This calorie deficit calculator gives you one clear number — exactly how many calories to eat each day to lose weight at the pace you choose. No extreme dieting. No guesswork. Just a safe, calculated daily target based on your body and your goal. If you have been wondering how to calculate calorie deficit properly — without cutting so low that you feel terrible — this is where you start.
What your numbers mean:
Your daily calorie target is the amount to eat each day to hit your chosen weight loss goal. Stay within 100 calories of this number most days and your weight will move in the right direction — consistently and without the crash that comes from cutting too hard.
What is a calorie deficit — and why does it work?
A calorie deficit happens when you eat fewer calories than your body burns in a day. Your body needs a certain amount of energy every day just to function — to breathe, move, digest food, and keep everything running. That number is your TDEE (Total Daily Energy Expenditure). When you eat less than your TDEE, your body has to find the missing energy somewhere — and it pulls it from stored fat. That is weight loss, at its most basic level.
One kilogram of body fat holds roughly 7,700 calories of stored energy. So to lose one kilogram, your body needs to burn 7,700 more calories than it takes in — either over a few days on a large deficit, or over a few weeks on a smaller, more sustainable one. The size of the deficit determines the speed of the loss. A larger deficit means faster weight loss — but also more hunger, less energy, and a higher chance of losing muscle alongside fat. A smaller deficit is slower but far more comfortable to maintain — and the results tend to stick. Most people do best somewhere in the middle.
How this calorie deficit calculator works
This calculator uses your TDEE — your total daily calorie burn — as the starting point, then subtracts a deficit based on how quickly you want to lose weight. The relationship between deficit size and weight loss rate comes from the widely referenced Mifflin-St Jeor research and established nutrition science on energy balance. Here is what the numbers look like in practice:
To lose 0.25 kg per week — eat 275 calories below your TDEE each day.
To lose 0.5 kg per week — eat 550 calories below your TDEE e
To lose 0.75 kg per week — eat 825 calories below your TDEE each day.
To lose 1 kg per week — eat 1,100 calories below your TDEE each day.
The calculator does this subtraction for you and shows you the daily calorie target for each goal — so you can choose what feels realistic for your lifestyle right now.
How to use this free calorie deficit calculator
Step 1 — Enter your TDEE
Your TDEE is your total daily calorie burn. If you have already used our TDEE Calculator, enter that number here directly. If you have not calculated your TDEE yet, use our TDEE Calculator first — it takes under a minute and gives you the exact number to enter here.
Step 2 — Choose your weight loss goal
Select how much weight you want to lose per week. For most people, 0.5 kg per week is the sweet spot — fast enough to see real progress, slow enough to keep energy levels up and hold onto muscle. If you are just starting out or have a lot of weight to lose, 0.5 to 0.75 kg per week is a reasonable and sustainable target.
If you are already lean and trying to lose the last few kilos, 0.25 kg per week is usually more appropriate — the less fat you have, the more carefully your body holds onto it. Avoid targeting 1 kg per week unless you have a high TDEE to begin with. On a lower TDEE, losing 1 kg per week can push your intake dangerously close to — or below — your BMR.
Step 3 — Read your results
The calculator shows your daily calorie target for each goal level so you can compare them side by side and choose the one that feels right for where you are right now. You also see your weekly calorie deficit — the total gap between what you burn and what you eat across the whole week. This helps you understand the math behind the pace of your loss.
What is a safe calorie deficit for Filipinos?
The right deficit size depends on your TDEE — and TDEE varies based on body size, age, and how active you are. For reference, here is what safe deficit ranges look like based on typical Filipino body measurements:
Average Filipino male (TDEE around 2,100 calories):
Moderate deficit — eat 1,550 to 1,800 calories/day Target — lose 0.5 kg per week
Average Filipino female (TDEE around 1,750 calories):
Moderate deficit — eat 1,200 to 1,450 calories/day Target — lose 0.5 kg per week
These are reference points only — your personal TDEE and daily target from the calculator above are the numbers to follow. One important floor to remember: women should rarely eat below 1,200 calories per day, and men below 1,500 — regardless of what the deficit math suggests. Going below these levels consistently causes muscle loss, fatigue, and metabolic slowdown that makes weight loss harder over time, not easier.
