If your digital scale shows the wrong unit, check the unit indicator before changing calibration settings. An accidental button press, a startup default or a different operating mode can make a correct weight look unfamiliar.
The same item produces different numbers in grams, ounces, carats and other units. Changing the unit changes how weight is displayed; it does not change the item’s weight.
Use the documented UNIT or MODE control for your model, then confirm the unit symbol before recording the result.
Quick Guide to Wrong-Unit Problems
| What you notice | What to check | First action |
|---|---|---|
| Ounces appear instead of grams | Unit selection | Select g using the documented control |
| Unit changes after restarting | Startup default or memory behavior | Check whether the model saves the last selection |
| Display shows PCS | Piece-counting mode, if fitted | Return to normal weighing mode |
| Required unit never appears | Supported unit list | Confirm whether the model offers it |
| Button does not change units | Button function, lock or possible fault | Follow model-specific instructions |
| Numbers remain unexpected after selecting the right unit | Tare, setup or measurement performance | Verify with an appropriate reference |
The AWS product FAQ provides additional guidance on weighing modes and controls.
1. Read the Unit Symbol Beside the Number
Do not interpret the number without its unit.
Common abbreviations include:
| Symbol | Meaning | Typical application |
|---|---|---|
| g | Grams | General weighing |
| kg | Kilograms | Heavier loads |
| mg | Milligrams | Very small quantities |
| oz | Avoirdupois ounces | General ounce-based weighing |
| ozt | Troy ounces | Precious-metal weighing |
| ct | Metric carats | Gemstone weight |
| gn | Grains | Specialized weighing |
| dwt | Pennyweights | Jewelry and precious metals |
| lb | Pounds | Packages and larger loads |
| PCS | Piece count, where supported | Counting similar items |
Not every scale supports every unit or mode.
Grams and Grains Are Different
g means grams. gn commonly means grains. Selecting one when you intend the other produces a substantially different numerical result.
Ounces and Troy Ounces Are Different
oz and ozt are different mass units. Check the indicator carefully when weighing precious metals or following instructions that specify ounces.
Carats Measure Gemstone Mass
A metric carat equals 0.2 gram, according to the Gemological Institute of America’s carat-weight guidance. Carat weight is different from karat, which describes gold purity. www.gia.edu
2. Find the Correct Unit-Control Procedure
Many scales use a button labeled UNIT or MODE, but controls vary. Some bathroom scales use a separate selector, while other models use a multifunction button.
To change units:
- Identify the exact model.
- Find its operating instructions.
- Complete normal startup.
- Use the specified unit-selection control.
- Stop when the required symbol appears.
- Confirm ordinary weighing mode.
Find your model in the AWS product manuals.
Do not assume a long press performs the same action as a short press. On some models, holding a button may enter another function.
3. Check Whether the Scale Saves Your Selection
A scale may remember the last unit or return to a default after shutdown. This behavior is model-specific.
If the unit changes after restarting:
- Check the manual’s startup description.
- Confirm whether a save procedure exists.
- Check whether battery removal affects stored settings.
- Select the intended unit before each measurement if required.
Do not assume a return to the default means the scale is defective.
If the behavior differs from the manual, record the sequence and contact support.
4. Confirm That You Are in Weighing Mode
A display showing PCS may indicate piece-counting mode rather than weight. Other functions, where available, can also change the displayed result.
Return to normal weighing mode using the documented procedure.
Avoid random button combinations. If you accidentally enter calibration or setup, follow the instructions for exiting without changing settings.
The AWS scale FAQs provides further operating guidance.
5. Check Whether the Required Unit Is Supported
Pressing the unit button will not add a unit the model does not offer.
Check the specification list for your exact model and version. Similar-looking scales can support different selections.
If your required unit is unavailable, consider whether a suitable conversion meets your needs or whether a different model is more appropriate.
Changing Units Does Not Improve Resolution
Switching from grams to milligrams does not create additional measurement capability. Likewise, selecting ounces does not increase capacity.
NIST’s weighing and scales FAQs explains scale divisions and related terminology. Display increments and measurement performance must be evaluated separately. www.nist.gov
6. Distinguish Weight Units From Volume Estimates
Some kitchen scales offer milliliter or fluid-ounce modes. These may calculate volume from measured mass using an assumed density.
If your model includes these functions, check which substances and assumptions the instructions specify. A volume mode intended for water should not automatically be treated as suitable for every liquid.
For ordinary mass measurements, select an appropriate weight unit.
7. Investigate a Unit Button That Does Not Respond
If the expected control does not work, check:
- Whether startup has finished
- Whether the button has another function in the current mode
- Whether a documented lock is active
- Whether the model requires an empty platform
- Whether the button is obstructed or damaged
- Whether power is intermittent
Clean accessible surfaces only as instructed. Do not pry out a button or spray liquid into the housing.
Follow the AWS maintenance guide.
If resets, flickering or low-battery warnings occur too, check power. Energizer’s battery-care guidance recommends the specified battery type and advises against mixing old and new batteries. energizer.com
8. Verify the Result After Selecting the Unit
Once the intended unit appears:
- Confirm a stable empty-platform zero.
- Check tare.
- Place an appropriate reference gently in the center.
- Wait for a settled reading.
- Compare the result with the reference and model specifications.
Do not use a familiar-looking number alone as proof that the unit is correct.
NIST’s guide to uncertainty for balances and scales discusses reference quality and other influences on measurement results. www.nist.gov
The U.S. Mint publishes nominal coin specifications, but an individual coin is not a replacement for a suitable calibration reference. www.usmint.gov
Will Calibration Fix the Wrong Unit?
No. Calibration and unit selection are separate functions.
If the correct unit resolves the unexpected number, no calibration adjustment is indicated by that issue alone.
If an appropriate reference still gives a stable result outside specifications, follow the model’s calibration guidance. Read the AWS guide on how to calibrate a digital scale.
Never adjust a scale to make an ounce reading match an expected gram value.
When to Contact Support
Seek help if:
- A supported unit cannot be selected.
- The unit changes without an explained action.
- The control is stuck or damaged.
- Display segments make the unit unreadable.
- Settings behave differently from the manual.
Provide the model number, current unit, desired unit and steps already tried. Contact American Weigh Scales support.
For commercial transactions, use the units and device configuration required for the application. NIST Handbook 44 contains technical requirements for applicable commercial weighing devices; state and local requirements also matter. www.nist.gov
Frequently Asked Questions
How do I change my digital scale from ounces to grams?
Use the unit-selection procedure in the manual. Many models use UNIT or MODE, but controls vary.
Why does my scale return to ounces after restarting?
It may use a startup default. Check whether your model saves the last unit or requires selection each time.
What does gn mean?
It commonly means grains, not grams. Grams are usually shown as g.
What does PCS mean?
On models with counting functionality, PCS indicates piece count rather than weight.
Does changing units change accuracy?
No. It changes the representation of the measurement, not the scale’s underlying capability.