About this nutrition calculator
Estimate adult daily energy needs from height, weight, age, the selected formula sex coefficient, and an activity multiplier. Set protein and fat percentages to see an illustrative split in grams, with carbohydrates taking the remainder. This general tool is for adults aged 18 and over and is not a meal plan. It is not suitable for pregnancy, breastfeeding, eating disorders, medical conditions, or decisions about medication or supplements.
How the nutrition calculator works
The simplified Mifflin–St Jeor equation is 10 × kg + 6.25 × cm − 5 × age, plus 5 for the male coefficient or minus 161 for the female coefficient. Resting energy is multiplied by the chosen activity factor. Protein and carbohydrate use 4 kcal/g; fat uses 9 kcal/g.
Nutrition Calculator examples
Male coefficient, 70 kg, 175 cm, 30 years, factor 1.2
1,648.75 resting kcal; 1,978.50 daily kcal
2,000 kcal at 20% protein / 30% fat / 50% carbohydrate
100 g protein; 66.67 g fat; 250 g carbohydrate
Limitations & privacy
General estimates only, not diagnosis, treatment, or an individualized diet. Activity multipliers are rough assumptions. Consult a qualified healthcare professional for decisions affecting health. Formula content awaits human review before indexing.
Inputs and results stay in this browser. Only tool identifiers are stored for your recently used tools. You can clear that history from the directory.
Formula reference: Mifflin et al., 1990. Source checked September 12, 2026. Activity multipliers are illustrative assumptions, separate from the resting-energy equation.
Nutrition Calculator: frequently asked questions
Is this a weight-loss plan?
No. The output estimates maintenance energy under the assumptions you choose.
Why does the formula ask for sex?
The original equation has two sex coefficients. This is a model limitation, not a complete description of individual physiology.
Can children or pregnant people use it?
No. Their needs require a different assessment with an appropriate professional.
Updated September 20, 2026