500 Calorie Deficit Calculator

The arithmetic is the easy part. A pound of body fat holds roughly 3,500 calories, so a daily shortfall of 500 builds to exactly that over seven days, and a week of it points to about a pound of fat lost. The number you actually eat is your maintenance figure minus that 500 — nothing more elaborate than a subtraction. What the deficit is not is your dinner plate: 500 is the gap below maintenance, not the food itself, so on a day you burn 2,200 calories the target lands at 1,700, while a larger or more active body that burns 2,700 eats 2,200 for the very same 500 deficit. That is why a single ‘500-calorie diet’ number handed to everyone is meaningless, and why the tool above asks for your weight, height, age, sex and activity before it gives you a figure. Feed in your details and it does the maintenance estimate and the subtraction in one step, so the intake you read is built around your body rather than an average. For the full picture — including a goal date if you add a target weight — the Calorie Deficit Calculator is the parent tool this page is built from.

Five hundred has become the default for a reason that is more practical than magical: it is large enough to show up on the scale within a week or two, yet small enough that most people can hold it without their day collapsing into hunger. A pound a week feels like progress, and it does not demand that you gut your meals or skip social occasions to hit the number. That balance — visible movement against liveable restriction — is the whole appeal, and it is why so many plans reach for 500 as the opening offer rather than something steeper. None of that makes 500 a prescription or a ‘healthy’ figure for any particular person; it is a popular trade-off, not a medical recommendation, and the right gap for you depends on your size, your routine and how the first fortnight actually goes.

Your Number Depends on Your TDEE, Not Just the 500

The deficit is only half the equation; the half that changes everything is your maintenance burn. Two people can both choose a 500 deficit and end up eating hundreds of calories apart, because the 500 is subtracted from each of their own Total Daily Energy Expenditure figures, and those differ with weight, height, age, sex and how active the week really is. A taller, heavier or busier body burns more, so the same 500 deficit leaves it with a higher intake; a smaller or more sedentary body burns less and lands lower — sometimes low enough that a flat 500 would push intake under the safe floor the calculator enforces. That is exactly why guessing your maintenance is risky and why the TDEE Calculator matters: once you know your honest maintenance number, the 500 subtraction gives you a target you can trust rather than a borrowed average.

Five hundred is a starting point, not a destination. If the first couple of weeks leave you drained, hungry or watching the scale fall faster than feels comfortable, easing back to a 250-calorie deficit halves the daily gap and trades speed for a rate most people barely notice. If instead you have a larger body, a busy week and want the scale to move a little quicker, a 750-calorie deficit steps it up — though the bigger the gap, the more your protein and training matter to protect muscle. Once you have a daily calorie number you are comfortable with, the Macro Calculator splits it into protein, carbs and fat so the food you eat supports the deficit rather than working against it. These figures are general estimates for healthy adults, not medical advice.