Why most calorie deficits stop working — and how to fix it
Almost everyone who has dieted for more than a few months has experienced this — weight loss stalls completely even though nothing has changed. This is not imagination. It is biology. As you lose weight, your body gets lighter and burns fewer calories to function. Your TDEE drops alongside your body weight. The deficit you calculated three months ago is no longer a deficit today — because your maintenance calories have shifted downward.
The fix is simple but easy to miss: recalculate your TDEE every four to six weeks, or any time your weight changes by three to five kilograms. Then update your daily calorie target using this calculator again. The goal is a moving target — your numbers should move with your body.
Calorie deficit and exercise — what you need to know
Exercise changes the calorie deficit equation — but not in the way most people expect. If you selected your activity level accurately when calculating your TDEE, your regular exercise is already included in that number. You do not need to eat back exercise calories on top of your daily target. Where things get tricky is when your activity changes significantly. If you start a new training program or have an unusually active week, your actual calorie burn will be higher than your TDEE estimate — and a slightly higher intake on those days is appropriate.
The practical rule: use your TDEE and daily calorie target as a weekly average rather than a rigid daily number. If you eat slightly over on some days and slightly under on others, your weekly deficit still adds up the same way.
Frequently asked questions
How do I calculate my calorie deficit?
The simplest way to calculate my calorie deficit is to subtract your daily calorie target from your TDEE.
For example: if your TDEE is 2,100 calories and you want to lose 0.5 kg per week, your daily target is 2,100 minus 550 = 1,550 calories. Your daily deficit is 550 calories. Our calculator does this automatically — enter your TDEE, choose your goal, and your target comes out instantly.
What is a good calorie deficit for weight loss?
For most people, a deficit of 400 to 600 calories per day is the most effective range for sustainable weight loss. This produces roughly 0.4 to 0.6 kg of fat loss per week — fast enough to see clear progress over weeks and months, but not so aggressive that hunger, fatigue, or muscle loss become significant problems. More than 700 to 800 calories below TDEE is where things start to go wrong for most people — especially over time.
Can I lose weight faster with a bigger deficit?
Technically yes — but practically, larger deficits tend to backfire. When you cut calories very aggressively, your body responds by reducing its own energy output. Metabolism slows, hunger hormones increase, and the combination makes the deficit harder to maintain. Most people who lose weight quickly on a very large deficit regain it within months of stopping — because the deficit was never sustainable in the first place. A moderate deficit you can maintain for three to six months will almost always produce better results than an extreme deficit you abandon after three weeks.
Should I eat the same calories every day?
You do not have to — and for most people, eating the same calories every day is ot realistic anyway. What matters is your weekly average. If your daily target is 1,600 calories, your goal is to average 1,600 across the week — not to hit it perfectly every single day. Eating slightly more on weekends or social occasions and slightly less on quieter days keeps the weekly math the same while making the diet far more liveable.
What if my calorie target feels too low?
If your calculated daily target feels uncomfortably low — trust that feeling. Check two things first: make sure your TDEE was calculated with your honest activity level (not an optimistic one), and make sure your weight loss goal is not set too aggressively for your current TDEE.
Dropping to a smaller deficit — 0.25 or 0.5 kg per week instead of 0.75 or 1 kg — will give you a higher daily calorie target that is much easier to maintain. Slower progress you can stick with beats faster progress you cannot.
How long will it take to reach my goal weight?
Divide the total weight you want to lose by your chosen weekly loss rate.
Example: if you want to lose 10 kg at 0.5 kg per week — that is 20 weeks, or roughly five months. In reality, weight loss is rarely perfectly linear. You may lose faster some weeks and slower others. Water weight fluctuations, hormonal changes, and muscle gain can all affect the number on the scale without reflecting actual fat loss. A realistic expectation is to see the trend moving in the right direction over four to six weeks — not necessarily every single day or every single week.
Related calculators
Your calorie deficit target is the foundation — these calculators help you build everything around it:
TDEE Calculator — Calculate your total daily calorie burn before using this calculator. Your TDEE is the number this tool is built on.
BMR Calculator — See the minimum calories your body needs at rest. This is the floor you should never go below on any deficit.
Ideal Weight Calculator — Find a healthy weight range for your height to give your fitness journey a clear target.
Body Fat Calculator — Estimate your current body fat using simple measurements.
Macro Calculator — Split your daily calories into the right amounts of protein, carbs, and fat for your goal.