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Goal Weight Date Calculator

Enter your current weight, goal weight, daily calorie deficit, and start date.

How it is calculated

The tool converts the weight to lose into a calorie total and divides it by your daily deficit. total deficit = (current − goal) × 3,500 and days = total deficit ÷ daily deficit, rounded up to a whole day (for example 8.75 days becomes 9). Weights are in pounds, the deficit is in kcal per day and the 3,500 kcal per pound rule is built in. Weeks are days ÷ 7. The target date is the start date (typed as YYYY-MM-DD) plus that many days. The same deficit is assumed on every single day, including weekends, and maintenance needs are assumed not to fall as you get lighter, so the real date is usually later. No result is shown if the goal is not below the current weight, the deficit is zero or negative, or the date is not a real calendar date.

Worked example

Current weight 200 lb, goal 185 lb, deficit 500 kcal per day, start 2026-01-05. Weight to lose: 200 − 185 = 15 lb. Total deficit: 15 × 3,500 = 52,500 kcal. Days: 52,500 ÷ 500 = 105 days, which is 15.00 weeks. Counting 105 days from 5 January 2026 gives the target date 2026-04-20.

Try this example →

Common mistakes

  • Entering your total calorie intake instead of the deficit; the field is the number of kcal below maintenance each day.
  • Using kilograms for the weights, since the 3,500 kcal rule applies per pound and the date would come out far too soon.
  • Assuming a 500 kcal deficit is easy to hold every day without checking your real maintenance; if maintenance is overestimated the actual deficit is smaller.
  • Typing the start date in a local format such as 05.01.2026 or an impossible date such as 2026-02-30; only a real YYYY-MM-DD date gives a result.
  • Entering a goal weight equal to or above the current weight. The tool only projects weight loss, so it shows nothing.

Sources

About this calculator

This calculator projects the date you would reach a goal weight based on the classic 3,500-kilocalorie-per-pound rule, first proposed by Max Wishnofsky in 1958: since one pound of body fat is estimated to store about 3,500 kcal, a sustained daily calorie deficit divided into 3,500 tells you roughly how many days it takes to lose one pound.

The rule is widely used in weight-loss apps and calculators because it turns an abstract calorie deficit into a concrete, motivating timeline, but it is a simplification: as weight loss progresses, maintenance calorie needs drop (since a smaller body burns fewer calories) and metabolic adaptation can slow progress further, so real-world results tend to land somewhat behind a straight-line 3,500 kcal projection, especially over longer timeframes.

Enter your current weight, goal weight, daily calorie deficit, and a start date, and this calculator projects the date you would hit your goal weight under the 3,500 kcal per pound assumption. Hall et al. (Lancet, 2011) showed that this static rule overstates long-run change, because energy expenditure adapts as weight changes, so over months real change is slower than this projection.

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