Simulation

Simulate Your Weight Loss Over Time

Starting at 200 lb with a 500-calorie daily deficit, you would reach about 172 lb after 12 months, losing roughly 1 lb per week. Adding 20% metabolic adaptation flattens the curve later, leaving you closer to 176 lb, because your body burns slightly fewer calories as you shrink. Drag the deficit and adaptation sliders to see how the path changes.

Results

Visualization

BodyStd provides educational estimates only, using established formulas such as the 3,500-calorie-per-pound rule and the Mifflin-St Jeor equation. These tools do not diagnose any condition and are not medical advice. Weight-loss results vary widely by individual. Consult a physician or registered dietitian before starting any diet, exercise, or weight-loss program.

How It Works

The simulator steps forward month by month. Each month it converts the daily deficit to pounds lost using 3,500 calories per pound and a 30.44-day month. If you set metabolic adaptation above 0, the effective deficit shrinks a little each month (by the chosen percentage of the timeline), which models how the body slightly lowers energy use as weight drops. The result is a smooth curve that can flatten near the end instead of a straight line.

What Should You Do?

Use this to set realistic expectations before you start. A 500-calorie deficit is a common, sustainable default; push the slider up only if you can keep it. The adaptation slider reminds you that later months slow down, so do not panic at a plateau. Re-run every month with your real current weight, because your true deficit drifts as intake and activity change.

Frequently Asked Questions

What is metabolic adaptation?

As you lose weight, your body often burns a bit less at rest, so the same deficit yields slower loss. The slider models that effect loosely.

Why does the curve flatten?

With adaptation on, the effective monthly deficit shrinks over time, so each month removes fewer pounds than the last.

Is 500 calories a good default?

For many adults it gives about 1 lb/week and is sustainable. Larger deficits are faster but harder to maintain.

Should I trust the final weight number?

It is a model, not a promise. Real loss depends on adherence, muscle gain, and water, which the simple model cannot capture.

How often should I re-simulate?

Monthly, plugging in your actual weight, keeps the projection honest as your maintenance calories shift.