How many calories should I eat to lose weight?

Subtract a daily deficit from your TDEE—not from BMR. A 500–550 kcal/day deficit typically supports ~0.5 kg (1 lb) of fat loss per week. Use this calculator to personalize your target based on your stats, activity, goal weight, and timeline. Track intake for 2–3 weeks and adjust ±100–200 kcal if progress stalls.

What formula does this calorie deficit calculator use?

We estimate TDEE using the Mifflin-St Jeor BMR formula multiplied by your activity level (×1.2 to ×1.9), then subtract a daily deficit based on your weekly loss rate: Daily Target = TDEE − (weekly kg loss × 7,700 ÷ 7). The 7,700 kcal/kg figure approximates energy in body fat. Your target is capped at BMR when a rate would require eating below resting needs.

Why is there a safety warning above 1,000 kcal/day deficit?

Deficits larger than ~1,000 kcal/day are difficult to sustain and may increase muscle loss, nutrient deficiencies, fatigue, hormonal disruption, and metabolic adaptation. Most health professionals recommend moderate deficits of 250–750 kcal/day for sustainable fat loss. If you see this warning, consider a slower weekly rate or a longer timeline.

Should I eat below my BMR to lose weight faster?

No. BMR is your resting burn—not a daily eating target. Eating at or below BMR long-term can reduce muscle mass, lower metabolic rate, and increase nutrient deficiency risk. Base deficits on TDEE. This calculator caps your target at BMR when a selected rate would require eating below resting needs.

What is the difference between TDEE and a calorie deficit target?

TDEE is your maintenance calories—the amount that keeps your current weight stable. Your deficit target is TDEE minus the calories needed to achieve your chosen weekly loss rate. For example, TDEE 2,500 kcal with a 500 kcal deficit → eat 2,000 kcal/day for ~0.5 kg/week loss.

How do I choose a weekly loss rate?

0.25 kg/week (~275 kcal/day deficit) is gentle and easier to maintain. 0.5 kg/week (~550 kcal/day) is the most common starting point. 0.75 kg/week (~825 kcal/day) is moderate-aggressive. 1 kg/week (~1,100 kcal/day) triggers a safety warning and is not suitable for everyone. Slower rates generally preserve more lean muscle.

Can I use a target date instead of a weekly rate?

Yes. Enter your goal date and the calculator derives the required weekly loss rate and daily calorie target. If the implied rate is too aggressive (>1.5 kg/week), choose a later date or adjust your goal weight. Target-date mode is useful for events but should still respect safe deficit limits.

How accurate is this calorie deficit calculator?

Formula-based TDEE is a strong starting estimate but individual metabolism, NEAT, training intensity, sleep, stress, and body composition can shift actual needs by 10–20%. Track intake and weekly average weight for 2–3 weeks, then adjust calories until progress matches your goal. Recalculate every 4–6 weeks during active weight loss.

Do I need to recalculate as I lose weight?

Yes. A lighter body burns fewer calories at rest and during activity. Recalculate every 4–6 weeks during active weight loss, or whenever progress stalls for 2+ weeks despite consistent adherence. The same calorie target that worked at 85 kg may be maintenance—not a deficit—at 78 kg.

Will my deficit stay the same throughout my diet?

Your required deficit in kcal/day for a fixed weekly rate stays similar, but your TDEE drops as you lose weight—so you may need to lower calories over time to maintain the same rate of loss. Alternatively, increase daily movement (steps, NEAT) to offset the metabolic drop.

Is this calculator suitable for everyone?

This tool is designed for generally healthy adults (15+). Pregnancy, breastfeeding, eating disorders, diabetes, kidney disease, adolescents, and other medical conditions require individualized medical nutrition guidance—not formula-based deficit targets. Consult a registered dietitian or physician before aggressive calorie restriction.

Calorie Deficit & Weight Loss Calculator

Q: What is a calorie deficit?

A calorie deficit means you consume fewer calories than your body burns (TDEE). Over time, this forces your body to use stored energy—primarily body fat—for fuel, leading to weight loss. A deficit of roughly 7,700 kcal cumulative over time corresponds to about 1 kg (2.2 lb) of body fat, though water and glycogen also affect scale weight.

Calculate your daily calorie target for weight loss from your body stats, activity level, goal weight, and timeline. See your TDEE, required daily deficit, estimated weeks to goal, and safety warnings—with PDF export.

Enter your details — results appear below after you calculate.

User information

Units

Sex

Body stats

Age (years)

Current weight (kg)

Height (cm)

Activity level

Weight loss goal

Goal weight (kg)

Timeline

Weekly loss rate

How this Calorie Deficit & Weight Loss calculator works

Enter your sex, age, weight, height, and activity level. Add your goal weight and either a weekly loss rate (0.25–1 kg/week) or a target date. We estimate your TDEE, then calculate your daily calorie target, required deficit, and estimated weeks to goal.

