Free Simple Calorie Intake Calculator

Daily Calorie Needs and Your TDEE

The Simple Calorie Intake Calculator helps you estimate how many calories you need each day to maintain your current weight, based on your basal metabolic rate (BMR) and your typical physical activity level. This TDEE calculator uses the Mifflin‑St Jeor equation, which is widely regarded as one of the most accurate formulas for calculating BMR. Daily Calorie Needs are expressed in kilocalories (kcal) — the same unit commonly referred to as “calories” in nutrition.

BMR Formulas (Mifflin‑St Jeor)

For women:

$$\text{BMR} = 10 \times \text{weight (kg)} + 6.25 \times \text{height (cm)} - 5 \times \text{age (years)} - 161$$

For men:

$$\text{BMR} = 10 \times \text{weight (kg)} + 6.25 \times \text{height (cm)} - 5 \times \text{age (years)} + 5$$

BMR represents the energy your body requires at complete rest to maintain vital functions like breathing and circulation. It is the baseline from which your total daily energy expenditure (TDEE) is derived.

Physical Activity Level (PAL) and TDEE

To find your maintenance calories, multiply your BMR by the Physical Activity Level (PAL) that best matches your lifestyle:

Activity Level	Description	PAL Value
Sedentary	Little or no exercise	1.2
Light	1–2 sessions per week	1.4
Moderate	2–3 sessions per week	1.6
Hard	3–5 sessions per week	1.75
Very Hard	6–7 sessions per week or physical job	2.0

TDEE (kcal/day) = BMR × PAL

For example, a 50‑year‑old woman who is 165 cm tall, weighs 65 kg, and engages in light exercise (PAL = 1.4) would have:

$$\begin{aligned} \text{BMR} &= 10 \times 65 + 6.25 \times 165 - 5 \times 50 - 161 = 1269.25 \text{ kcal/day} \\ \text{TDEE} &= 1269.25 \times 1.4 \approx 1777 \text{ kcal/day} \end{aligned}$$

This means her estimated maintenance calories are roughly 1777 kcal per day.

Adjusting for Specific Situations

If you are pregnant, breastfeeding, or a professional athlete, your energy needs may differ from the standard estimate. People with certain health conditions should also seek personalized advice. This tool provides a starting point, not a medical prescription.

Nutrition for Muscle Gain and Weight Loss

When the goal is gaining muscle, controlling total caloric intake is only part of the strategy. A balanced split of carbohydrates, protein, and fat – often called macronutrients – is equally important. Using a macro calculator alongside this daily calorie needs tool can help you tailor your diet more precisely.

For weight loss, you need a calorie deficit — consuming fewer calories than your TDEE. However, it is crucial never to drop below your BMR, as doing so can interfere with basic metabolic functions and lead to nutrient deficiencies. A safe deficit typically ranges from 300–500 kcal below your TDEE.

Important Disclaimer

This Calorie Intake Calculator is intended for educational and informational purposes only. It does not replace a professional medical evaluation. Always consult a doctor or a registered dietitian before making significant changes to your diet, especially if you have underlying health conditions or are following a very low‑calorie regimen.