The 500-calorie deficit is the default of evidence-based dieting for a reason: fast enough to see weekly progress (~0.45 kg / 1 lb per week), gentle enough to fuel training, preserve muscle, and stay sane.
Setting it up
- Find your TDEE with the TDEE calculator.
- Subtract 500. That's your daily target. (TDEE 2,400 → eat 1,900.)
- Set protein at 1.8–2.2 g/kg with the protein calculator; fill the rest with carbs and fat you'll actually stick to.
Results timeline
| Period | Expected change | Notes |
|---|---|---|
| Week 1 | −1 to −2.5 kg | Mostly water/glycogen — enjoy it, don't extrapolate it |
| Weeks 2–4 | ~−0.5 kg/week | True fat-loss rate emerges; clothes fit changes |
| Months 2–3 | −4 to −6 kg total | Visible change; recalc TDEE around −5 kg |
| Month 4+ | slowing | Lighter body burns less — recalculate or take a maintenance break |
Splitting the deficit
The 500 doesn't have to be all food. A popular split: eat 300 below TDEE and add ~200 kcal of movement (a brisk 40–50 minute walk — check the walking calculator). Smaller food cuts are easier to live with, and the steps protect against the NEAT slowdown that stalls diets.
Frequently asked questions
How much weight will I lose on a 500-calorie deficit?
About 0.45 kg (1 lb) per week of fat, after the first week's larger water-weight drop. Over 12 weeks, expect roughly 5–6 kg.
Is a 500-calorie deficit safe?
For most healthy adults, yes — it's the standard recommendation in clinical weight-loss guidance. People who are pregnant, underweight, or managing medical conditions should get individual advice first.
Should the 500 calories come from food or exercise?
Either works energetically; most people sustain a mix best — e.g. 300 from food, 200 from added daily movement.
More guides
- What Is TDEE?
- What Is BMR?
- Mifflin-St Jeor Calculator
- Harris-Benedict Calculator
- Katch-McArdle Calculator
- BMR vs TDEE: What's the Difference?
- What Are MET Values?
- What Is NEAT?
- The Thermic Effect of Food
- Activity Multipliers Explained
- What Is a Calorie?
- Metabolic Adaptation Explained
- The Calorie Deficit, Explained
- 1,000-Calorie Deficit
- 300-Calorie Deficit
- How Many Calories to Lose 1 Pound a Week
- How Many Calories to Lose 2 Pounds a Week
- Reverse Dieting
- Maintenance Phase
- Calorie Cycling
- How Accurate Are TDEE Calculators?
- Not Losing Weight in a Calorie Deficit? 7 Real Reasons
- Is 1,200 Calories a Day Safe?
- Should You Eat Back Exercise Calories?
- How Long Does Metabolic Adaptation Last?
- Do You Burn Fewer Calories as You Lose Weight?
- Why Your Maintenance Calories Keep Changing
- Calorie Cycling vs Flat Deficit
- How to Avoid Muscle Loss on GLP-1 Medications