Most scales have a mode button that cycles through units like kg and lbs. Hold it for 2–3 seconds until your preferred unit appears. Older models may have a physical switch on the bottom instead. Note that some scales reset to a default unit after removing batteries, so check your manual.
Here's the thing: your scale remembers whatever unit you pick. Flip it over or find the mode button — usually on top or along the side — press and hold it, and watch the display cycle through kg, lbs, and sometimes stone. That's genuinely it. Most people never touch this setting, which is understandable, but it's one of the simplest things your scale does. If nothing happens when you press the button, check underneath. Some older models have a small mechanical toggle switch on the bottom that flips the measurement system without needing any button press at all — and you might need a toothpick to nudge it.
The most common reason? Moving countries or syncing with a fitness app. Say you relocated from the US to Germany — suddenly every gym scale, doctor's office, and food label is in kilograms, and your bathroom scale still reads 180 lbs. That disconnect gets annoying fast. Americans use pounds by default. Europe, Australia, and Canada use kilograms. If you're logging weight in MyFitnessPal or Fitbit, your physical scale needs to match what the app expects, otherwise you're doing mental math every single morning. Athletes competing internationally sometimes keep a scale set to each unit just to avoid mix-ups before weigh-ins — small detail, real consequence.
Let's clear up what changing units actually does and doesn't do. Flipping from kg to lbs doesn't recalibrate anything. Your scale measures weight the same way no matter what number it displays. Another thing people get wrong: you don't need to recalibrate after switching units. The sensors work identically. And resetting to factory settings won't change your unit either (most scales hold onto that preference anyway). The weight your scale measures stays consistent. Only the display number changes.
Flip it over and look for a small toggle switch or recessed button on the back or base. You might need a toothpick to reach a recessed one. If you still can't find it, search your model name plus 'unit switch' — most manufacturers post short how-to videos for exactly this.
Nope. If your scale stored previous readings, it'll display all of them in your new unit automatically. The underlying data doesn't change — just the way it shows up on screen. So your old numbers won't disappear or look wrong.
Low batteries are the most likely culprit. When battery power dips, some scales lose their saved preferences and revert to the factory default. Swap in fresh batteries, reset your unit, and you should be fine. If it keeps reverting with brand-new batteries in, that's a firmware or hardware fault — contact the manufacturer.