| Manufacturer | Google (Fitbit) |
|---|---|
| Type | Fitness tracker |
| Series | Charge |
| Released | October 2023 |
| Price at launch | £139.99 |
| Predecessor | Fitbit Charge 5 |
| Successor | Google Fitbit Edge, announced 12 October 2026. See the Fitbit tracker upgrade guide. |
| Band size | Small (130mm to 170mm) and large (170mm to 210mm), both included in the box |
| Colours | Coral/Champagne Gold Aluminium, Porcelain/Silver Aluminium, Obsidian/Black Aluminium |
Specifications and features as at launch.
Expert opinion | What’s new versus Charge 5 | Specifications | Battery life | Features | Sensors and health features | Further reading
Expert opinion
The Fitbit Charge 6 is a top-tier everyday health and fitness tracker. It offers excellent sleep tracking, comprehensive health metrics including ECG, HRV and skin temperature, and improved optical heart rate accuracy derived from Google Pixel Watch algorithms, alongside useful smart features like Google Wallet and Google Maps.
Its built-in GPS remains unreliable, and it lacks an altimeter for floor tracking. The simplified three-zone heart rate model and minimal post-workout metrics fall short of what serious runners or endurance athletes need for deep training analysis. It is an outstanding daily wellness device for general fitness enthusiasts, but dedicated sports watches from Garmin or Coros remain better suited to performance tracking.
Fitbit Charge 6
Fitness tracker with SpO2 and skin temperature sensing, Cardio Fitness Level, Sleep Score and up to 7 days of battery life. Heart rate tracking is rated up to 60% more accurate than other Fitbit trackers during vigorous activity.
What’s new versus Charge 5
Hardware
- A haptic side button returns for the first time since the Charge 3. The Charge 5 relied on touchscreen gestures only, which struggled with sweat, water or gloved hands. The button wakes the display, returns to the clock face and moves through the interface without a screen tap.
- The case is 1.8mm taller, 4.3mm narrower and 0.5mm thicker than the Charge 5. The design and display are otherwise unchanged.
Software
- A machine learning heart rate algorithm, adapted from the Google Pixel Watch, replaces the Charge 5’s model. Google states it is up to 60% more accurate during vigorous activity such as HIIT, spinning and rowing.
- Workout modes expand from the Charge 5’s 20 to more than 40 on the Charge 6, including HIIT, CrossFit and skiing profiles.
- The Charge 6 can broadcast heart rate over Bluetooth to gym equipment, including Peloton bikes and NordicTrack machines. The Charge 5 has no equivalent feature.
- Google Wallet replaces Fitbit Pay for contactless payments.
- Google Maps and YouTube Music controls are new additions, both absent from the Charge 5.
- Pace alerts for walking, cycling and running, plus distance and time goal setting, are new to the Charge 6.
Specifications
| Display | |
|---|---|
| Type | AMOLED |
| Cover glass | Corning Gorilla Glass 3 |
| Physical | |
| Dimensions | 36.73mm (L) x 23.09mm (W) x 11.20mm (H) |
| Weight | 30.00g |
| Materials | Silicone band with loop and peg closure |
| Water resistance | 50 metres (5 ATM, ISO 22810:2010) |
| Sensors and positioning | |
| Positioning | Built-in GPS and GLONASS |
| Heart rate | Optical heart rate monitor |
| Motion | 3-axis accelerometer |
| Blood oxygen | Red and infrared SpO2 sensors |
| Skin temperature | Device temperature sensor, variation shown in the Google Health app |
| Electrical | ECG app and EDA Scan app compatible |
| Other | Ambient light sensor, vibration motor |
| © the5krunner. Link required. | |
| Connectivity and storage | |
| Radio | Bluetooth, NFC |
| Sync range | Up to 30ft (9m) |
| On-device storage | 7 days of minute-by-minute motion data, 30 days of daily totals, heart rate at 1-second intervals during exercise and 5-second intervals otherwise |
| Operating temperature | -10°C to 45°C |
| Maximum altitude | 8km |
Battery life
| Mode | Battery life |
|---|---|
| Typical use | Up to 7 days |
| Charge time, 0 to 100% | 2 hours |
| © the5krunner. Link required. | |
Battery type is lithium-polymer. Google states the 7-day figure is based on testing with default settings and a median usage profile; the always-on display and SpO2 tracking both require more frequent charging.
Features
The Charge 6 pairs with the Google Health app, which replaced the Fitbit app, and requires a Google account.
- Cardio Fitness Level estimates VO2 max from heart rate and activity data.
- Sleep Score rates the previous night’s sleep.
- SmartTrack automatically detects and logs workouts without a manual start.
- Stress Management Score gives a daily score based on the body’s physical response to stress, drawing on the EDA sensor.
- Smart notifications cover calls, texts, calendar alerts and app notifications, including Gmail and Google Calendar.
- Three months of Google Health Premium are included at launch, unlocking AI-based coaching built with Gemini. It renews at £7.99 a month after the trial.
Sensors and health features
The SpO2 and skin temperature sensors are not available in all countries and are not intended for medical diagnosis; Google positions them as wellbeing tools rather than clinical measurements. The ECG app and irregular heart rhythm notifications are restricted to select countries and are not intended for users under 22 or those with known arrhythmias, with heart rhythm data recorded only when the wearer is still or sleeping.