Formula: Daily Target = TDEE − (weekly kg loss × 7,700 ÷ 7). A safety warning appears if the deficit exceeds 1,000 kcal/day. Your target is capped at BMR when a rate would require eating below resting needs.

Built for real-world fat-loss planning—including everyday meal patterns, women over 40, and sedentary desk jobs—with safe deficit caps rather than aggressive crash-diet targets.

Pair with our TDEE Calculator, BMR Calculator, and Macronutrient Calculator for complete weight-loss nutrition planning.

Calorie Deficit & Weight Loss Calculator – Daily Target, TDEE & Timeline

A calorie deficit means eating fewer calories than your body burns (TDEE). Over time, that gap forces your body to use stored energy—primarily body fat—for fuel, leading to weight loss. Our free calorie deficit calculator estimates your daily calorie target, current TDEE, required daily deficit, and estimated weeks to goal from your age, sex, height, weight, activity level, goal weight, and timeline (weekly loss rate or target date). Results include safety warnings when the deficit exceeds 1,000 kcal/day, interpretation, recommendations, and PDF export.

What Is a Calorie Deficit?

Your Total Daily Energy Expenditure (TDEE) is the number of calories you burn in a typical day—including resting metabolism (BMR), digestion, daily movement (NEAT), and exercise. When you eat below TDEE, you create a calorie deficit. Roughly 7,700 kcal of cumulative deficit corresponds to about 1 kg (2.2 lb) of body fat, though water, glycogen, and lean tissue also shift scale weight day to day.

Sustainable fat loss usually targets a moderate deficit of 250–750 kcal/day (about 0.25–0.75 kg or 0.5–1.5 lb per week). Larger deficits are harder to maintain and may increase muscle loss, fatigue, hormonal disruption, and rebound risk—especially without adequate protein, sleep, and resistance training.

1What You Enter

Required inputs

Unit system: metric (kg, cm) or imperial (lb, ft/in)
Sex (male or female)
Age (years)
Current body weight
Height
Activity level (Sedentary, Lightly Active, Moderately Active, Very Active, Athlete)
Goal weight (must be below current weight)
Timeline: weekly loss rate (0.25–1 kg/week) or target date

Tips for accuracy

Use recent morning weight on a consistent scale
Pick activity based on a typical week—not your hardest day
Set a realistic goal weight; very low targets may trigger aggressive deficits
For target-date mode, allow enough time (we flag timelines implying >1.5 kg/week)
Recalculate every 4–6 weeks during active weight loss as TDEE drops

2Formulas We Use

Basal metabolic rate (BMR)

Men: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age + 5

Women: BMR = 10 × weight(kg) + 6.25 × height(cm) − 5 × age − 161

Example: 80 kg, 175 cm, age 30, male → BMR ≈ 1,755 kcal/day at rest.

Total daily energy expenditure (TDEE)

TDEE = BMR × activity multiplier (1.2 to 1.9)

Example: BMR 1,755 × 1.55 (moderately active) → TDEE ≈ 2,720 kcal/day maintenance.

Daily calorie target for weight loss

Daily Target = TDEE − (weekly kg loss × 7,700 ÷ 7)

Example: 0.5 kg/week → 0.5 × 7,700 ÷ 7 = 550 kcal/day deficit → eat TDEE − 550 kcal. For TDEE 2,720, target ≈ 2,170 kcal/day.

Timeline & safety rules

Estimated weeks = weight to lose (kg) ÷ weekly loss rate
Target date mode — weekly rate = weight to lose ÷ weeks until date
Safety warning when calculated deficit > 1,000 kcal/day
Target capped at BMR when rate would require eating below resting needs

3What Your Results Include

Daily calorie target — how many calories to eat per day to reach your goal weight
Current TDEE — maintenance calories before the deficit
Daily deficit required — TDEE minus your target
Estimated weeks to goal — projected timeline based on your rate or target date
Weight to lose — gap between current and goal weight
Safety warning — shown when deficit > 1,000 kcal/day
Your inputs summary (sex, age, weight, height, activity)
Plain-language interpretation of your numbers
Personalized recommendations for tracking and recalculation
Cross-links to TDEE, BMR, and Macronutrient calculators
PDF export and share

Activity Multipliers Reference

Level	Multiplier	Typical pattern
Sedentary	×1.2	Desk job, little or no exercise
Lightly Active	×1.375	Light exercise 1–3 days/week
Moderately Active	×1.55	Moderate exercise 3–5 days/week
Very Active	×1.725	Heavy exercise 6–7 days/week
Athlete	×1.9	Athletic training or physical job, 2×/day

