Calorie Intake Calculator – Your Daily Calorie Target
The Calorie Intake Calculator (Simple) gives you a personalised daily calorie target based on your age, sex, height, weight, activity level, and goal — whether that is weight loss, maintenance, or weight gain. Get your daily calorie intake recommendation, basal metabolic rate, TDEE, and a macronutrient suggestion. Simple, fast, and grounded in standard nutrition science. Formula based on the Mifflin-St Jeor BMR equation and established activity multipliers. For personalised dietary advice, consult a qualified doctor or dietitian. Free calorie intake calculator online — no sign-up needed.
Formula
This calculator transforms the provided inputs into the requested outputs using standard domain equations.
Quick Tip
Use this output as guidance and confirm clinical decisions with a qualified professional.
Not sure how many calories to eat each day? Enter your details and goal — this tool gives you a specific daily target, your BMR, your TDEE, and a rough macros breakdown. Done in 30 seconds.
Featured Answer
Q: How many calories should I eat per day?
A: Daily calorie intake depends on age, sex, height, weight, and activity level. The average moderately active adult woman needs around 1,800–2,000 calories per day; the average moderately active adult man needs 2,200–2,600. For weight loss, reduce by 300–500 calories; for weight gain, add 250–500. Use this calculator to get your personalised daily target based on your exact stats.
How to Use Calorie Intake Calculator
- Enter your age in years — BMR decreases with age, so this matters.
- Select your sex — male or female — as the formula uses different constants for each.
- Enter your height — in centimetres for metric, feet and inches for imperial.
- Enter your weight — in kilograms for metric, pounds for imperial.
- Select your activity level — from sedentary to very active.
- Select your goal — weight loss, maintenance, or weight gain.
What is Daily Calorie Intake?
Daily calorie intake is the total number of calories you consume through food and drink each day. For weight management, this number needs to align with how many calories your body burns — your Total Daily Energy Expenditure (TDEE).
- Eat at TDEE → weight maintenance
- Eat below TDEE → gradual weight loss
- Eat above TDEE → weight gain
Your TDEE starts with your BMR — the calories your body burns at rest — and is multiplied by an activity factor that accounts for how much you move. Your daily calorie intake target then adjusts that TDEE based on your goal.
For weight loss, a standard 500-calorie reduction from TDEE is recommended. For muscle gain, a 250–500 calorie surplus is the typical guideline.
The macros suggestion breaks your target calories into an approximate protein, carbohydrate, and fat distribution — a practical starting point for meal planning.
Example: 32-year-old male, 78 kg, 176 cm, moderately active, goal: weight loss.
| Field | Value |
|---|---|
| BMR | 1,840 kcal |
| TDEE | 2,852 kcal |
| Daily Calorie Intake (loss) | 2,352 kcal |
| Macros (approx) | 45% carbs / 30% protein / 25% fat |
A daily target of 2,352 creates a ~500-calorie deficit for steady fat loss.
How Many Calories Should You Eat? A Complete Guide
Why the Calorie Intake Calculator Matters
The single most common question in nutrition is: how much should I eat? And the answer is different for every person — based on their body size, age, sex, how active they are, and what they want to achieve.
Generic advice like "eat 2,000 calories" ignores all of this. A 5-foot woman in her 50s who works at a desk has completely different needs from a 6-foot man in his 30s who trains four days a week. The same target number applied to both leads to very different results.
The Calorie Intake Calculator uses the Mifflin-St Jeor equation — the most widely validated BMR formula — and adjusts for your actual activity level and specific goal. The result is a daily calorie target that fits your body, not a population average.
How to Calculate Daily Calorie Intake — Step by Step
- Calculate BMR using Mifflin-St Jeor:
- Men: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) + 5
- Women: BMR = (10 × weight kg) + (6.25 × height cm) − (5 × age) − 161
- Apply activity multiplier for TDEE:
- Sedentary: × 1.2 | Lightly active: × 1.375 | Moderate: × 1.55 | Very active: × 1.725
- Adjust for goal:
- Weight loss: TDEE − 500 kcal
- Maintenance: TDEE
- Weight gain: TDEE + 300 kcal
- Set macronutrient targets based on daily calorie goal:
- Protein: 25–30% | Carbohydrates: 40–50% | Fats: 25–30%
Real-World Example
Showing daily calorie targets for three different people with the same goal — weight loss.
| Person A | Person B | Person C | |
|---|---|---|---|
| Age / Sex | 28 / F | 40 / M | 55 / F |
| Weight / Height | 65 kg / 162 cm | 88 kg / 178 cm | 72 kg / 160 cm |
| Activity | Moderate | Lightly active | Sedentary |
| BMR | 1,431 kcal | 1,936 kcal | 1,380 kcal |
| TDEE | 2,218 kcal | 2,662 kcal | 1,656 kcal |
| Target (loss) | 1,718 kcal | 2,162 kcal | 1,356 kcal |
Person C has a much tighter calorie window for weight loss due to lower BMR and sedentary lifestyle. Her plan needs to focus heavily on nutrient density to stay healthy within that range.
