Balancing body weight requires knowing how much energy your body spends each day before setting an intake target. Entering your physical metrics and routine gives you an exact daily calorie intake targeted to lose fat, maintain weight, or build lean mass. Re-running these numbers as your body changes keeps your nutrition strategy on track.
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To establish your daily calorie target, multiply your Basal Metabolic Rate by an activity factor ranging from 1.2 to 1.9 to find your Total Daily Energy Expenditure. Subtract 500 calories for fat loss, add 300 calories for muscle growth, or match it exactly to maintain your current body weight.
This calculator determines your total daily energy expenditure (TDEE) and applies a goal-specific adjustment. It uses the Mifflin-St Jeor equation, which clinical reviews show provides the most consistent estimate of resting metabolic rate across diverse populations.
BMR represents the calories your body consumes at complete rest over 24 hours to maintain vital organ function.
Your BMR is multiplied by an activity factor corresponding to your daily movement:
Finally, the tool adjusts your TDEE based on your selection:
Calculators based on the Mifflin-St Jeor formula provide population-level estimates with a standard error margin of roughly 10%. They do not measure thyroid status, sex hormone concentrations, metabolic adaptation from prolonged dieting, or precise body composition. Highly muscular athletes may find this formula underestimates their actual maintenance intake, whereas individuals with high body fat percentages may receive an overestimation because fat mass consumes less energy than muscle mass. Use this tool as a starting baseline, but adjust your daily intake by 100 to 150 calories if your 3-week average weight trend does not match your target outcome. Seek guidance from a registered dietitian or medical doctor if you experience unexplained weight shifts or symptoms of low energy availability.
Pick a band to see what it means and what to do. Yours is selected once you calculate.
Matches your total daily expenditure to keep your current weight stable over time.
Maintain this intake level while tracking body weight twice weekly to establish your true energy equilibrium.
Real situations. Tap one to run it through the calculator above.
A 34-year-old female weighing 68 kg at 165 cm tall works an office job and walks twice a week. She wants to drop body fat without crashing her energy.
Calculator result: Target: 1,398 kcal/day
This target provides a sustainable deficit that protects energy levels while encouraging steady fat loss. Use the macro-calculator to distribute these calories into adequate protein, fat, and carbohydrates.
A 28-year-old male weighing 82 kg at 180 cm tall trains intensely 5 days per week and wants to build shoulder and leg size.
Calculator result: Target: 3,422 kcal/day
The calculated surplus provides the additional energy required for recovery and muscle growth without excess fat gain. Check your progress using the protein-intake-calculator to pair your calories with the right protein intake.
A 52-year-old female weighing 58 kg at 162 cm tall exercises regularly with jogging and yoga 4 days per week and wants to hold her weight steady.
Calculator result: Target: 1,816 kcal/day
This maintenance target balances her exercise output with daily energy intake to avoid unintended weight loss. Monitor your weight average every 2 weeks to ensure scale stability.
Tick them off as you go.
If your weekly average weight remains unchanged over 14 consecutive days, your true expenditure is lower than estimated. Reduce your target by 150 calories per day or increase your daily movement by 2,000 steps, then monitor the trend for another two weeks.
Recalculate your target whenever you lose or gain 3 to 5 kg of body mass, or whenever your employment or workout routine permanently shifts. Small changes in body weight alter your BMR and shift your total daily energy output.
No, because the activity multiplier you chose already builds your typical exercise routine into the total expenditure figure. Adding extra calorie allowances for individual workouts usually results in overeating and halts weight loss.
Different calculators use alternative equations, such as Harris-Benedict or Katch-McArdle, which apply different weight variables or require body fat estimates. Fitulse uses Mifflin-St Jeor because clinical studies show it accurately reflects daily expenditure for the vast majority of adults.
A deficit larger than 500 calories can speed up initial scale loss, but it significantly increases the proportion of weight lost from muscle tissue and often causes intense fatigue. Capping your deficit at 500 calories preserves metabolic rate and athletic performance.
No, the total daily calorie requirement remains identical regardless of whether you consume your food within a 4-hour, 8-hour, or 12-hour window. Meal timing alters hunger signaling and convenience, but total energy balance dictates weight change.
Aim to consume 1.6 to 2.2 grams of protein per kilogram of total body weight daily, assign 20% to 35% of your calories to dietary fats, and fill the remaining balance with carbohydrates to maintain gym performance.
General wellness information, not medical advice. If you have a health condition or are worried about a result, talk to a doctor.