How Many Calories Should You Eat to Lose Weight?
Every weight-loss plan eventually comes down to one number: how many calories you should eat each day. It sounds like it should have a tidy answer, and the internet is happy to hand you one — punch your details into a calculator and it spits out a confident figure to the calorie. The truth is a little messier and a lot more useful. There is no single perfect number, but there is a sensible range you can find quickly, test against reality, and adjust. This guide walks through how to estimate your maintenance calories, how to set a deficit that is safe and sustainable, and why the number matters far less than whether you actually stick to it.
What "maintenance calories" and TDEE mean
Before you can eat less, you need a rough idea of what "enough" looks like. That baseline is your maintenance calories — the amount that keeps your weight stable, neither gaining nor losing. Eat above it and you gain; eat below it and you lose. Weight loss is, at its core, spending more energy than you take in over time.
The technical name for maintenance is TDEE, or total daily energy expenditure. It is the sum of a few things: the energy your body burns just staying alive (breathing, pumping blood, keeping warm), the energy you spend digesting food, the energy of deliberate exercise, and — often the biggest swing factor — all the incidental movement of a normal day, from walking to fidgeting.
The key insight is that your deficit is measured relative to your own maintenance. Two people the same weight can have TDEEs hundreds of calories apart because one has a desk job and one is on their feet all day. That is why a target that works beautifully for a friend can leave you stalled or starving. You are aiming at your own number, not a universal one.
How to estimate your TDEE (and why it's only an estimate)
You can get a workable estimate in about a minute. Calculators use your age, sex, height, and weight to approximate your resting burn, then multiply by an activity factor. The honest part is choosing that factor without flattering yourself:
- Sedentary — desk job, little deliberate exercise, most of the day seated.
- Lightly active — light exercise or a job with some movement a few days a week.
- Moderately active — regular training or a job on your feet most days.
- Very active — hard daily training or heavy physical labor.
Most people overestimate here. A few gym sessions a week does not usually make someone "very active" if the other twenty-three hours are mostly sitting. When in doubt, pick the lower band — you can always adjust upward if the scale is dropping faster than you want.
Here is the part the calculators bury in the fine print: the output is an estimate, not a measurement. Formulas are built on population averages, and your real metabolism can sit meaningfully above or below the prediction. So treat the number as a hypothesis. The scale over the next two to three weeks is the actual experiment, and its result overrides whatever the calculator said.
Setting a safe, sustainable deficit
Once you have a maintenance estimate, the deficit is simple arithmetic: eat below it. The question is by how much. The comfortable, well-worn answer for most people is a moderate cut of roughly 300 to 500 calories a day, which tends to produce somewhere around half a kilo of loss per week.
It is tempting to go bigger — if a 500-calorie deficit loses half a kilo a week, surely a 1,000-calorie deficit doubles it? On paper, maybe. In practice, aggressive deficits tend to backfire. You feel hungrier and more tired, your training suffers, and, most importantly, the plan gets harder to follow exactly when it needs to become a habit. A deficit you abandon in three weeks loses to a smaller one you hold for three months.
| Deficit size (per day) | Approx. weekly loss | Trade-off |
|---|---|---|
| ~250 cal (small) | ~0.25 kg | Slow but very easy to sustain; barely noticeable |
| ~300–500 cal (moderate) | ~0.5 kg | The usual sweet spot — steady progress, manageable hunger |
| ~750+ cal (aggressive) | ~0.75 kg+ | Faster on paper, but harder to stick to; more fatigue and hunger |
The weekly-loss figures are approximations, not guarantees — bodies do not read spreadsheets, and week-to-week weight is noisy. Pick the row you can actually live with. For most people that is the middle one, and going lower is a perfectly good choice if life is busy or stressful. Do not chase the aggressive column just because the number looks impressive.
Why tracking adherence beats a perfect number
Here is the mindset shift that separates people who lose weight from people who keep recalculating their macros: the exact number matters much less than how consistently you hit a reasonable one.
Think about it in terms of what actually determines your result over a month. A target of 1,800 calories that you hit five days out of seven, week after week, will comfortably outperform a "perfect" 1,650 that you nail for four days and then blow past for three. Precision you cannot maintain is worthless; approximation you can repeat is everything.
This is freeing, because it takes the pressure off getting the starting number exactly right. You do not need a lab-grade TDEE. You need a sensible target and a logging habit honest enough to tell you whether you are actually hitting it. If the trend moves, the number was close enough. If it does not, you adjust — which is far easier than agonizing over the second decimal place before you begin.
How photo logging makes a deficit sustainable
The reason most calorie deficits fail is not willpower — it is friction. Manual food tracking asks you to name each food, find the right database entry, and guess a portion, several times a day. That effort is exactly where the habit dies, usually within a couple of weeks.
Photo logging removes almost all of it. Instead of describing your meal, you photograph it, and an AI estimates the food and portions for you. When you can count calories from a photo in a couple of seconds, the daily cost of staying in a deficit drops to almost nothing — and a habit that costs nothing is a habit you keep. It also quietly catches the things people forget to log: the oil the vegetables were cooked in, the real size of the portion rather than the one you imagined. Since under-logging is one of the common calorie-counting mistakes that silently erases a deficit, that honesty matters as much as the speed.
When the scale stalls
Even with everything done right, the scale will occasionally stop moving. Before you slash calories in a panic, run through the usual explanations:
- Water, not fat. Day-to-day weight swings with water retention from salty meals, hard workouts, hormones, and poor sleep. A flat or higher scale for a few days often hides real fat loss underneath. Judge the trend over two to three weeks, not the morning reading.
- Logging drift. Portions creep, "just a bite" adds up, and drinks and cooking oils go untracked. A deficit on paper can quietly become maintenance in reality. Tighten up your logging for a week and see if the number was ever real.
- Your maintenance moved. As you lose weight, a smaller body burns fewer calories, and your body may also become a little more efficient. The deficit that worked at your starting weight can shrink to nothing. This is normal — recalculate your target every few kilos, and trim a little further or add activity when progress genuinely flattens.
A true stall is a flat trend over two to three weeks, not a bad morning on the scale. Once you have confirmed it is real, the fix is small and boring: a modest further trim or a bit more daily movement, then patience.
None of this is medical advice — if you have a health condition, are pregnant, or take medication that affects weight or appetite, talk to a doctor or registered dietitian before starting a deficit.
The whole thing comes down to a loop you can actually run: estimate maintenance, subtract a moderate amount, log honestly, and let two to three weeks of trend tell you whether to hold or adjust. The number is just a starting point — consistency is what moves the scale.
Want to make the logging effortless enough to actually stick to your deficit? Try Berry Best and track your next meal from a single photo.