Calorie Calculator
Find out exactly how many calories you need per day — based on your body, activity, and goal. Uses the Mifflin-St Jeor equation.
Enter your details
Fill in your details to see your personalized calorie target.
Your daily target
BMR (at rest)
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TDEE (maintenance)
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Weekly deficit/surplus
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Projected change
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How this calculator works
A quick walkthrough of the math behind your number.
BMR
Your Basal Metabolic Rate — calories burned at complete rest — using the Mifflin-St Jeor equation.
TDEE
BMR multiplied by your activity level to estimate your real-world daily calorie burn.
Target
TDEE adjusted up or down based on your goal (loss, maintain, or gain).
Estimates, not prescriptions. These numbers give you a solid starting point. Real metabolism varies by ±10–15% between people. Track for 2–3 weeks and adjust if your weight trend doesn't match your goal.
Knowing the number is easy. Hitting it is hard.
SlayCal scans every meal, logs the calories automatically, and shows you exactly how much room is left in your daily target — in real time.
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