BMR vs TDEE vs Calorie Deficit Target

Metric	Meaning	Use for
BMR	Calories burned at complete rest	Baseline metabolism—not a daily eating target for weight loss
TDEE	BMR + all daily activity and exercise	Maintenance calories—the starting point for any deficit
Deficit target	TDEE minus calories needed for your weekly loss rate	Your daily eating goal to reach goal weight on your timeline

Calorie Deficit Calculator vs TDEE vs Calorie Calculator

Tool	Best for	Output focus
Calorie Deficit Calculator (this page)	Goal weight + timeline planning with daily target and weeks to goal	Deficit target, TDEE, safety warnings, estimated timeline
TDEE Calculator	Maintenance calories, BMR/TDEE split, ±500 kcal goal presets	TDEE-first with macro split suggestions
Calorie Calculator	Broader calorie planning with charts and extended educational content	TDEE, BMR, and multiple loss/gain presets

Weekly Loss Rate Guide

Weekly loss	Daily deficit	Notes
0.25 kg/week (~0.5 lb)	~275 kcal	Gentle, easier to sustain long-term
0.5 kg/week (~1 lb)	~550 kcal	Common starting recommendation
0.75 kg/week (~1.5 lb)	~825 kcal	Moderate-aggressive; monitor adherence
1 kg/week (~2 lb)	~1,100 kcal	Aggressive — triggers safety warning; not for everyone

Sample Calorie Deficit Calculations

Example A (moderate loss)

80 kg → 70 kg goal, 175 cm, age 32, male, moderately active → BMR ≈ 1,755 kcal → TDEE ≈ 2,720 kcal. At 0.5 kg/week (−550 kcal/day) → target ≈ 2,170 kcal/day. ~20 weeks to goal.

Example B (gentle loss)

68 kg → 63 kg goal, 165 cm, age 40, female, lightly active → BMR ≈ 1,344 kcal → TDEE ≈ 1,848 kcal. At 0.25 kg/week (−275 kcal/day) → target ≈ 1,573 kcal/day. ~20 weeks to goal.

Example C (target date)

90 kg → 82 kg goal in 16 weeks, 180 cm, age 28, male, very active → TDEE ≈ 3,157 kcal. Required rate 0.5 kg/week → target ≈ 2,607 kcal/day. Deficit ≈ 550 kcal/day.

Benefits of Using This Calorie Deficit Calculator

Personalized daily target — Not a generic “eat 1,200 kcal” rule; based on your body stats and activity.
Timeline planning — See estimated weeks to goal or work backward from a target date.
TDEE transparency — Know your maintenance calories before cutting.
Safety guardrails — Warning when deficit exceeds 1,000 kcal/day; BMR floor on extreme rates.
Actionable recommendations — When to recalculate and how to adjust using scale trends.
PDF export — Save or share results with a coach or dietitian.

How to Use This Calorie Deficit Calculator

Choose units — Metric or imperial to match your scale.
Enter sex, age, current weight, height — Use current measurements.
Select activity level — Match a typical week, not a single hard training day.
Enter goal weight — Must be below current weight.
Pick timeline — Weekly loss rate (0.25–1 kg/week) or target date.
Calculate — Review daily target, TDEE, deficit, and weeks to goal.
Heed safety warnings — Slow down rate or extend timeline if deficit is too large.
Track for 2–3 weeks — Adjust ±100–200 kcal if weight is not moving as expected.
Recalculate — Every 4–6 weeks or after ~5% body-weight loss.

Weight Loss Strategies During a Deficit

Nutrition

Prioritize protein (1.6–2.2 g/kg body weight)
Fill plates with vegetables and fiber for satiety
Limit liquid calories and ultra-processed snacks

Training

Resistance training 2–4×/week to preserve muscle
Keep daily steps up (NEAT supports TDEE)
Avoid excessive cardio that spikes hunger without recovery

Recovery

Sleep 7–9 hours—poor sleep increases hunger hormones
Manage stress; cortisol can affect water retention
Weigh weekly (same conditions) not daily for trend clarity

Understanding Your Results

Daily calorie target

Your eating goal to hit the selected weekly loss rate. Track intake near this number for 2–3 weeks before adjusting.

Daily deficit

TDEE minus target. Moderate deficits (250–750 kcal) are sustainable for most adults. Above 1,000 kcal triggers a safety warning.

Estimated weeks

Projected time to reach goal weight. Real progress varies with adherence, water shifts, and metabolic adaptation—recalculate as you lose weight.

