Calculate your
calorie deficit
Use our free Calorie Deficit Calculator to find the exact daily calories to eat to lose weight at your chosen pace — safely, sustainably, and without extreme dieting.
- How a Calorie Deficit Works ~3 min read
- Calorie Deficit Calculator Interactive tool
- Safe Deficit Guide −250 / −500 / −750 kcal
- 5 Steps to Use the Calculator Quick-start guide
- Frequently Asked Questions 5 questions answered
The exact deficit you need
to hit your goal weight.
A calorie deficit is simply eating fewer calories than your body burns. But how big should that deficit be? Too small and you won’t lose weight. Too large and you’ll lose muscle, feel exhausted, and give up.
Our Calorie Deficit Calculator finds your personal sweet spot — based on your body, activity level, and how fast you want to reach your goal weight. Then Tou Calo tracks every meal against your target daily.
Goal-based calculation — enter your current and target weight to get a personalised daily calorie target
Progress timeline — see exactly when you’ll reach your goal weight at your chosen rate
Macro targets included — high protein recommendations to preserve muscle while losing fat
Track with Tou Calo — snap any meal and AI counts calories in 3 seconds, keeping you in your deficit effortlessly
Free Calorie Deficit Calculator
Enter your details, activity level, and goal weight — our Calorie Deficit Calculator gives you your exact daily calorie target and a full timeline to reach your goal.
How a calorie deficit leads to weight loss
Calculate your TDEE
Your Total Daily Energy Expenditure is the calories your body burns each day. This is your baseline — eating at this level maintains your current weight.
Create a deficit
Eat 300–750 calories below your TDEE each day. Your body makes up the difference by burning stored fat. A 500 kcal/day deficit equals approximately 0.5 kg of fat lost per week.
Track and adjust
Weigh yourself weekly and track every meal. If progress stalls, reduce intake by 100 kcal or increase activity. Tou Calo makes this effortless — snap food photos and the AI logs everything instantly.
Easiest to maintain. Minimal hunger. Best for people who’ve struggled with diets before.
The gold standard. Proven safe and effective for most people. Preserves muscle while losing fat.
For faster results. Requires discipline and high protein intake to prevent muscle loss. Not for long-term use.
How to use the Calorie Deficit Calculator: 5 steps
Follow these 5 steps to get the most accurate result from the Calorie Deficit Calculator above.
Enter your current weight and height
Use your morning weight for the most consistent baseline. The calculator uses this to compute your BMR via the Mifflin-St Jeor equation.
Select your activity level honestly
Most people overestimate activity. If you sit at a desk most of the day and exercise 2–3 times a week, choose “Lightly Active”. This gives you a more accurate TDEE.
Set your goal weight
Enter your target weight. The Calorie Deficit Calculator will calculate exactly how many calories you need per day and how long it will take to reach your goal.
Choose your weekly loss rate
Pick between 0.25 kg, 0.5 kg, or 0.75 kg per week. For most people, 0.5 kg/week (a 500 kcal/day deficit) offers the best balance of speed and sustainability.
Hit your target daily with Tou Calo
Once you have your calorie deficit target, use Tou Calo to stay in it. Snap a photo of any meal and AI counts the calories automatically — no guessing, no manual logging.
Calorie Deficit Calculator — Frequently Asked Questions
What is a calorie deficit?
A calorie deficit occurs when you consume fewer calories than your body burns in a day. When you eat less than your Total Daily Energy Expenditure (TDEE), your body turns to stored fat for energy — resulting in weight loss. A deficit of 500 calories per day leads to approximately 0.5 kg of fat loss per week.
How big should my calorie deficit be to lose weight?
For most people, a deficit of 300–500 calories per day is the ideal range. This produces 0.3–0.5 kg of weight loss per week — fast enough to see progress, slow enough to preserve muscle and stay energised. Deficits larger than 750 kcal/day increase the risk of muscle loss, nutrient deficiencies, and rebound weight gain.
Is it safe to be in a calorie deficit every day?
Yes — a moderate daily calorie deficit of 300–500 kcal is safe for healthy adults. You should never eat below your BMR (Basal Metabolic Rate) consistently. It’s also normal and beneficial to take occasional diet breaks (eating at TDEE for 1–2 weeks) to prevent metabolic adaptation during long-term deficits.
Why is protein important in a calorie deficit?
When you eat in a deficit, your body can break down muscle for energy if protein intake is too low. Keeping protein high (2–2.2g per kg of body weight) signals your body to preserve muscle while burning fat. High protein also keeps you fuller for longer, making the deficit easier to sustain. Track your protein intake daily with Tou Calo to make sure you’re hitting your target.
Why am I not losing weight in a calorie deficit?
The most common reason is underestimating calories — people typically undercount by 20–40% when guessing portion sizes. Using Tou Calo’s AI photo recognition eliminates this error because it measures food accurately from a photo rather than relying on your estimation. Other causes include water retention masking fat loss, inaccurate activity level estimates, or the deficit being too small to see weekly movement on the scale.
Related calculators
Tou Calo has given me a new educated control over my health. It’s the best app I’ve found to keep on top of my carbs — as a type 2 diabetic that means everything.
Know your deficit.
Actually hit it every day.
Calculating your calorie deficit is step one. Staying in it consistently is what creates results. Tou Calo tracks every meal automatically — snap a photo and AI counts the calories in 3 seconds, so nothing slips through.