Fat-loss timeline guide

How long does it take to lose 15 kg?

Use the calculator below to turn your goal into a realistic calorie target, macro plan, expected weekly rate, and estimated goal date.

1. Enter your starting point

Weight, height, age, training, and body-fat estimate.

2. Choose a pace

Select a rate you can realistically sustain.

3. Track the trend

Use weekly averages to keep the forecast honest.

CutForecast Personal cutting plan

Your personalised calculator

Predict how long it will take to reach your goal body fat using calorie deficits, training frequency and realistic fat-loss modelling. Drag the graph to simulate cheat days and watch your timeline adjust.

Your plan saves automatically on this device
1

Your Stats

Weight

Body Fat %

Training Days

Sex

Age

Height

Your page goal

Lose 15 kg from your current weight

Your forecast will calculate a goal date and estimated body-fat change for this amount.

Choose your preferred pace

Your forecast uses this starting deficit and gives you full control to adjust calories and steps afterwards.

Recently started dieting (water weight drop)
2

Your Plan

Your personalised targets will appear here.

Generated with CutForecast.com

Try dragging the points to simulate cheat days — the rest of the plan will adjust.

Weight loss often slows due to metabolic adaptation. The blue line shows what may happen if you increase your deficit later in the cut.

Weight Loss Calculator

This weight loss calculator estimates how long it will take to reach your target body fat based on your calorie deficit, body weight, and training frequency. Enter your current stats above to generate a personalised fat-loss forecast and timeline.

How does the calculator work?

Fat loss occurs when you consistently maintain a calorie deficit. Roughly 7700 calories correspond to one kilogram of body fat. This calculator estimates your maintenance calories, predicts your weekly weight loss, and generates a realistic timeline to reach your goal.

How fast can you lose weight safely?

Most people can safely lose around 0.5–1% of their body weight per week. Faster weight loss can increase the risk of muscle loss and metabolic slowdown. A moderate calorie deficit combined with resistance training usually produces the best long-term results.

Is this weight loss calculator accurate?

This calculator provides an estimate based on metabolic formulas and typical fat-loss patterns. Real results may vary depending on diet adherence, sleep, stress, and training intensity.

Popular fat loss timelines

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Common questions about losing 15 kg

How quickly can I safely lose weight?

A sustainable pace is often around 0.5% to 1% of body weight per week. The right pace depends on your current body fat, training, recovery, and how well you can maintain the plan.

How accurate is a weight-loss timeline?

A calculator provides an estimate, not a guarantee. Water retention, daily activity, food tracking accuracy, and adherence can all move the scale. Use weekly average weights to judge real progress.

What should I do if progress slows?

Check your weekly average, calorie tracking, step count, sleep, and training consistency before making changes. Small, measured adjustments are usually more sustainable than a large calorie cut.