Common Calorie Deficit Mistakes

1. Choosing an unrealistic timeline

Wedding or vacation dates can push deficits above 1,000 kcal/day. Extend the timeline or adjust goal weight for a sustainable rate.

2. Eating below BMR long-term

Deficits should be based on TDEE, not BMR. Chronic under-eating at resting levels can reduce muscle and metabolic health.

3. Overestimating activity level

Three gym sessions with a desk job is usually “moderately active,” not “very active.” Inflated TDEE = stalled fat loss.

4. Never recalculating after weight loss

A lighter body burns fewer calories. The same deficit target may stop working after 4–6 weeks—recalculate TDEE and deficit.

5. Ignoring protein and strength training

Without adequate protein and resistance work, a large share of weight lost can be muscle—not fat—making long-term maintenance harder.

Why Deficit Size Matters

A larger deficit produces faster scale change but also increases hunger, muscle-loss risk, and metabolic adaptation if sustained too long. Most people succeed with a moderate approach: consistent protein, resistance training, sleep, and a deficit they can adhere to for months—not days. Track weekly average weight for 2–3 weeks, then adjust calories by ±100–200 kcal if progress stalls or is too fast.

The Science Behind Calorie Deficit Estimates

The 7,700 kcal/kg rule is a population average for body-fat energy density—it does not account for water loss, glycogen depletion, or lean tissue changes that affect scale weight in the first weeks of a diet. Formula-based TDEE is a starting estimate; individual metabolism, NEAT, sleep, stress, and body composition can shift actual needs by 10–20%. The most reliable real-world check is tracking intake and weekly average weight for 2–3 weeks, then adjusting calories until progress matches your goal. Pair deficits with adequate protein and resistance training to preserve lean mass.

Factors That Affect Your Deficit Needs

Higher deficit tolerance

Higher starting body weight (more energy reserves)
High protein intake and resistance training
Good sleep and low chronic stress
Gradual step-down rather than sudden large cuts

Need a gentler deficit

Already lean or near goal weight
History of yo-yo dieting or eating disorders
High training volume without recovery
Pregnancy, breastfeeding, or medical conditions

Related Tools on This Site

Pair this calculator with our TDEE Calculator, BMR Calculator, Macronutrient Calculator, Protein Target Calculator, Calorie Calculator, and BMI Calculator for complete weight-loss nutrition planning.

Frequently Asked Questions (FAQs)

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Calorie Deficit & Weight Loss Calculator

User information

Body stats

Activity level

Weight loss goal

How this Calorie Deficit & Weight Loss calculator works

Calorie Deficit & Weight Loss Calculator – Daily Target, TDEE & Timeline

What Is a Calorie Deficit?

1What You Enter

Required inputs

Tips for accuracy

2Formulas We Use

Basal metabolic rate (BMR)

Total daily energy expenditure (TDEE)

Daily calorie target for weight loss

Timeline & safety rules

3What Your Results Include

Activity Multipliers Reference

BMR vs TDEE vs Calorie Deficit Target

Calorie Deficit Calculator vs TDEE vs Calorie Calculator

Weekly Loss Rate Guide

Sample Calorie Deficit Calculations

Example A (moderate loss)

Example B (gentle loss)

Example C (target date)

Benefits of Using This Calorie Deficit Calculator

How to Use This Calorie Deficit Calculator

Weight Loss Strategies During a Deficit

Nutrition

Training

Recovery

Understanding Your Results

Daily calorie target

Daily deficit

Estimated weeks

Common Calorie Deficit Mistakes

1. Choosing an unrealistic timeline

2. Eating below BMR long-term

3. Overestimating activity level

4. Never recalculating after weight loss

5. Ignoring protein and strength training

Why Deficit Size Matters

The Science Behind Calorie Deficit Estimates

Factors That Affect Your Deficit Needs

Higher deficit tolerance

Need a gentler deficit

Related Tools on This Site

Frequently Asked Questions (FAQs)

What is a calorie deficit?

How many calories should I eat to lose weight?

What formula does this calorie deficit calculator use?

Why is there a safety warning above 1,000 kcal/day deficit?

Should I eat below my BMR to lose weight faster?

What is the difference between TDEE and a calorie deficit target?

How do I choose a weekly loss rate?

Can I use a target date instead of a weekly rate?

How accurate is this calorie deficit calculator?

Do I need to recalculate as I lose weight?

Will my deficit stay the same throughout my diet?

Is this calculator suitable for everyone?

Related Calculators

Ideal Body Weight Calculator

Fiber Intake Calculator

Reverse Diet Calculator

Ketogenic Diet Macro & Calorie Calculator

Healthy Weight Gain & Muscle Building Calculator

Weight Loss Goal & Timeline Calculator

Daily Steps Target Calculator

Walking to Lose Weight Calculator

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