Weigh yourself with a Fitbit Aria series scale and sync with the Fitbit app to track your weight data and trends over time.
Set up your Fitbit scale with the Fitbit app for iPhones and iPads or Android phones. For more information, check How do I set up my Fitbit device?
If you have trouble setting up your device, check Why can't I set up my Fitbit device? For help syncing your device, check How do Fitbit devices sync their data?
If you're unsure which scale you own, turn the scale over and remove the battery cover to check how many batteries it contains:
- Aria uses 4 AA batteries
- Aria 2 uses 3 AA batteries and has “Aria 2†written on the back of the scale
- Aria Air uses 3 AAA batteries.
| Aria Air | Aria 2 | Aria | |
|---|---|---|---|
| Weight | ✓ | ✓ | ✓ |
| Body Fat % | ✓ | ✓ | |
| BMI (in the Fitbit app)* | ✓ | ✓ | ✓ |
Where do I check my BMI in the Fitbit app?
Android
- From the Today tab
, tap the Weight tile.
- Tap the BMI button under the graph.
, tap the Weight tile.iPhone
-
From the Today tab
- Swipe left on the graph.
For Aria 2, you can also check your BMI on the scale:
- From the Today tab
, tap the devices icon
Aria 2
- Choose to show body fat percentage and BMI on your scale. The next time you weigh in and the scale syncs, the settings are saved.
Aria 2Note: To change the units of measurement shown on your scale, check How do I change the units of measurement in my Fitbit account?
Aria and Aria 2 have two modes to calculate body fat percentage. The default is “regular†mode, which applies to most people. “Lean†mode is intended for professional or very high-level athletes with exceptionally low body fat relative to their muscle mass.
Note that Aria Air doesn't calculate body fat percentage.
If your scale’s current mode appears to give you an incorrect body fat percentage reading, try switching modes:
- From the Today tab
.
- Tap your scale
- Turn Lean Mode on or off. The next time you weigh in and the scale syncs, the mode switches and your body fat percentage is calculated with the mode you selected.
- On the Fitbit settings page, click your scale under the Devices menu.
- In the People section, click your name.
- Choose the appropriate mode. The next time you weigh in and the scale syncs, the mode switches and your body fat percentage is calculated with the mode you selected.
Edit your weight data in the Fitbit app. For more information, check How do I add, edit, or delete Fitbit data and activities?
To erase your scale, check How do I erase my Fitbit device?
Note: For error messages, check Why isn't my Fitbit scale working? For information about user icons, check How do I set up my Fitbit device?
| Icon | Meaning |
| Your weigh-in is complete. Step off the scale. | |
| Your scale wasn’t done weighing you. Step back on the scale to complete your weigh-in. | |
| Your measurements are close to those of another user and the scale is unsure who you are. If the user icon shown is yours, tap the right side of the scale with your foot. If the user icon is not yours, tap the left side of the scale. | |
| Your scale is connecting to your Wi-Fi network. | |
|
or |
Your scale successfully connected to your Wi-Fi network or the scale completed an update. |
| Your scale couldn’t connect to your Wi-Fi network or couldn’t complete an update. For more information, check How do I use my Fitbit scale? | |
| Your scale is going into standby mode until you step on it. | |
| Your scale is currently updating. Wait until the process completes before stepping on. | |
| Your scale is calibrating while it completes your weigh-in. Wait until you get your weight before stepping off. | |
| Your weight is unbalanced. Lean or shift your weight in the direction of the arrow. | |
| The scale is syncing with your Fitbit account. |
- From the Today tab
- On iPhones and iPads, tap People Using This Scale
- Choose from the list of your Fitbit friends or enter an email address, then tap the add user button
.
- On the Fitbit settings page, click your scale under the Devices menu.
- Click the pink Invite People button, then enter the email address of the person you want to add to the scale. If that person has a Fitbit account, use the email address that they use with Fitbit.
- From the Today tab
- Tap People Using This Scale or Users.
- Tap the person you want to remove.
- Tap Remove From Scale.
- On the Fitbit settings page, click your scale under the Devices menu.
- In the People section, click the trash can icon next to the person you want to remove from the scale.
Aria and Aria 2 measure body mass using bioimpedance analysis, which sends a small electric signal through the body. Don’t use Aria or Aria 2 if you have an implanted medical device such as a pacemaker, or if you’re pregnant. Consult your doctor if you have any questions about using these devices.
