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TDEE Calculator

Estimates total daily energy expenditure from Mifflin-St Jeor BMR and an activity level, and derives calorie targets for maintaining, losing or gaining weight.

When to use

You need daily maintenance calories for an adult, or calorie targets for a mild/standard deficit or surplus.

Do not use when: The person is a child, pregnant or breastfeeding, or you only need the resting rate (use bmr).

Formula

TDEE = BMR(Mifflin-St Jeor) × activity_multiplier; targets = TDEE ± 250 or ± 500 kcal/day

Inputs

Parameter	Type	Unit	Required	Description
`sex`	enum: male \| female		yes	Biological sex used to select the formula coefficients.
`weight_kg`	number	kg	yes	Body weight in kilograms. Range: > 0, ≤ 700
`height_cm`	number	cm	yes	Height in centimetres. Range: ≥ 50, ≤ 300
`age_years`	number	years	yes	Age in years. Range: ≥ 18, ≤ 120
`activity_level`	enum: sedentary \| light \| moderate \| very_active \| extra_active		default moderate	Weekly exercise level; maps to the standard activity multipliers 1.2 / 1.375 / 1.55 / 1.725 / 1.9.

Outputs

Output	Type	Unit	Description
`bmr_kcal_per_day`	number	kcal/day	Mifflin-St Jeor basal metabolic rate.
`activity_multiplier`	number		Factor applied to BMR.
`tdee_kcal_per_day`	number	kcal/day	Calories to maintain current weight.
`mild_loss_kcal_per_day`	number	kcal/day	Approximately 0.25 kg/week loss.
`loss_kcal_per_day`	number	kcal/day	Approximately 0.5 kg/week loss.
`mild_gain_kcal_per_day`	number	kcal/day	Approximately 0.25 kg/week gain.
`gain_kcal_per_day`	number	kcal/day	Approximately 0.5 kg/week gain.

Example

Male, 70 kg, 175 cm, 30 y, moderate: {"sex":"male","weight_kg":70,"height_cm":175,"age_years":30,"activity_level":"moderate"} → {"bmr_kcal_per_day":1649,"activity_multiplier":1.55,"tdee_kcal_per_day":2556,"loss_kcal_per_day":2056,"gain_kcal_per_day":3056}

GET https://tttkmbb.com/api/v1/calculate/tdee?sex=male&weight_kg=70&height_cm=175&age_years=30&activity_level=moderate

Machine access

API: GET https://tttkmbb.com/api/v1/calculate/tdee (query parameters) or POST with a JSON body {"inputs": {...}}
Schema: https://tttkmbb.com/api/v1/calculators/tdee · Markdown: https://tttkmbb.com/health/tdee.md · JSON definition: https://tttkmbb.com/health/tdee.json
MCP: server https://tttkmbb.com/mcp, tool calculate_tdee
OpenAPI operationId: calculate_tdee
Freshness: static. Authentication: none. Rate limit: fair use (see rate limits).

Sources

FAQ

How accurate is TDEE?

Typically within ±10–15%. Activity multipliers are coarse; track weight for 2–3 weeks and adjust intake by 100–200 kcal if weight moves unexpectedly.

Which activity level should I choose?

Count only deliberate exercise. Most office workers who train 3 times a week are 'light' or 'moderate', not 'very active'.

Related calculators

Macro Calculator — Turn the chosen calorie target into macronutrient grams.
Calorie Deficit & Weight Loss Time Calculator — Estimate how long a deficit takes to reach a target weight.