Getting started
The basics.
The information provided here is critical to ensure proper usage of Calibre. We will be dynamically updating this page, ensuring existing users and new customers will understand, with clarity, the operational functionality of Calibre and how to utilize it for data accuracy and maximum benefit.
Download our checklist.
Before you dive into your first breath session, make sure you’ve got the fundamentals right. Download the official Calibre Setup Checklist, a quick and essential guide that ensures your device is calibrated, sealed, and ready for accurate data. Whether you're measuring RMR, VO2 max, or fat burn, this checklist is your starting point to unlock reliable insights from every breath. Don’t skip it. Your results depend on it.
Download the checklistCharging:
Always use the USB-C charging cable provided by Calibre and a standard 5V-2Amp max (non-accelerated) charging block, plugging it directly into a wall socket.*
It is important to initially fully charge the device prior to first use. The LED light will oscillate while charging and turn solid white when fully charged. See more on light sequencing below.
When charged fully, remove the cable and insert the protective silicone plug provided to prevent any moisture from entering the device.
* Avoid using third-party cables or charging through laptops and external devices, as these could lead to damage or battery degradation.
Module light colors and sequencing:
Red: The red LED light usually indicates low battery. You should fully charge your device.
Side-to-Side Yellow: Calibre is undergoing calibration. For proper calibration it should be placed on a stable surface and left undisturbed until calibration is complete and yellow light stops flashing.
Flashing White: The flashing white LED light means your Calibre is ready to connect to the phone app and has not yet made the connection.
Oscillating White: The slowly oscillating white LED light indicates your Calibre is charging.
Solid White: The solid white LED light indicates your Calibre is fully charged.
Flashing Yellow: The device is fully powered off. Must allow a 30 minute charge before next session to properly warm up the O2 sensor.
Battery Optimization:
Maximize your Calibre device's battery life by using the appropriate power mode depending on your usage habits
Sleep Mode
(More than once a day)
Use this mode when the device will be inactive for short periods (e.g., between sessions or throughout the day).
How to activate Sleep Mode:
• Press and hold the module button for 3 seconds
• Release when the light gradually fades out
Key Details:
• Sensors stay in a low-power “ready” state
• To wake: press the button once — the light will begin to blink, indicating readiness for pairing
Shut Down Mode
(Once a day or less)
Ideal for overnight or long-term storage (e.g., more than a day without use).
How to Shut Down the device:
• Press and hold the module button continuously for 10 seconds
• Yellow light will blink two times quickly – now powered off
Key Details:
• Device is fully powered off (no battery drain)
• Cannot be reactivated via the button — must be plugged in with the provided charger and a standard wall adapter
• Always allow a 30 minute charge before next session. Skipping this step may lead to inaccurate data.
Button Sensitivity Note
The module button is designed without a mechanical “click” to preserve fit and seal.
Tip: Center your finger and press firmly — you’ll quickly get used to the feel.
Battery Life Expectations
Sleep Mode: up to 36 hours
Shut Down: No battery drain
Baseline and Calibration:
To ensure precise and reliable readings, every session with Calibre should begin with two key steps: warming up the sensors (baseline) and calibrating the device.
Baseline: Warming the Sensors
Before starting any protocol, especially your first session or a longer test, it’s important to warm the sensors by performing a baseline procedure. Follow the steps below:
1. Begin by pressing and holding the module button for about 10 seconds. You’ll know it’s working when the yellow light flashes twice — this signals the start of the baseline process.
2. Let the device rest for one minute.
3. Even if the battery is already full, the next step is critical: place the device on the charger for a full 30 minutes. This isn’t just about battery level — it gives the oxygen sensor time to reach operating temperature, which is essential for accuracy. Skipping this step may lead to inaccurate data.
Calibration: Preparing for Accurate Measurements
Calibre is uniquely designed to calibrate using ambient room air, meaning there’s no need for specialty gases or equipment. To begin calibration, simply set the module on a stable surface in the same environment where you'll be testing. It doesn’t matter whether it’s inside the mask or on its own — what matters is that it remains untouched and free from airflow.
You should avoid breathing in the device for approximately 30 minutes before calibration. This allows the surrounding air to properly diffuse into the internal sensing chamber. Be sure the environment is free of drafts or direct fans to maintain stable conditions.
Once you’re ready to calibrate, open the app and connect your Calibre device. You’ll be prompted to calibrate — just follow the instructions. During calibration, a side-to-side yellow light will appear for about 10 seconds. When it stops, your device is fully calibrated and ready for accurate use.
Fit:
To ensure proper operation and comfort, position the face piece so it covers your mouth and rests gently just beneath your nostrils (without inserting your entire nose into the hole underneath).
It is very important to understand that Calibre is designed to sit softly against the face. Unlike most measuring devices that rely on a tight seal, Calibre should be held in place by the straps – gently,, but snug enough that it doesn’t fall away from the face. Avoid compressing the face piece too much, as it needs a sufficient interior volume to operate accurately.
Care/Cleaning:
Do not wash, rinse, or submerge the module, as this could damage the internal electronic components and void the warranty. However, the facepiece and other non-electronic parts are waterproof and washable.
You may clean the facepiece as often as needed, as long as the module is removed. Soap and detergent are safe to use—just be sure to rinse thoroughly and let it dry completely before reattaching the module.
To prevent water damage and ensure proper functioning, always insert one of the provided silicone plugs into the USB-C port before using your Calibre device. This plug acts as a barrier to safeguard the internal electronics from moisture.
Wipe any excess moisture from the outside of the module before charging, and ensure the module is dry before connecting it to a power source.
Protocols:
The team at Calibre has worked with experts in the field to create, test and validate protocols that create accurate data with our device. Due to the nature of how Calibre collects data it is strongly recommended all users follow the protocols exactly as described as they may vary from other recognized protocols.
See Protocol PageExporting Your Data:
Export your session as CSV files through your personal web-based portal:
1. Go to the web portal at https://portal.calibrebio.com
2. Log in with your Calibre app credentials.
3. Select the download button next to the session or open the session and select “Download CSV”.