How Many Calories a Day Do You Need to Lose Weight?
Automated technical check: . Scope and review policy
There is no single calorie intake this calculator can prescribe for weight loss. DigiCalc estimates resting energy, multiplies it by an activity assumption, and shows arithmetic adjustments. It does not predict how many pounds or kilograms you will lose in a week.
Understand the resting formula
The Calorie Calculator implements Mifflin-St Jeor: 10 x weight in kg + 6.25 x height in cm - 5 x adult age, then +5 for the male formula or -161 for the female formula. The original research estimates resting energy expenditure; a formula result is not a direct metabolic measurement.
For the female formula at age 35, 72.7 kg and 165 cm, the unrounded resting estimate is 1422.25 kcal/day. With the illustrative 1.55 activity multiplier, TDEE is 2204.49 kcal/day, displayed as about 2204 kcal/day.
What a calorie adjustment actually means
Subtracting 500 from that unrounded estimate gives 1704 kcal/day after display rounding. This is arithmetic, not a prescribed intake or a promise of one pound per week. A daily 500 kcal adjustment totals 3,500 kcal over seven days; that multiplication alone is not a model of changing body weight.
The tool intentionally shows energy totals rather than translating them into an exact weight-loss timetable. Intake measurement, water changes, changing expenditure and individual circumstances mean the simple daily-gap arithmetic cannot supply that forecast. There is also no universal safe 1,200 kcal floor inferred by this tool.
The activity assumption matters
The five presets range from 1.2 to 1.9 times resting energy. Labels such as moderate summarize an assumption; the calculator cannot observe your movement, training, work or metabolism. Changing that assumption changes the estimated baseline before any adjustment is applied. See why calorie calculators disagree for the same inputs under different multipliers.
Scope and next decisions
This illustration accepts adult ages 18-120 and positive height and weight. An unsupported formula sex or activity option, nonfinite inputs or nonpositive resting estimate shows no result. Those software bounds do not establish that a nutrition plan is appropriate.
This is not for children, pregnancy or breastfeeding. Medical conditions, medications, eating-disorder history and nutritional adequacy are not evaluated. Seek individualized guidance for an intake plan rather than treating a positive output as permission to restrict food. NIDDK's Body Weight Planner is a separate time-dependent planning tool with its own scope; DigiCalc does not implement that model.
The Macro Calculator can convert illustrative totals to percentage-based grams, but it does not make the intake safer or more personalized. Enter maintenance calories there before selecting an adjustment, to avoid subtracting it twice.
Sources and Scope
Technical example checks are not independent professional review. Sources were checked for the statements above on October 6, 2026.