Health & Fitness · Guide
Daily Calorie Calculator Guide: Maintenance, Cut and Bulk
Every weight goal runs through one number: how many calories your body uses in a day. That number is your Total Daily Energy Expenditure (TDEE), built from your resting burn plus the energy you spend moving, training and digesting food. A calorie calculator estimates your TDEE so you can choose a target that genuinely moves the scale in the direction you want.
In this guide
From BMR to TDEE
Start with your BMR — the calories burned at rest — then multiply by an activity factor. Sedentary work adds little, while intense daily training can nearly double your resting burn. Picking the activity level closest to your real week avoids overestimating your needs.
Calories for weight loss
A pound of body fat holds roughly 3,500 calories, so a deficit of about 500 calories a day leads to about a pound of loss per week. Deficits of 10–20% below maintenance are effective and sustainable; much larger cuts risk muscle loss and rebound hunger.
Calories for muscle gain
To gain muscle, eat a modest surplus of about 250–500 calories above maintenance alongside strength training. A smaller surplus limits fat gain while still fueling growth, which is why a slow bulk beats an aggressive one for most people.
Key takeaways
- TDEE = BMR × activity factor.
- A ~500 calorie daily deficit loses about a pound a week.
- Modest deficits and surpluses are the most sustainable.
- Reassess after a few weeks based on real weight change.
Frequently asked questions
How do I know my maintenance calories?
Use the Daily Calorie Calculator with an honest activity level, then track your weight for 2–3 weeks and adjust up or down based on the trend.
Is 1,200 calories a day too low?
For most adults, yes — it is far below maintenance and risks muscle loss and nutrient gaps. Aim for a sustainable 10–20% deficit instead of extreme cuts.
Do calories matter more than macros?
For weight change, total calories decide the direction; protein and the balance of other macros decide body composition and how you feel while losing or gaining.
Put these numbers to work
BMI, BMR, daily calories, ideal weight and body fat — instantly.
Daily Calorie Calculator
Calculate the calories you need to maintain, lose or gain weight.
BMR Calculator
Calculate your Basal Metabolic Rate with the Mifflin-St Jeor equation.
BMI Calculator
Calculate your Body Mass Index and healthy weight range.
Body Fat Calculator
Estimate body fat percentage with the U.S. Navy method.