Common Mistakes to Avoid
- Using a fixed 2,000-calorie target without personalising — this is too high for some people and too low for others. Always calculate your specific TDEE.
- Setting activity level too high — sedentary is more accurate than lightly active for most office workers. Overestimating TDEE means overeating.
- Ignoring macronutrient quality — hitting the calorie target with junk food produces different results than hitting it with whole foods, protein, and fibre. The number is the foundation; food quality builds on it.
- Not recalculating as weight changes — every 3–5 kg of weight loss changes the BMR meaningfully. Recalculate to avoid a stall.
- Conflating BMR and TDEE — BMR is the resting baseline; TDEE is the real-world number. Your intake target is based on TDEE, not BMR.
- Expecting linear daily progress — weight fluctuates daily. Track weekly averages for a meaningful picture of progress.
When to Use This Calculator
Use this tool at the start of any nutrition plan to establish your baseline calorie target. Also use it when changing goals — switching from weight loss to maintenance, or from maintenance to muscle gain.
For a more detailed calorie breakdown focused purely on the deficit, the Calorie Deficit Calculator walks through deficit sizing step by step. For BMR-only calculation, the BMR Calculator gives the metabolic baseline.
Pro Tips
Daily calorie intake — treat this as a weekly average target, not a rigid daily rule. Some days you eat a little more, some a little less. What matters is the weekly total.
BMR — this is your floor. Never eat below this number consistently without medical supervision. It is the minimum your body needs to keep organs functioning.
TDEE — this is your maintenance number. Understanding it gives you control: eat at TDEE to hold steady, adjust up or down to move towards your goal deliberately.
Macros suggestion — the protein target is the most important to hit first, especially during weight loss. Adequate protein preserves muscle mass and keeps hunger manageable.
Important Assumptions and Limitations
This calculator uses the Mifflin-St Jeor equation for BMR estimation and standard activity multipliers. It applies a 500-calorie deficit for weight loss and a 300-calorie surplus for weight gain. Individual metabolic rates vary. BMR calculation reviewed against the Mifflin-St Jeor equation. Macronutrient splits based on standard dietary reference intake guidelines.
For personalised advice, consult a qualified doctor or dietitian.
Frequently Asked Questions
Find answers to common questions about Calorie Intake Calculator (Simple)
Daily calorie intake is the total number of calories you consume through food and beverages in a day. For weight management, it needs to align with your Total Daily Energy Expenditure — the calories your body burns through all activity. Eating at TDEE maintains weight; eating below creates a deficit for weight loss; eating above builds towards weight gain.
Calculate your BMR using the Mifflin-St Jeor equation, multiply by your activity factor to get TDEE, then adjust for your goal — subtract 500 for weight loss, keep level for maintenance, or add 300 for gain. This calculator does the full calculation when you enter age, sex, height, weight, activity level, and goal.
The calculator uses the Mifflin-St Jeor equation, which is validated to be within 10% of measured BMR for most healthy adults. TDEE estimation adds another layer of individual variation through the activity multiplier. Use the result as a starting baseline, track your actual weight for 2–4 weeks, and adjust by 100–200 calories if results differ from expectations.
The macros suggestion shows an approximate breakdown of your daily calorie target into protein, carbohydrates, and fat — expressed as percentages and grams. It is a starting guide for meal planning. The exact macro split can be adjusted based on personal preference, dietary approach, and goals — for example, higher protein for muscle building or lower carbs for certain dietary preferences.
Recalculate every time your weight changes by 3–5 kg, when your activity level changes significantly, or when you change your goal. BMR is weight and age-dependent — as you lose weight, your calorie needs decrease. Failing to recalculate leads to a plateau where the original deficit no longer produces weight loss.
Most health guidelines set safe minimum daily intake at approximately 1,200 kcal/day for women and 1,500 kcal/day for men. Eating below these thresholds consistently risks nutrient deficiency, muscle loss, fatigue, and hormonal disruption. Any plan that drops intake near or below these minimums should only be followed under medical supervision.
Yes. Select the weight gain goal, and the calculator adds approximately 300 calories above your TDEE — a modest surplus that supports lean muscle gain when combined with resistance training. Larger surpluses (500+ calories) lead to faster weight gain but include more fat alongside muscle. A conservative 250–300 surplus is the typical recommendation for lean bulking.
Activity level is the multiplier applied to BMR to get TDEE. Moving from sedentary to moderately active increases TDEE by roughly 25–30% — which for a typical adult means 400–600 extra calories per day. This substantially changes the daily intake target for any goal. Choosing the correct activity level is one of the most impactful inputs in this calculator.