Wearable Data Storage Calculator

Estimate on-device and cloud storage requirements for wearable health data based on sensor configuration, sampling rates, compression, and retention period.

Inputs

Accelerometer rate (Hz)

Heart rate mode

GPS fix rate (Hz)

GPS hours per day

SpO2 monitoring

ECG recording

ECG minutes per day

Gyroscope

Data retention (days)

Number of devices

Compression ratio

Tab to move between fields

Results

Compressed per day (MB)

8.69

Total storage per device (GB)

3.1

Raw data per day (MB)26.07

Compressed per month (GB)0.26

Total all devices (GB)3.1

Est. cloud cost ($/month)$0.07

Monthly data transfer (GB)0.26

Data points per day4,334,160

How to Use This Calculator

Set the accelerometer sampling rate (Hz) and heart rate monitoring mode for your wearable.
Select GPS fix rate and enter average daily GPS hours (workout duration).
Enable SpO2, ECG, and gyroscope sensors that your device records.
Enter data retention period (days), number of devices (fleet), and compression ratio.
Review raw and compressed data per day (MB), monthly cloud storage (GB), and estimated cloud cost.

How the result changes with Compression ratio

Compression ratio	Compressed per day (MB)	Total storage per device (GB)
1.9	13.72	4.89
4.15	6.28	2.24
6.85	3.81	1.36
9.1	2.86	1.02

What each input means

Accelerometer rate (Hz): Accelerometer sampling rate. Consumer wearables: 25-100 Hz.
Heart rate mode: Select the heart rate mode
GPS fix rate (Hz): Select the gps fix rate (hz)
GPS hours per day: Average hours per day GPS is actively tracking (workouts, commute).
SpO2 monitoring: Select the spo2 monitoring
ECG recording: Select the ecg recording
ECG minutes per day: Minutes of ECG recording per day (single-lead at 250 Hz).
Gyroscope: Select the gyroscope
Data retention (days): How many days of data to keep in cloud storage.
Number of devices: For fleet/enterprise: number of wearable devices generating data.
Compression ratio: Data compression factor. Typical time-series: 2-4x with LZ4/zstd.

What each result means

Raw data per day (MB): Uncompressed data generated per device per day.
Compressed per day (MB): Compressed data per device per day.
Compressed per month (GB): Compressed data per device per month.
Total storage per device (GB): Total compressed storage needed per device for the retention period.
Total all devices (GB): Total storage across all devices for the retention period.
Est. cloud cost ($/month): Estimated cloud storage cost at ~$0.023/GB/month (S3 standard).
Monthly data transfer (GB): Data transferred from devices to cloud per month.
Data points per day: Total number of individual sensor readings per device per day.

How this is calculated

Worked example, using the default values

Identify Input Parameters
4 parameters
Accelerometer rate (Hz) = 50, Heart rate mode = 1, GPS fix rate (Hz) = 1, GPS hours per day = 1 = 11 input(s) provided
Calculate Compressed per day
Compressed per day = compressedBytesPerDay / (1024 * 1024)
8.69 = 8.69
Calculate Total storage per device
Total storage per device = (compressedBytesPerDay * retentionDays) / (1024 * 1024 * 1024)
3.097 = 3.097
Calculate Raw data per day
Raw data per day = totalRawBytesPerDay / (1024 * 1024)
26.07 = 26.07
Calculate Compressed per month
Compressed per month = compressedMbPerDay * 30.44 / 1024
0.258 = 0.258