Weight loss percentage per week calculator
Compare two weigh-ins or two weeks of weights to see your observed weekly loss in pounds, kilograms, and percentage of body weight.
Free. No account required.
How the calculation works
For weekly averages, each period’s weight is the arithmetic mean of the weigh-ins you enter. Compare weeks with similar weigh-in timing and use the same weekday for both week start dates. The calculator does not fill missing days.
Weight lost = earlier weight minus later weight. Weekly loss = weight lost × 7 ÷ elapsed days. Weekly percentage = weekly loss ÷ earlier weight × 100. The earlier weight is the denominator for both total and weekly percentages.
Dates use calendar days, so daylight-saving changes do not alter the result. Weight gain is shown as gain rather than negative loss. The result describes the interval you entered; it does not predict your future rate or identify fat versus muscle or water changes.
A worked example
An earlier weekly average of 200 lb and a later average of 198 lb, with week start dates 14 days apart, means an average loss of 1 lb per week, or 0.5% of the earlier body weight per week.
Common questions
How is this different from the weight timeline planner?
The pace checker measures the change in weights you have already recorded. The timeline planner projects a possible schedule from a goal and chosen rate.
Why use weekly averages?
Averages combine several weigh-ins instead of relying on one reading at each end. Water, food, and timing can affect individual readings. Use comparable conditions and several days in each week.
Does this tell me whether to change calories?
No. First compare the observed rate with your goal, the completeness of your food log, and how long the trend has persisted. Zolt can help review that context and adapt your targets.
Can I use this during a bulk?
Yes. If the later weight is higher, the result shows the average weekly gain in weight and percentage of the earlier weight.