Daily Calorie Calculator
Find your exact daily calorie target for weight loss, maintenance, or muscle gain — based on your body stats and activity level.
Calculate Your Daily Calories
Maintenance (TDEE)
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cal/day
Your Goal Calories
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cal/day
Calorie Targets at All Goals
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Why Calorie Balance Is Everything
At its most fundamental level, your body weight is governed by the balance between calories consumed and calories burned. This is the First Law of Thermodynamics applied to human biology — energy cannot be created or destroyed, only converted. Every calorie surplus gets stored (primarily as body fat), and every calorie deficit gets drawn from stores (primarily body fat, but also some muscle if protein is low).
This doesn't mean all calories are equal in terms of body composition — protein and carbs each contain 4 calories per gram while fat contains 9, and each macronutrient has vastly different effects on satiety, muscle protein synthesis, and hormone production. But in terms of raw weight change, total calorie balance is the master variable.
For beginners, understanding and controlling calories is the single highest-leverage skill in nutrition. Everything else — meal timing, food quality, macros — matters, but none of it overcomes a chronic calorie surplus or deficit that doesn't match your goal.
The 3,500 Calorie Rule
One pound of body fat stores approximately 3,500 calories. A daily deficit of 500 calories creates a weekly deficit of 3,500 calories, theoretically resulting in 1 lb of fat loss per week. In practice, the rate slows as you lose weight (due to lower body mass = lower TDEE), but this rule is accurate for initial planning.
Counting Calories vs. Food Quality
You can lose weight eating only junk food if calories are controlled (IIFYM approach), but you'll feel terrible and likely lose muscle. Prioritizing whole foods, adequate protein, and vegetables naturally makes hitting your calorie target easier — they're more satiating per calorie. Use calorie targets as your framework, then fill them with nutrient-dense foods.
Best Approach for Beginners
Find Your Maintenance
Use this calculator to find your TDEE. Eat at that calorie level for 2 weeks while tracking your weight daily. If your weight is stable, the calculator is accurate. If it's changing, adjust by 100-150 calories up or down until weight stabilizes.
Set Your Deficit or Surplus
Once you know your true maintenance, apply your target adjustment. For fat loss, start with a 300-500 calorie deficit. For muscle gain, start with a 200-300 calorie surplus. Smaller adjustments preserve muscle (in a cut) or minimize fat gain (in a bulk).
Track and Adjust
Weigh yourself daily, take a weekly average, and compare week-to-week. Expect 0.5-1 lb/week of change in a cut, 0.25-0.5 lb/week in a lean bulk. If the scale isn't moving as expected after 2-3 weeks, adjust calories by 100-150 and reassess.
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Frequently Asked Questions
There's no universal answer — it depends entirely on your size, activity level, and goal. This calculator gives you a personalized estimate based on the Mifflin-St Jeor equation. As a general reference: most adult women need 1,600-2,400 calories to maintain weight, while most adult men need 2,000-3,000. Athletes and highly active individuals can need significantly more. Use your calculated TDEE as the starting point and adjust based on real results.
1,200 calories per day is the widely cited minimum for women, and most professionals consider it the absolute floor below which nutrient deficiencies and muscle loss become significant risks. For most women, this represents a very aggressive deficit and isn't sustainable long-term. Men should generally not go below 1,500 calories. If your goal calories from this calculator fall below these thresholds, consider a less aggressive deficit and a longer timeline — slow, sustainable fat loss beats rapid loss that leads to rebound.
Several possibilities: (1) You're underestimating calorie intake — research consistently shows people underreport food intake by 20-50%. Use a food scale and log everything for 2 weeks with brutal honesty. (2) Metabolic adaptation has lowered your TDEE below the calculator's estimate — try eating 100-200 calories less. (3) Water retention is masking fat loss — especially common when starting exercise, during high-stress periods, or around menstruation. (4) The calculator's TDEE estimate is too high for your individual metabolism. Track carefully and adjust based on 3+ weeks of data.
This depends on how your TDEE was calculated. If you used an activity multiplier that already accounts for your exercise (as this calculator does), then no — your exercise is already built into your TDEE. Only eat back exercise calories if you used a sedentary multiplier and then exercised on top of that. Fitness trackers like Apple Watch and Fitbit tend to overestimate calorie burn, so if you're tracking exercise separately, only eat back 50-75% of the estimated burn to be safe.
Yes, but primarily in specific circumstances: beginners to training (untrained muscle responds to even modest stimuli), people returning after a break (muscle memory), people with higher body fat levels (the body can use stored fat to fuel muscle growth), and people on performance-enhancing drugs. For advanced, lean trainees, simultaneous muscle gain and fat loss (body recomposition) is extremely slow and difficult. A small surplus (200-300 calories) is far more effective for muscle growth in most trained individuals.