Keto Diet Weight Loss Calculator

The table below shows a sample configuration for a moderately active person following a standard ketogenic deficit.

1. Basal Metabolic Rate (BMR)

This calculator uses the Mifflin–St Jeor equation. It estimates resting energy use from weight, height, age, and gender.

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

2. Total Daily Energy Expenditure (TDEE)

TDEE multiplies BMR by an activity factor that reflects daily movement and exercise level.

• Sedentary: 1.2
• Light: 1.375
• Moderate: 1.55
• Active: 1.725
• Very active: 1.9

3. Calorie deficit and target intake

You choose a deficit style. The calculator applies the percentage to TDEE to find target calories for fat loss.

Target calories = TDEE × (1 − deficit_percent ÷ 100)

4. Projected fat loss and timeline

One kilogram of body fat stores roughly seven thousand seven hundred kilocalories. The tool uses this relationship for weekly loss and time estimates.

• Daily deficit = TDEE − target calories
• Weekly deficit = daily deficit × 7
• Weekly fat loss (kg) ≈ weekly deficit ÷ 7700
• Weeks to goal ≈ (current − goal) × 7700 ÷ weekly deficit

5. Keto macronutrient distribution

The selected ketogenic macro profile defines percentages for carbohydrate, protein, and fat. The calculator converts percentages into grams per day.

• Carb calories = target calories × carb_percent ÷ 100; grams = calories ÷ 4
• Protein calories = target calories × protein_percent ÷ 100; grams = calories ÷ 4
• Fat calories = target calories × fat_percent ÷ 100; grams = calories ÷ 9

1. Example deficit presets and weekly loss estimates

The table below uses a reference TDEE of two thousand two hundred kilocalories per day. It illustrates how different deficit levels change estimated fat loss.

2. Sample keto macro splits at common calorie targets

These examples use a standard ketogenic profile with seven percent carbohydrate, twenty three percent protein, and seventy percent fat distribution.

3. Suggested weekly loss ranges by starting body mass

Higher starting body mass often tolerates slightly faster losses. The calculator’s deficit options can be aligned with these typical weekly ranges.

4. Carbohydrate bands and likely ketosis depth

The calculator can keep carbohydrate grams very low by adjusting the carbohydrate percentage downward while calories stay within a chosen deficit.

These carbohydrate ranges are general examples only. Individual tolerance and ketone responses can differ markedly between people with similar body sizes.

1. Enter gender and age so the equation can estimate resting energy needs accurately.
2. Provide height and current weight, choosing centimetres or inches, kilograms or pounds as preferred.
3. Set a realistic goal weight within a healthy range recommended by your clinician.
4. Choose your typical activity level. This factor scales resting energy to daily lifestyle demands.
5. Select a deficit style. Mild or moderate cuts are usually more sustainable than aggressive approaches.
6. Pick a keto macro profile or define your custom carbohydrate, protein, and fat percentages.
7. Press Calculate to see calories, macros, projected weekly loss, and approximate time needed to reach the goal weight.
8. Use the Download CSV and Download PDF buttons to export your results for tracking, planning meals, or discussing with nutrition professionals.

Always discuss significant dietary changes with a qualified healthcare provider, especially if you take medication or have medical conditions.

1. Is this keto calculator a medical device or diagnosis tool?

No. It is an educational planning tool, not medical advice. It cannot diagnose conditions, adjust medication, or replace professional guidance. Always discuss major diet changes, especially ketogenic diets, with your doctor or qualified dietitian first.

2. How low should I keep carbohydrates for ketosis?

Many people aim for twenty to thirty net grams of carbohydrate per day on weight loss keto. Some tolerate up to fifty grams. Your personal threshold varies, so track response, symptoms, and, if desired, blood or breath ketone readings.

3. Can I use this calculator for weight gain on keto?

Yes. Choose the maintenance option, then experiment with a small surplus instead of a deficit by manually increasing calories. Still prioritise adequate protein, minimally processed foods, and your clinician’s guidance if you have metabolic, digestive, or cardiovascular conditions.

4. What protein intake should I choose for fat loss?

Most people target between 1.6 and 2.2 grams of protein per kilogram of body weight per day during fat loss. Higher protein supports fullness, muscle retention, and better training recovery on an energy restricted ketogenic diet.

5. Why does the calculator include a calorie safety floor?

Very low calorie intakes increase risks of nutrient deficiencies, hormonal disruption, muscle loss, and strong hunger. The calculator uses eight hundred kilocalories per day as a generic minimum, but many people require significantly more. Personal advice should come from your own clinician.

6. How often should I recalculate my keto targets?

Recalculate whenever your body weight, activity level, or goals change meaningfully. Many individuals update every four to six weeks during active fat loss phases, or sooner after big training, schedule, or medication adjustments discussed with their healthcare team.

7. Does this calculator guarantee specific results on the scale?

No calculator can guarantee exact outcomes. Hormones, sleep, stress, food tracking accuracy, medical conditions, medications, menstrual cycle, and water retention all influence scale readings. Use projections as rough guidance only, and focus on long term behavioural consistency.