How Many Calories Do You Need to Lose Weight?

"Eat fewer calories than you burn" is true and also not very useful on its own — it doesn't tell you how many fewer, or how to find your baseline in the first place. Here's the actual sequence to get from "I want to lose weight" to a specific daily number.

Step 1: Find your maintenance calories (TDEE)

Before you can subtract anything, you need to know what "maintenance" looks like for you. Total Daily Energy Expenditure (TDEE) is your real-world maintenance number — BMR (resting burn) multiplied by an activity factor. Use the TDEE Calculator to get this number, being honest rather than aspirational about your actual activity level — this is the single most common place people get the next step wrong.

Step 2: Apply a moderate deficit

A widely used, sustainable starting point is roughly 500 calories below TDEE, historically linked to about 0.5kg of fat loss per week via the rough "3,500 calories per pound of fat" approximation. It's not perfectly precise — individual results vary — but it's a reasonable, well-tested starting point rather than a guess.

Target calories = TDEE − 500

Step 3: Adjust based on what actually happens

Track your weight for two to three weeks (using a weekly average, not daily readings, which are noisy) and compare against the expected rate of loss. Losing faster than expected might mean increasing intake slightly to make the deficit more sustainable; losing slower or not at all usually means activity level was overestimated, or intake is running higher than tracked. The Calories Calculator does steps 1 and 2 in one pass if you'd rather skip the manual subtraction.

Why bigger deficits usually backfire

Larger deficits accelerate short-term loss but increase hunger, reduce training performance, and raise the risk of losing muscle alongside fat — and critically, they're harder to sustain. A deficit abandoned after ten days isn't actually faster than a moderate one sustained for three months; it just front-loads the frustration.

Protein is the detail most people skip

Higher protein intake during a deficit helps preserve muscle mass and improves satiety — it's the macronutrient most worth getting right even if everything else stays loose. A deficit with adequate protein feels meaningfully different than the same deficit without it.