Free nutrition calculators and quizzes built on published sources: a BMI calculator with WHO and NHS cut-offs, a calorie calculator using the FAO/WHO/UNU equations, EFSA protein and water targets, the WHO fibre target, a waist-to-height check, two quizzes and a country comparison. Every result can be taken straight into a booking.
BMI calculator
Work out your body mass index, see which WHO category it falls in, and get the healthy weight range for your height.
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Calorie calculator
Estimate your basal metabolic rate and your daily energy needs as a range, using the equations from the FAO/WHO/UNU expert consultation.
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Protein calculator
Enter your weight and get your daily protein reference intake in grams, based on the European Food Safety Authority's value for adults.
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Water intake calculator
See your daily water target from the European Food Safety Authority's adequate intakes, and how it compares with the NHS guidance on drinks.
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Fibre target
Find the WHO fibre target for your age group and, if you know roughly how much you eat now, how big the gap is.
Open →Waist-to-height ratio
One tape measure, one number: check whether your waist is less than half your height, as the NHS advises.
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Which professional do I need?
Five quick questions match you with the right kind of professional and session, and take you straight to booking.
Open →Healthy eating check
Eight everyday questions, scored against the World Health Organization's healthy diet advice, with a tip for every answer.
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Compare two countries
Regulation, credentials, supplement rules and numbers side by side.
Open →For the bigger picture behind every number, see the WHO healthy diet fact sheet and the NHS Eatwell Guide. New tools are announced in the monthly newsletter.
Why these tools are different
Most nutrition calculators online do not say where their numbers come from. Every tool here names its source on the page: WHO, the FAO/WHO/UNU expert consultation, the European Food Safety Authority and the NHS. Results are shown as ranges where the science gives a range, and every page explains what the number cannot tell you.
Private by design
The calculators run in your browser. Nothing you enter is sent to us unless you decide to book a session and attach your result.
From number to plan
A number is a starting point. If a result surprises you, or you want a plan built around your health, culture and budget, book a session with a professional from our network.
Book a video, phone or in-person session with a professional from our network. Your result can be attached so you do not start from scratch.
