Weight loss percentage calculator

Enter your starting and current weights. You will see the percentage you have lost or gained right away. Add a goal or dates only if you want more detail.

Free · private in this tab

Calculate your change

Nothing is saved or sent to HealthspanLedger. Enter two weights to see the percentage change.

Your weights

Starting weightlbCurrent weightlb

Weight unit

Your result

Enter both weights

Your answer appears here as soon as both weights are filled in.

This shows what changed between the two weights. It does not predict future results or set a medical target.

Optional details

Add a goal or dates

A goal shows how far you have moved. Two dates show your observed weekly pace. Neither changes the main percentage.

Goal weightOptionallbWhen did you start tracking?OptionalResults throughOptional

The share link contains the weights and dates currently on screen. Anyone with the link can read them.

What the answer means

A simple percentage of your starting weight

Weight lost or gained

The calculator subtracts your current weight from your starting weight, then divides that change by your starting weight. For example, moving from 200 lb to 180 lb is a 10% loss.

Progress toward your goal

If you add a goal, the calculator compares how far you have moved with the full distance from your starting weight to that goal. It does not choose a goal for you.

About the weekly pace

Add a start date and an end date to see the average change per week across that period. It describes what already happened. It does not predict what will happen next or decide whether a pace is right for you.

Useful next steps

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