.

Pregnancy Weight Gain Calculator

Compare current gain with a singleton pregnancy reference range based on pre-pregnancy BMI.

Understand the numbers

Health calculators give a quick indication based on widely used formulas from organisations such as the World Health Organization. They cannot replace a consultation with a doctor, who can take your full situation into account.