Aria Air doesn’t use bioimpedance analysis and there are no restrictions on use if you are pregnant or have an implanted medical device.
Your scale might not be linked to your account in the Fitbit app, or it might be assigning your weigh-ins to a guest. Follow the instructions in Why is my Fitbit scale recognizing me as a guest? to check whether your scale is correctly linked to your Fitbit account and your personal information is accurate.
If Aria or Aria 2 reads GUEST when you weigh yourself, verify that your scale is linked to your Fitbit account and that your Fitbit profile information is correct.
Aria 2 may assign your weigh-in to a guest when your measurements are similar to another user and the scale is unsure how to assign the weigh-in. When this happens, the scale shows an icon like the one below:
If the user icon shown is yours, tap the right side of the scale with your foot. If the user icon is not yours, tap the left side of the scale. If you do nothing, the weigh-in is assigned to a guest.
Note that for Fitbit Aria Air, if you saved a guest's weigh-in to your Fitbit account, you can delete the weight log. For more information, check How do I add, edit, or delete Fitbit data and activities?
, tap the devices icon 
. Your scale should be listed under your name.If you don't find your scale listed, your scale isn't linked to your Fitbit account. Follow the instructions in How do I set up my Fitbit device? to link your scale.
For Aria Air, make sure you have the Fitbit app open on your nearby phone when you complete a weigh-in.
- From the Today tab
- Tap Personal Stats and verify that your height and weight are correct.
- Weigh yourself 3 times to verify that your scale recognizes you.
- On the Fitbit settings page, verify that your height and weight are correct, then click Submit.
- Weigh yourself 3 times to verify that your scale recognizes you.
- From the Today tab
- Tap Recent Weigh-Ins.
- Tap the weigh-in you want to reassign.
- Reassign the weigh-in to the correct person.
Reconnect Aria or Aria 2 to your wireless network if you make changes to your network name, network provider, network password, or router.
Note that these instructions don't apply to Fitbit Aria Air.
- In a web browser, visit fitbit.com/scale/setup/start and click Get Started.
- Enter a name for your scale and your initials.
- When prompted, put your scale into setup mode by removing a battery from your scale, waiting 10 seconds, and then reinserting the battery.
- Your scale will show "Wi-Fi is (your network name)" followed by "Tap to change." With the palms of your hands, press down firmly and briefly (less than a second) on the lower two corners of the scale. You should find the message "Setup active" on your scale's screen. Note: If the screen is blank, you'll find the message "Step on," or if the message “Tap to change†scrolls across the scale’s screen, take out and reinsert a battery, then repeat the setup process.
- After you find the message “Setup Active,†follow the instructions in your web browser to complete the setup process.
- With your scale and Wi-Fi router nearby, open the Fitbit app on your phone.
- From the Today tab
- Tap Wi-Fi Network or Pair Scale to Different Network.
- Tap Next and follow the on-screen instructions to reconnect your scale to your network.
- From the Today tab
- Check the battery icon next to the name of your scale. The battery level is accurate as of the last sync.
If your scale's battery level is low, replace the batteries. If the battery level isn't low, remove the batteries for at least 10 seconds and reinsert them.
If your scale doesn't turn on after replacing the batteries, contact Customer Support.
