Turn maintenance calories into a clear daily target. Choose activity level and goal timeline smartly. Stay consistent, adjust as needed, and lose weight steadily.
These examples show typical inputs and estimated outcomes.
| Profile | Inputs | Outputs (estimate) |
|---|---|---|
| Male, moderate activity | Age 30, 178 cm, 82 kg, activity 1.55, deficit 500 | TDEE ~ 2750 kcal, intake ~ 2250, loss ~ 0.45 kg/week |
| Female, light activity | Age 28, 165 cm, 68 kg, activity 1.375, deficit 400 | TDEE ~ 2000 kcal, intake ~ 1600, loss ~ 0.36 kg/week |
| Male, very active | Age 40, 180 cm, 90 kg, activity 1.725, deficit 750 | TDEE ~ 3200 kcal, intake ~ 2450, loss ~ 0.68 kg/week |
The 7700 and 3500 values are common approximations for fat energy content.
A calorie deficit happens when you eat fewer calories than you burn. Your body covers the gap using stored energy from fat and glycogen. This calculator estimates change using common equivalents: about 7,700 kcal per kilogram and 3,500 kcal per pound.
Maintenance calories are your estimated Total Daily Energy Expenditure (TDEE). TDEE combines resting needs and daily activity. If you maintain weight near 2,400 kcal/day, then a 500 kcal/day deficit targets about 1,900 kcal/day. Maintenance shifts with steps, sleep, and stress.
Basal Metabolic Rate (BMR) is the energy your body uses at rest. The calculator estimates BMR from age, sex, height, and weight, then scales it with an activity factor to reach TDEE. BMR is not a goal intake; it is a planning baseline.
Activity multipliers approximate how movement adds to BMR. Sedentary fits desk work with little exercise, while moderate or active fits frequent training and higher daily steps. If your weight trend is stable, pick the level that matches your average week, not your best week.
Daily deficit drives the estimate. A 250 kcal/day deficit is roughly 0.23 kg/week, while 750 kcal/day is roughly 0.68 kg/week (using 7,700 kcal per kg). Larger deficits can be harder to sustain, and scale weight can fluctuate due to water and sodium.
Deficit mode lets you choose the gap, and the tool calculates your intake. Target-intake mode works backward: you enter calories you plan to eat, and it calculates the implied deficit. Both modes show scenarios so you can compare several deficit levels side by side.
Duration estimates multiply the weekly projection across your selected days. Because energy expenditure can decline as body weight drops, longer plans are best treated as checkpoints. If progress slows for two to three weeks, re-check activity, portions, and update your current weight.
Use consistent weigh-ins and track a 7-day average to reduce noise. Update your weight every few weeks and rerun the calculation. If you log intake, watch for oils, drinks, and snacks. Small daily gaps, like 150–200 kcal, add up over months.
No. It provides an estimate using population averages. Your true TDEE depends on activity, body composition, and adherence. Use the results as a starting point, then adjust based on 2–4 weeks of weight trends.
Water, sodium, glycogen, digestion, and hormones can change scale weight day to day. That is normal. Compare weekly averages rather than single weigh-ins to see your underlying direction.
Many people start with 250–750 kcal/day, but the best choice is one you can sustain while meeting protein, fiber, and micronutrient needs. If you feel unwell, reduce the deficit and seek professional guidance.
Maintenance is the calorie level where your weight trend stays roughly stable over time. The calculator estimates it as TDEE. If your weight is rising or falling, your actual maintenance may be higher or lower.
Yes, by entering a negative deficit (surplus) or selecting target intake above maintenance. For recomposition, small deficits and strength training are common, but results vary and are slower to measure on the scale.
Activity level scales BMR up to TDEE. Two people with the same BMR can have very different calorie needs based on steps, training, and job movement. Choosing a realistic activity factor improves the estimate.
Recalculate when your body weight changes noticeably, your training volume changes, or your weekly trend stalls. Updating every 2–4 weeks is a practical rhythm for many plans.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.