Calorie Deficit Calculator
Overview
Calculate safe daily calorie deficit for weight loss, see timeline projections, and plan sustainable fat loss with personalized recommendations
Key Facts
| Field | Value |
|---|---|
| Calculator ID | calorie-deficit |
| Category | Health |
| Vertical | Health & Fitness |
| App route | /verticals/health/calorie-deficit |
| API endpoint | /api/public/calculate?id=calorie-deficit |
Inputs
| Input ID | Label | Type | Required | Default | Constraints |
|---|---|---|---|---|---|
tdee | TDEE (Total Daily Energy Expenditure) | number | Yes | 2500 | min 1000, max 5000, step 50 |
unitSystem | Unit System | select | Yes | imperial | - |
goalLbs | Weight Loss Goal (lbs/week) | select | No | lose-1 | - |
goalKg | Weight Loss Goal (kg/week) | select | No | lose-0.5 | - |
How to Use
- Enter Your TDEE — Input your Total Daily Energy Expenditure (maintenance calories)
- Select Weight Loss Goal — Choose weekly target: 0.5-2 lbs per week based on your goals
- Get Your Plan — See daily calorie target, deficit amount, and weight loss timeline projections
Result Surfaces
| Output | Display Type | Format |
|---|---|---|
| Computed results | result-card | - |
Related Calculators
FAQ
What is a safe calorie deficit for weight loss?
500-1000 calorie daily deficit is safe, resulting in 1-2 lbs lost per week. Never go below 1,200 calories/day (women) or 1,500 calories/day (men) without medical supervision. Larger deficits risk muscle loss, nutritional deficiencies, and metabolic slowdown.
How long does it take to lose weight with a calorie deficit?
With a 500 calorie daily deficit (1 lb/week), expect 10 lbs lost in 10 weeks, 20 lbs in 20 weeks. With 1000 calorie deficit (2 lbs/week), double the rate. First 1-2 weeks include water weight, then fat loss becomes consistent.
Why am I not losing weight despite eating in a deficit?
Common reasons: underestimating food intake (use food scale), overestimating activity level, water retention (especially for women during menstrual cycle), not enough time (wait 2-3 weeks), or adaptive thermogenesis (metabolism slowdown). Recalculate TDEE based on real results.
Evidence
src/lib/calculators/registry.ts(metadata)src/lib/calculators/page-registry.ts(page/HowTo metadata)src/lib/calculators/health/calorie-deficit.ts(calculator config)