| Replace batteries. For more information, check How do I check the battery level of my Fitbit scale? | |
| Step off the scale, and let the display reset. Then complete a weigh-in. | |
| The weight exceeds the scale’s limitations. The maximum weight Aria Air can detect is 397 pounds (180kgs or 28 stone: 5lbs). |
| Error Message | Issue | Troubleshooting Steps |
|---|---|---|
| WIFI ERR or NO SYNC (during setup) | The scale couldn't communicate with your Wi-Fi network. |
This error occurs most commonly when the network password is entered incorrectly or the router was not properly set up. It could also be due to a network firewall, MAC filtering, or the use of network extenders or repeaters. Verify that your password is correct and that your router is set to allow for the required 802.11b connection. If you're unsure of your Wi-Fi password, check How do I find my Wi-Fi network password and security setting? If you need assistance verifying your router's configuration, consult your router's manual or contact your internet provider. Before you try to set up your scale again, we recommend the following:
|
| NO SYNC or Wi-Fi symbol with an “X†(after weigh-in) | The scale can't communicate with your Wi-Fi network. |
This error occurs most commonly when the network settings are changed, such as when you set up a new router or change your network name or password. If you've recently changed your network settings, check How do I reconnect my Fitbit scale to my wireless network? If you're unsure of your Wi-Fi password, check How do I find my Wi-Fi network password and security setting? Verify that your router is powered on and that Aria is nearby. For troubleshooting steps, check Why won't my Fitbit device sync? |
| SENSING, THINKING, ERR | The scale can't measure your weight. | Remove the batteries for 10 seconds and reinsert them. Be sure the scale is placed on an even surface and weigh yourself again. If this error message persists, contact Customer Support. |
| GUEST | The scale can't identify the user who weighed in. | If your Fitbit account is linked to the scale, check Why is my Fitbit scale recognizing me as a guest? |
| Error Message | Issue | Troubleshooting Steps |
|---|---|---|
| WRONG PASSWORD | The Wi-Fi password is incorrect. | This error occurs most commonly if you changed your Wi-Fi password or entered it incorrectly during setup. Remember that your password is case-sensitive. If you recently changed your network settings, check How do I reconnect my Fitbit scale to my wireless network? If you're unsure of your Wi-Fi password, check How do I find my Wi-Fi network password and security setting? |
| CAN'T CONNECT | The scale can connect to the router but has no internet access. | Check your Wi-Fi connection with another device, such as a phone or computer. If that device can't connect to the internet while connected to your Wi-Fi network, restart your router. If you still don't have internet access, check that the router's cables are plugged in. |
| NO WIFI | The scale can't access the router. | Check that your router is on. If so, move your scale closer to the router and try setting up the Wi-Fi network connection again. For instructions, check How do I reconnect my Fitbit scale to my wireless network? If manually adding your network, be sure to select the correct security type. To find your network security type, check How do I find my Wi-Fi network password and security setting? |
| WEAK SIGNAL | The scale recognizes the router but can't connect to it. | Move your scale closer to your router. Make sure you're not using a public Wi-Fi network, including any network that requires you to accept terms and conditions or log in before use. |
| CONNECTION ERROR | The scale can't connect to your Wi-Fi network but the cause is unknown. | Move your scale closer to your router and make sure you're not using a public Wi-Fi network, including any network that requires you to accept terms and conditions or log in before use. If you receive this error more than four times in a row, wait a day before attempting another weigh-in. If this error message persists, contact Customer Support. |
| ! | The scale experienced a potential hardware failure. | Remove the batteries for 10 seconds and reinsert them. If this error message persists, contact Customer Support. |
| 1 | You remained on the scale for too long after completing a weigh-in. | Step off your scale after completing a weigh-in or when the scale shows the footprint icon moving backward, indicating it's time to step off the scale. If your scale continues to show this error when you weigh yourself, even after stepping off at the appropriate time, contact Customer Support. |
| 2 | Too much weight was placed on a section of the scale. | Weigh yourself again. If this error message persists, contact Customer Support. |
| 3 | The scale can't complete the weigh-in. | Weigh yourself again. If this error message persists, contact Customer Support. |
| 5 | The scale can't complete the weigh-in. | Weigh yourself again. If this error message persists, contact Customer Support. |
| 6 | Your weight wasn't centered on the scale. | Make sure your scale is on a flat, even surface. When you see an arrow on your scale, it means your weight was unbalanced and you need to move in the direction of the arrow. Weigh yourself again. |
| 400+ / 180+ / 28+ | The scale's maximum weight limit was exceeded. | The maximum weight Aria 2 can detect is 400 pounds (180 kilograms or 28 stone). |
| GUEST | The scale can't identify the user who weighed in. | If your Fitbit account is linked to the scale, check Why is my Fitbit scale recognizing me as a guest? |
| Blank screen after removing the plastic tab from the battery compartment | The batteries might not be inserted correctly. | Tap the scale with your foot to check if the screen turns on. If the screen remains blank, open the battery door on the back of the scale and remove the batteries. Reinsert the batteries and close the battery door, then check the scale's screen. Step on the scale to weigh yourself. |
If you're still having difficulty after completing the troubleshooting steps, contact Customer Support.
Note: If your scale isn't syncing with the Fitbit app, refer to Why won't my Fitbit device sync?​