Log a day of food for kilojoules, calories and macros; check it against your daily energy need (RDA) and your BMI.
What did you eat today?
Food
Amount
kcal
No foods added yet.
Today's totals
0 kcal
0 kJ
Protein0 g · 0%
Carbs0 g · 0%
Fat0 g · 0%
About you
Your daily energy need (RDA)
0
kcal / day · 0 kJ
Eaten today0 kcal
Daily need0 kcal
BMI & healthy weight
0
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How this calculator works — and its limits
Method & assumptions
Daily energy need is estimated with the Mifflin-St Jeor equation (a widely used, published
formula), multiplied by your selected activity level.
Food values are per-100g composition figures typical of standard food-composition tables; brands and
preparation methods vary, so logged totals are estimates.
All outputs are population-level estimates — individual metabolism can differ by several hundred kcal/day.
BMI is a screening measure, not a diagnosis
BMI cannot distinguish muscle from fat — it over-reads for muscular people and can
under-read for older adults with low muscle mass.
It is not valid in pregnancy, and children need age-adjusted centile charts, not this scale.
Health risk can start at lower BMI values for people of South Asian, Chinese, other Asian, Middle Eastern,
Black African or African-Caribbean backgrounds (NHS uses 23 rather than 25 as the overweight threshold).
Concerned about your weight or energy needs? A GP or registered dietitian can assess properly — this tool
can't account for medical conditions or medications.
VitaWhat is an educational reference only. It is not medical advice and is not authoritative. Always consult a qualified healthcare professional before making changes to your diet, supplements or treatment. See how this content is produced in our editorial policy; report an error via the contact page.