To calculate your calorie deficit for fat loss, estimate the calories you burn each day, then eat about 300–500 fewer than that. This simple formula creates steady, sustainable fat loss of roughly half a pound to one pound per week. Here’s how to find your numbers, no guesswork.
Step 1: Estimate your maintenance calories
Your maintenance level is the number of calories that keeps your weight stable. A quick estimate is your bodyweight in pounds multiplied by 14–16 (use the lower end if you’re sedentary, the higher end if you’re very active). For example, a 160-pound moderately active person sits around 2,400 calories. For a deeper dive into how your body burns energy, see the Mayo Clinic guide to metabolism.
Step 2: Subtract for your deficit
Take your maintenance number and subtract 300–500 calories. That range is large enough to drive fat loss but small enough to stay sustainable and protect your muscle and energy. Aggressive crash deficits usually backfire, which is exactly what leads to yo-yo dieting.
Step 3: Prioritize protein and strength training
A deficit determines whether you lose weight; protein and lifting determine whether that weight is fat or muscle. Hit your protein target and keep strength training in your week so you lose fat, not muscle.
Step 4: Track, then adjust
Your estimate is a starting point, not gospel. Track your weight and measurements over two to three weeks; if fat loss stalls, trim slightly or add activity. Bodies adapt, so expect to adjust over time.
Frequently asked questions
How big should my calorie deficit be?
For most people, 300–500 calories below maintenance is the sweet spot. Effective yet sustainable, and protective of muscle and energy.
How fast will I lose weight in a deficit?
A 300–500 calorie deficit typically yields about 0.5–1 pound of fat loss per week. Slower, steady loss is easier to keep off.
Do I have to count calories forever?
No. Many people use tracking to learn portions and protein, then shift to habit-based eating once it clicks.
Get your numbers dialed in
Want help finding your exact targets? Reach out to a coach at Motivate Fitness in Boise for a plan built around you.
