Free calorie check
Calorie Deficit Calculator
Find the daily calories that get you to your goal weight, and see how long each pace would actually take.
Your goal weight needs to be below your current weight.
What a calorie deficit actually is
Eating less than your body spends. Everything else about weight loss is detail on top of that one fact.
When food does not cover the day’s energy cost, your body makes up the difference from stored fuel. Do that consistently and the scale moves. There is no way around it and no way to fake it.
The right deficit is not the biggest one you can survive. It is the biggest one you will still be running in four months.
That is where most attempts fail. A very aggressive cut works beautifully for three weeks and then collapses, and the weight comes back with company. A modest one is dull, unglamorous, and it holds.
How big should the deficit be?
A pound of fat holds roughly 3,500 calories, so a 500 calorie daily gap works out near a pound a week. These are the paces worth considering.
Whatever pace you pick, the floor is the same: 1,200 calories a day for women and 1,500 for men. Below that you are not on a diet, you are underfed, and it belongs under medical supervision.
Making the deficit stick
The number is the easy part. These four things decide whether you are still doing it in three months.
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Put protein first
It keeps you full, costs the most energy to digest, and protects the muscle you are trying not to lose. Build each meal around it and the rest of the day gets easier on its own.
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Weigh yourself on a trend, not a day
Daily weight swings by pounds on water alone. Weigh at the same time each morning and read the weekly average. A flat week inside a falling month is nothing.
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Leave room for real life
A plan with no space for a dinner out is a plan with an expiry date. Build the deficit so an ordinary week still fits inside it.
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Lift something heavy
Resistance training is what tells your body to keep muscle while fat comes off. Without it, a chunk of what you lose is the thing that keeps your metabolism up.
Why the scale stops moving
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A lighter body costs less to run
Twenty pounds down, your maintenance has dropped by roughly a hundred calories a day. The deficit that worked in month one is a smaller deficit now, and eventually no deficit at all.
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You move less without deciding to
Dieting quietly reduces fidgeting, walking and general restlessness. It can account for a few hundred calories a day and it never feels like a choice.
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Tracking drifts
Portions creep, oil goes unlogged, weekends stop getting recorded. Research on self-reported intake finds people under-count substantially, and honest people are no exception.
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Water hides fat loss
Salt, stress, poor sleep and a new training programme all hold water. Fat can be leaving while the scale sits still for a fortnight, then drops several pounds at once.
When the deficit is right and nothing happens
Some people track carefully, hold a genuine deficit for months, and still stall well short of where they want to be. Appetite, hormones and a long history of dieting all push back, and none of that is a discipline problem.
If you have done the work and the number will not move, cutting further is usually the wrong next step. Momentum Health 360 reviews your full history, current medications and goals, and tells you plainly what your options are.
Contact Momentum Health 360Calorie deficits, answered
How many calories should I cut to lose weight?
Around 500 a day below maintenance for roughly a pound a week. That is the pace most people can hold. Larger cuts lose weight faster on paper and are abandoned far more often, and more of what comes off is muscle.
Is a 1,000 calorie deficit too much?
It is aggressive. It can suit someone starting from a higher weight, with high protein and resistance training alongside it, but it is hard to sustain and rarely necessary. It must never take you below 1,200 calories a day for women or 1,500 for men.
Why am I in a deficit but not losing weight?
Three usual reasons. Your maintenance has fallen as you have, so the deficit is smaller than it was. Intake has drifted upward without you noticing. Or water retention is masking real fat loss. Give it three weeks of weekly averages before changing anything.
Do I need to recalculate as I lose weight?
Yes. Every 10 to 15 pounds, run the numbers again. Your maintenance drops as your body gets lighter, so a target set at the start slowly stops being a deficit at all.
Should I eat back the calories I burn exercising?
Generally no. Activity is already built into the maintenance figure through your activity level, so eating back workout calories usually double-counts them. Fitness trackers also tend to overestimate burn by a wide margin.
How long will it take to reach my goal?
The calculator gives a week count for each pace. Treat it as an arithmetic projection rather than a promise: real loss is uneven, and most people are slower than the maths suggests because maintenance falls along the way.
Do GLP-1 medications change the deficit I need?
The arithmetic does not change. What changes is how hard the deficit is to hold, because appetite is lower. The risk shifts to eating far too little and losing muscle with the fat, which makes protein and resistance training more important, not less. Contact Momentum Health 360 to talk through what applies to you.
Other tools that help
The deficit sets the budget. These fill in the rest of the picture.
Medical disclaimer. This calculator and the information on this page are for general educational purposes and are not medical advice, diagnosis or treatment. Calorie needs are estimated by a formula and cannot account for muscle mass, hormones, thyroid function, medication or medical conditions, and the timelines shown are arithmetic projections rather than predictions. It does not determine eligibility for any medication or programme. Contact Momentum Health 360 about your individual health before changing how you eat, train or take medication.
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Time to goal
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These figures are estimates from a formula and cannot account for muscle mass, hormones, medication or medical conditions. Timelines are arithmetic projections, not predictions, and real loss is uneven. Contact Momentum Health 360 for personalized guidance.