Updated October 2026.
"How many calories should I eat to lose weight?" is the question every calculator exists to answer — and the one most articles answer with a single, confident, useless sentence: "eat 500 less than your TDEE." That's true the way "drive slower" is true. It's not a system. It doesn't tell you what to do when the scale stalls in week six, whether 1,200 calories is safe, or when to stop dieting entirely.
This guide is the system. Three numbers, one table, and a plateau protocol — the same math the calculators run, written out so you can do it on paper and understand every step. It connects directly to the deeper guides on this site, and it's honest about the parts of the math that are fuzzy. (And the honest disclaimer up front: this is general education, not medical advice — the guardrails at the end explain when to talk to a professional.)
The three numbers, in one minute
- BMR (basal metabolic rate) — what your body burns doing nothing at all. Your engine at idle.
- TDEE (total daily energy expenditure) — BMR plus everything: walking, workouts, digesting, fidgeting. This is your real maintenance number — eat TDEE and your weight stays put.
- Your target — TDEE minus a deficit you choose on purpose. That choice is where the entire game is played, and it's the step everyone rushes.
Every "how many calories" question is really these three numbers in sequence. Let's build them.
Step 1: Your BMR, on paper
The standard equation — Mifflin-St Jeor — is four multiplications. For a 30-year-old woman, 70 kg, 165 cm:
10 × 70 + 6.25 × 165 − 5 × 30 − 161 = 700 + 1,031 − 150 − 161 ≈ 1,420 kcal/day
For a 35-year-old man, 90 kg, 178 cm:
10 × 90 + 6.25 × 178 − 5 × 35 + 5 = 900 + 1,113 − 175 + 5 ≈ 1,843 kcal/day
That's the floor — the energy of existing. Two notes worth a full article each: there are five different BMR equations that can disagree by 100+ kcal, and why your calculator's number can be wrong is usually traceable to one honest input mistake — most often the activity level, which is exactly step 2.
Step 2: TDEE — where everyone lies (to themselves)
TDEE = BMR × an activity multiplier. The multipliers:
| Your actual week | Multiplier | Example (BMR 1,420) |
|---|---|---|
| Desk job, no training, under 5k steps/day | × 1.2 | 1,704 |
| Desk job + 1–3 workouts, or a fairly active routine | × 1.375 | 1,953 |
| 3–5 workouts a week + normal daily movement | × 1.55 | 2,201 |
| 6–7 hard workouts, or a physical job | × 1.725 | 2,450 |
| Athlete territory: training + physical job | × 1.9 | 2,698 |
Look at the gap between rows: from sedentary to "moderate" is 500 calories a day — the size of a whole deficit — earned or lost in daily movement, not workouts. This is why the single most common mistake in the entire calculation isn't the math; it's honestly believing you're a 1.55 person when you're a 1.2 person with a gym membership. A week with a phone step counter will tell you the truth. (Our woman with the desk job and two workouts — honestly a 1.375 — lands at a TDEE of about 1,950. The man at 1.55 lands near 2,860.)
One seasonal warning, since it's October: winter quietly subtracts movement. Fewer walks, less fidgeting, more driving — your multiplier can drift down a notch without a single habit feeling different. Re-check yours in December. And if you were hoping cold exposure would offset it, we ran those numbers in the cold shower BMR article — the honest answer is: a little, less than you'd like.
Step 3: choose your deficit — the goal ladder
Here is the table the one-line articles don't give you. Fat holds roughly 7,700 kcal per kilogram (~3,500 per pound), so a deficit converts to a predictable pace. Our example woman: TDEE 1,950.
| Goal | Deficit | She would eat | Expected pace | Best for |
|---|---|---|---|---|
| Gentle | ~10% (−200) | ~1,750 | ~0.2 kg/week | Last 3–5 kg, hate dieting, want zero hunger |
| Standard | ~20% (−400) | ~1,550 | ~0.4 kg/week | The sweet spot for most people |
| Classic | −500 | ~1,450 | ~0.45 kg/week | Same as standard; the round number |
| Aggressive | ~25%+ (−500–750) | 1,200–1,450 | 0.5–0.7 kg/week | Higher body weights, a deadline, short spells only |
Notice where the ladder stops. Our example woman could ask for 1 kg a week — that's a 1,100-calorie deficit, eating ~850 kcal/day — and the ladder says no: it crashes below her BMR (1,420), below every reasonable floor, and into the territory where muscle loss, gnawing hunger and rebound live. The cap isn't a rule from a forum; it's arithmetic:
Maximum pace ≈ 1% of body weight per week. For 70 kg, that's 0.7 kg — about a 770 kcal deficit — and realistically 0.5–0.6.
If that sounds slower than the transformation ads promised — good. That suspicion is the article working.
The guardrails (read these even if you skip the math)
- Never build a permanent life far below your BMR. Short stretches slightly under are survivable and common — here's exactly what happens when you do it — but a chronic 1,200-calorie life for someone with a 1,400 BMR is a starvation protocol with better branding.
- "1,200 for women, 1,500 for men" is a rough guardrail, not a law. It's a sensible tripwire for average bodies. If you're 165 cm it means something different than if you're 180. Your own BMR and TDEE are better guides than any universal number.
- Protein is the muscle insurance: 1.6–2.2 g per kg of body weight (our example woman: 110–150 g) plus resistance training twice a week. Muscle is what keeps your metabolic floor high — the real math is in does muscle burn 50 calories a day? (spoiler: less than the memes say, more than nothing, and worth keeping).
