How Many Calories Should You Eat to Lose Weight?
The math behind weight loss is straightforward: eat fewer calories than you burn. The challenge is knowing exactly what "fewer" means for your specific body. Too aggressive and you lose muscle. Too conservative and you barely move the needle.
This calculator uses the Mifflin-St Jeor formula to find your BMR, multiplies by your activity level to get your maintenance calories, then subtracts a deficit based on your chosen pace. One pound of fat equals roughly 3,500 calories, so a 500-calorie daily deficit equals about one pound of loss per week.
Choosing the Right Pace
Faster weight loss sounds better, but the research consistently shows that moderate paces produce better long-term results. Here is what each pace actually looks like:
0.5 lb/week — 250-calorie deficit. Minimal hunger, easy to stick to, very low muscle loss risk. Good if you only have 10 to 15 pounds to lose.
1 lb/week — 500-calorie deficit. The standard recommendation. Noticeable progress without extreme deprivation.
1.5 to 2 lbs/week — 750 to 1,000-calorie deficit. Works best for people with more weight to lose or those who can tolerate stricter tracking.
Whatever pace you choose, prioritize protein intake to preserve muscle during the process.
Why Tracking Works
People who track their calories lose more weight on average than those who do not. The act of tracking makes you aware of what you are actually eating versus what you think you are eating. Studies show that most people underestimate their intake by 30 to 50 percent.
You do not need to track forever. A few weeks of honest tracking gives you a solid sense of portion sizes and calorie density. After that, many people can maintain results with occasional check-ins.
Adjusting as You Go
Your calorie needs change as you lose weight. Every 10 to 15 pounds, recalculate your target. The deficit that worked at 200 pounds may not produce the same results at 180 pounds.
If your weight has not budged in 2 to 3 weeks of consistent tracking, your deficit has probably shrunk. Drop your calories by 100 to 200 or increase your activity slightly.
Frequently Asked Questions
For most women, no lower than 1,200. For most men, no lower than 1,500. Going below these numbers makes it very hard to get enough nutrients.
You can lose weight with diet alone, but exercise helps preserve muscle and improves health markers. The best approach is diet for calorie control plus exercise for overall fitness.
Technically yes for weight loss, but food quality matters for energy, satiety, and long-term health. Prioritizing protein and vegetables makes sticking to your target much easier.
Disclaimer: This calculator is for informational purposes only and does not constitute medical advice.
