Health & Lifestyle Calculators

4 calculators Updated for tax year 2026/27 Topic hub All calculators

BMI, calories, water intake and BMR — fast lifestyle estimates, no login, no judgment.

BMI Calculator

Work out your Body Mass Index, your weight category and the healthy weight range for your height.

Estimate your daily calorie needs from your BMR and activity level.

Work out your basal metabolic rate — the calories your body burns at complete rest.

Estimate your daily water intake target from your weight and activity.

Guides

New to the topic? Start with a plain-English guide, then put the numbers into the calculators above.

How to create a simple 50/30/20 budget that splits your after-tax income into needs, wants and savings — and actually stick to it.