The EDA Scan app measures skin conductance changes linked to stress. Advanced analytics for these metrics require a Google Health Premium subscription.
Quick answers
What is the difference between the Fitbit Charge 6 and Inspire 3?
The Charge 6 adds built-in GPS, Google Wallet payments, ECG and EDA stress scans, and a bigger colour screen. The cheaper Inspire 3 uses your phone’s GPS and has none of those, but lasts longer between charges.
Is the Fitbit Charge 6 waterproof?
Yes. It is water resistant to 50 metres (5 ATM), so you can shower and swim with it.
How long does the Fitbit Charge 6 battery last?
Up to 7 days, and a full charge takes about 2 hours. The always-on display and SpO2 tracking shorten it.
Has the Fitbit Charge 6 been replaced?
Yes. The Fitbit Edge replaced it on 12 October 2026, with a bigger screen, better GPS and an altimeter, but no NFC payments.
Further reading
- Google Fitbit Edge specifications, the Charge 6’s successor
- Fitbit tracker upgrade guide
- How the Fitbit Edge leaked
- Google Fitbit specifications
- All specifications
Small things I always use
- Garmin 90-degree charging adapter: Charges your Garmin from any USB-C cable. Essential when travelling. I use one.
- Body Glide: The blue anti-chafe stick swimmers and runners carry. I use it.
- Speedo earplugs: Fewer ear infections and no cold-water dizziness. I use them.
- Dryrobe Advance: My winter changing robe for open-water swims. I use one. A cheaper option is the AONYIYI changing robe.
- Maurten: Race fuel that stays easy on the stomach. I use them.
- Beet It Sport nitrate shots: Beetroot shots I take in the days before a race. I use them.
- Garmin charging puck: The quickest way to top up before a session. I use one.
- Injinji: Toe socks that stop rubbing, so you run more. I use them.
- Ultimate toe protectors: Stop black toenails on long runs. They work. I use them.
- Compressport R2 v2 calf sleeves: My calf sleeves of choice. I use them.
- Cellucor C4: My pre-workout before hard sessions.
- TPU tubes: Schwalbe Aerothan, Tubolito and Pirelli SmarTube. Light, tiny spares. I use all three.
- G8 insoles: Adjustable insoles that are good. I use them.
- Cycplus Cube: A 97g electric pump that gets a road tyre rideable in two minutes. I carry one. 5% off with code THE5KRUNNER.
Watches and sensors
- Polar H10: My daily driver for waking HRV.
- Polar Verity Sense: My backup arm-worn HR sensor.
- Nomad bedside charger: Charges my iPhone and Apple Watch overnight. I use it, and many of their bands.
- Train.Red: The best muscle oxygen sensor I’ve used.
- Tymewear: Accurate heart rate and reliable ventilatory zones. I use it to pace endurance rides over an hour.
- Garmin Forerunner 970: A pro-grade triathlon watch. I use this.
- Apple Watch Ultra 4: My daily smartwatch. No phone needed on rides.
- Garmin Fenix 9 Pro: I’ve just bought one.
On the bike
- Continental GP5000 for everyday riding, and Aero 111 on the front for special occasions.
- Helmets: Specialized S-Works Evade 3 for road riding, and Rudy Project Wing for TT-style races. I use both.
- Ravemen FR300: A front light that mounts under your Garmin or Wahoo. I use one.
- Ravemen FR1000: The light and the computer mount in one unit, so nothing else goes on the bars. Better than mine.
- Ravemen FR1500SE: 1,500 lumens hanging under your Garmin, for proper night rides.
- Ravemen FR1100SE: 1,100 lumens under your Garmin, and up to 46 hours on slow flash.
- Ravemen FR500: A brighter FR300 with the same mount.
- Wahoo TRACKR Radar: I use it on one bike and Varia on the other. They perform the same.
- Garmin Varia RTL515: Radar that warns you of cars from behind. I use this model.
- Wahoo ELEMNT Roam 3: The bike computer that’s easy to use. I use mine on most rides.
- Favero Assioma Pro RS2: Accurate power pedals that swap easily between bikes. I use this model.
Home and indoor training
- NPE Runn: Makes my basic treadmill smart, sending more accurate speed and distance to my watch and Zwift. I use it.
- Google Wifi: Keeps Zwift connected in my pain cave. I use it.
- Apple TV 4K: Zwift on the big screen. I use two.
- Google Nest Doorbell (wired, 2nd gen): My video doorbell, running in both Google Home and Apple Home. I use it.
Health, recovery and sleep
- FreeStyle Libre 3 Plus: Shows how my blood sugar responds to diet.
- hDrop: Measures my sweat loss in summer and indoors.
- Fourth Frontier Zone: Checks my heart under load in hard sessions.
- Kineon MOVE+: Red and infrared light for sore knees, Achilles and other joints after hard training. I use it.
- Oura Ring 5: My partner’s recovery tracker of choice.
- Eight Sleep: A cooling mattress cover my partner and I use nightly.
Reader-Powered Content
This content is not sponsored. It’s mostly me behind the labour of love, which is this site, and I appreciate everyone who supports it.
Support the site: Follow (free, fewer ads) · Subscribe (paid, ad-free) · Buy Me A Coffee
Written by real people, with AI assistance. Fact-checked and verified for originality. See the Editorial Policy. FTC: Affiliate Disclosure — some links pay commission. As an Amazon Associate, I earn from qualifying purchases.