- Medical line: pregnancy, diabetes, a history of eating disorders, BMI under 18.5, or any chronic condition — this table is not for you; it's a conversation with your doctor or a registered dietitian. And if you find yourself hiding your eating or terrified of normal meals, that's not a discipline problem. That's a "seek help now" problem, and the fastest kind.
The plateau protocol — what to do in week six
Everyone stalls. Almost nobody is told what to do about it, so here is the protocol, in order:
- First, check the calendar math. The first two weeks of any deficit drop water and glycogen — a flattering whoosh that sets a false pace. Weeks three onward are the real rate. A "stall" that's really week three of normal pace is not a stall.
- Weigh the average, not the day. Daily weight moves 1–2 kg on sodium, carbs, cycle phase and salt. One number per week, same conditions, seven-day average. If that average is flat for three weeks, continue.
- Recalculate. You weigh less now — your BMR and TDEE have genuinely shrunk with you, and adaptation nibbles a further 5–15% off (the honest, unsensational version of "starvation mode" — we covered the actual science here). Every 4–6 kg lost, redo steps 1–3 with your new weight. The 1,550 that worked at 70 kg is a maintenance number at 62.
- Add movement before cutting food. 2,000 extra steps is ~80–100 kcal, every day, without touching your meals or your hunger. Do that for two weeks before touching the deficit again.
- Consider a diet break. Every 8–12 weeks, one to two weeks at estimated maintenance. It doesn't "reset your metabolism" — it resets you: hunger, adherence, gym performance, sanity. Long diets are lost in the mind before the metabolism.
When to stop — the part no article covers
Dieting is a project with an end date, not a personality. Stop (and move to maintenance, which is just eating at TDEE) when any of these is true: you've held the goal weight for a month of normal eating; you're within the healthy BMI range and the mirror agrees; the deficit has stopped working twice after recalculation; or life — sleep, mood, training, libido — has visibly declined. Maintaining a result is a different skill than reaching it: same foods, more of them, and a weekly weigh-in as the feedback loop instead of daily counting. Many people also use a gentle reverse diet — adding ~100 kcal per week up to true maintenance — to unfurl hunger hormones and social life without rebound. And if you're wondering why maintenance seems unfairly low for you, that's the next rabbit hole: why your BMR is what it is — age, muscle, and the real fixes.
What about fat burners and supplements?
Ranked honestly: caffeine and protein do real (modest) work; everything else in the "fat burner" aisle is mostly expensive urine — and the metabolism-hype products currently flooding feeds are scored, ingredient by ingredient, in our sister site's weight-loss supplement comparison. The deficit does the losing. Supplements, at best, make the deficit marginally easier.
Frequently asked questions
How many calories should I eat to lose 1 kg (2.2 lb) a week?
About a 1,100 kcal daily deficit — which for most people is too aggressive: it lands below BMR, strips muscle, and rebounds. A kilogram a week suits higher body weights under medical supervision; for most people 0.5–1% of body weight per week (roughly 0.4–0.7 kg) is the ceiling that holds muscle and sanity.
Should I subtract my deficit from BMR or TDEE?
Always TDEE. BMR is your idle, not your maintenance — subtracting from BMR double-counts nothing and starves everything. Full breakdown in BMR vs. TDEE: reading a calorie estimate responsibly.
Is eating 1,200 calories a day safe?
For some bodies, briefly, yes — it's a guardrail from research on very-low-calorie protocols, not a magic number. The better test is your own math: chronic intake far below your BMR, relentless hunger, or stalled gym performance all say the number is too low for you regardless of what any universal rule says.
Why did my weight loss stall after a month?
Usually three things stacked: your TDEE shrank with your new weight, adaptive thermogenesis trimmed a further 5–15%, and water is masking real fat loss. The fix is the five-step plateau protocol above — recalculate with your current weight, weigh weekly averages, add steps, and consider a diet break.
Do I have to count calories forever?
No. Counting is training wheels: 8–12 weeks teaches you portion sizes in your hands. After that, most people maintain on hand-portion meals plus a weekly weigh-in — the scale becomes the calorie counter, and you only recount if the trend line drifts.
Will my metabolism be damaged by dieting?
It adapts — TDEE drops with weight and by a further 5–15% during long deficits — but "damage" is the wrong word: most of it recovers with weight regain and maintenance eating. The real risks of repeated aggressive dieting are muscle loss and the lose-regain cycle. Moderate deficits, protein and lifting are the insurance policy.
The final word
The entire answer to "how many calories should I eat?" is four moves: know your BMR, multiply honestly, pick your rung on the ladder, and manage the plateau like a project. The math is the easy part — a pencil and ten minutes. The hard part is choosing the pace you can actually live with, and stopping when you're done. Do that, and you're ahead of everyone still looking for the number that requires none of this.
Go deeper on this site: all 5 BMR equations explained · BMR vs. TDEE · eating below your BMR · why your BMR is low · does starvation mode exist? · muscle and BMR, the real math
Our network: trustscore.bond — honest, scored reviews of weight-loss and health products · daysuntil.bond — live countdowns to every event worth waiting for.
This article is general education, not medical advice. Calorie and BMR estimates are statistical predictions — individual needs vary. If you are pregnant, managing a medical condition, under 18, or have any history of disordered eating, work with a doctor or registered dietitian rather than a formula.
Comments
Post a Comment