Body Measurement Tracker

The scale doesn't tell the whole story. Log your weight and tape measurements over time and see what's actually changing, from your waist to your arms.

Your details

kg
cm
cm
cm
cm
cm
cm

Fill in what you measured; you can skip the rest. Entries stay in this browser only: nothing is sent to us. Measure at the same time of day, on the same spot, each time.

Your results

No entries yet. Add today's measurements to start your log.

How to use it

  1. Pick the date, then fill in the measurements you took. You can skip any you didn't measure.
  2. Press "Save entry". Your log and your changes since the first entry appear next to the form.
  3. Measure every one to two weeks, at the same time of day and the same spot on your body.
  4. Use "Download as CSV" to keep a copy or open it in a spreadsheet. Delete any entry with its Delete link.

How it's calculated

What it stores. Each entry has a date and any of these measurements: weight, waist, hips, chest, upper arm, thigh and neck. Weights are stored in kilograms and lengths in centimeters, then shown in the units you pick. Up to 500 entries.

What it shows.

  • Main number: the change in your waist since your first entry (or weight, if you haven’t logged a waist twice).
  • Tiles: the change in every other measurement you’ve logged at least twice, from the first to the latest value.
  • Log: every entry, newest first.

Measuring consistently. The waist position follows the WHO protocol and NICE’s home instructions: halfway between your lowest rib and the top of your hip bone, after breathing out normally. The Navy Body Fat Calculator uses different tape sites, so measure separately for that method. A change of a centimeter or so can come from tape placement alone, so look at the trend over several entries.

Your data. Entries are saved in your browser’s local storage on this device and never leave it. The CSV download contains everything in your log, in the units currently selected.

Sources

  1. World Health Organization (2011). Waist circumference and waist–hip ratio: report of a WHO expert consultation, Geneva, 8–11 December 2008. Measurement protocol.
  2. NICE. Overweight and obesity management (NG246). How to measure your waist.

Questions

Where is my data stored?

Only in this browser, on this device. Nothing is sent to CleanReps or anyone else. That also means clearing your browser data deletes the log, so download a CSV now and then as a backup.

How often should I measure?

Every one to two weeks is enough. Daily changes are mostly water and food, so measuring too often mainly shows noise.

Where do I measure?

Waist halfway between your lowest rib and the top of your hip bone, after breathing out. Hips around the widest part of your buttocks. Chest at nipple height. Upper arm and thigh at their widest point, relaxed. Neck just below the Adam's apple.

Why track measurements and not just weight?

If you lift while losing fat, your weight can stay the same while your waist shrinks and your arms grow. Measurements show that; the scale doesn't.

Updated November 9, 2026.