Unit & Everyday Converters
Calorie & TDEE Calculator
Calculate daily calorie needs and TDEE based on age, weight, height, and activity level.
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The Calorie and TDEE Calculator determines your Total Daily Energy Expenditure (TDEE) — the number of calories you need to eat to maintain your current weight — using the scientifically validated Mifflin-St Jeor formula. TDEE is the single most important number for any diet or fitness goal: eat below TDEE to lose weight, at TDEE to maintain, or above to gain muscle.
The calculation starts with BMR (Basal Metabolic Rate) — calories burned at complete rest — and multiplies by an activity factor ranging from 1.2 (sedentary) to 1.9 (extremely active). For most Indian office workers and desk professionals, a sedentary to lightly active multiplier (1.2–1.375) applies, as daily commuting doesn't count as 'exercise'.
Evidence-based approach to using TDEE: a deficit of 500 kcal/day leads to ~0.5 kg fat loss per week (3,500 kcal ≈ 0.45 kg fat). Reducing too aggressively (below 1,200 kcal for women, 1,500 for men) triggers metabolic adaptation and muscle loss. A moderate deficit with high protein intake is the most effective sustainable approach.
How to use this utility
- Use the controls below—paste text, pick files, or adjust options as described on the tool.
- Click the main action button. Processing runs in your browser on this device.
- Download or copy the output. Check the processing note for any external services used by this operation.
Common use cases
- Setting daily calorie target for weight loss with a 500-calorie daily deficit
- Calculating maintenance calories when transitioning from weight loss to maintenance phase
- Planning nutrition for muscle building with 250–500 calorie surplus
- Estimating calorie requirements before starting a structured diet program
- Understanding why weight loss has plateaued despite eating less
Tips for best results
- 1Track calories for 2 weeks using MyFitnessPal to understand your actual intake vs calculated TDEE
- 2Protein intake of 1.6–2.2g per kg bodyweight preserves muscle during calorie deficit
- 3Muscle weighs more than fat — scale weight may be misleading; track body measurements too
- 4TDEE decreases as you lose weight — recalculate every 5 kg of weight loss
- 5Eating below BMR consistently is harmful — never go below BMR unless medically supervised
Frequently asked questions
- Is Konnect2Tools free?
- Yes. These in-browser tools are completely free to use with no account required for core functionality.
- Do my files leave my device?
- Browser document operations run locally, except where the operation uses an external service, such as AI summarisation. Read the processing note before using sensitive inputs.
- Is the Calorie & TDEE Calculator tool safe to use?
- Local operations process document content on your device. External-service operations may send inputs as described in the processing note. Keep originals and inspect the output.
- What is the difference between BMR, TDEE, and RMR?
- BMR (Basal Metabolic Rate) is calories at complete rest, zero activity. RMR (Resting Metabolic Rate) is similar but slightly higher as it's measured in non-fasting, non-sleeping conditions — RMR ≈ BMR × 1.1. TDEE (Total Daily Energy Expenditure) = RMR × activity factor. Use TDEE for your daily calorie target.
- How accurate is the Mifflin-St Jeor formula?
- Mifflin-St Jeor is the most accurate BMR prediction formula for most people, with about ±10% error. Factors it misses: body composition (more muscle = higher BMR), hormonal conditions (thyroid disorders significantly affect BMR), age-related muscle loss, and medications. For most healthy adults, it is a reliable starting point.
- How quickly can I lose weight safely?
- Safe rate: 0.5–1 kg per week for most people. This requires a 500–1,000 kcal/day deficit from TDEE. Faster loss risks muscle catabolism, gallstones, nutritional deficiencies, and metabolic slowdown. In the first 1–2 weeks, water weight loss (2–4 kg) creates a false impression of rapid fat loss.
- Why am I not losing weight despite eating at a deficit?
- Common reasons: (1) Calorie counting errors — restaurant portions are 40–60% larger than estimated; (2) TDEE recalculation needed — body adapts to lower intake; (3) Water retention masking fat loss — hormonal cycles, high sodium, new exercise routine; (4) Activity overestimation — 'moderate exercise' is often 'light' in practice. Try a 2-week food diary.
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