Device research record
Garmin Forerunner 245
Signals and sensors
From the device record. Fields the source does not state are left out.
- Maker
- Garmin
- Form factor
- Wrist
- Series
- Forerunner 245
- Family
- Garmin smartwatch
- Signals recorded
- PPG, Accelerometer
- Also called
- Forerunner 245
What published studies show
Results quoted from 2 published validation studies, each against a clinical reference. A result applies to the model and protocol tested, not to every model the brand sells. From the wearable accuracy database (v1.0.0).
Overnight heart rate1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Garmin Forerunner 245 Music | ICC 0.41Intraclass correlation | ECG | n = 53, Overnight, sleep laboratory | Miller et al. (2022)Other maker funded |
| Garmin Forerunner 245 Music | 5.4 bpm (absolute bias)Mean absolute error | ECG | n = 53, Overnight, sleep laboratory | Miller et al. (2022)Other maker funded |
- Garmin Forerunner 245 MusicICC 0.41
Intraclass correlation · vs ECG · n = 53, Overnight, sleep laboratory
Miller et al. (2022) Other maker funded
- Garmin Forerunner 245 Music5.4 bpm (absolute bias)
Mean absolute error · vs ECG · n = 53, Overnight, sleep laboratory
Miller et al. (2022) Other maker funded
HRV (RMSSD)1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Garmin Forerunner 245 Music | ICC 0.24Intraclass correlation | ECG | n = 53, Overnight, sleep laboratory | Miller et al. (2022)Other maker funded |
| Garmin Forerunner 245 Music | 33.1 ms (absolute bias)Mean absolute error (absolute bias) | ECG | n = 53, Overnight, sleep laboratory | Miller et al. (2022)Other maker funded |
- Garmin Forerunner 245 MusicICC 0.24
Intraclass correlation · vs ECG · n = 53, Overnight, sleep laboratory
Miller et al. (2022) Other maker funded
- Garmin Forerunner 245 Music33.1 ms (absolute bias)
Mean absolute error (absolute bias) · vs ECG · n = 53, Overnight, sleep laboratory
Miller et al. (2022) Other maker funded
Sleep stages (4-stage)1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Garmin Forerunner 245 Music | 50%Epoch-by-epoch agreement | Polysomnography (PSG) | n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together | Miller et al. (2022)Other maker funded |
| Garmin Forerunner 245 Music | κ = 0.25Cohen's kappa | Polysomnography (PSG) | n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together | Miller et al. (2022)Other maker funded |
Epoch-by-epoch agreement · vs Polysomnography (PSG) · n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together
Miller et al. (2022) Other maker funded
- Garmin Forerunner 245 Musicκ = 0.25
Cohen's kappa · vs Polysomnography (PSG) · n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together
Miller et al. (2022) Other maker funded
Sleep vs wake (2-stage)1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Garmin Forerunner 245 Music | 89%Epoch-by-epoch agreement | Polysomnography (PSG) | n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together | Miller et al. (2022)Other maker funded |
| Garmin Forerunner 245 Music | κ = 0.35Cohen's kappa | Polysomnography (PSG) | n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together | Miller et al. (2022)Other maker funded |
Epoch-by-epoch agreement · vs Polysomnography (PSG) · n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together
Miller et al. (2022) Other maker funded
- Garmin Forerunner 245 Musicκ = 0.35
Cohen's kappa · vs Polysomnography (PSG) · n = 53, Sleep laboratory, 1 night, 9 h in bed, all devices worn together
Miller et al. (2022) Other maker funded
VO2max estimate1 study
| Device tested | Result | Reference | Sample | Study |
|---|---|---|---|---|
| Garmin Forerunner 245 | 7.9% / 7.2% (two runs)Mean absolute percentage error | Indirect calorimetry | n = 35, Treadmill ramp test | Engel et al. (2026)Funding not reported |
- Garmin Forerunner 2457.9% / 7.2% (two runs)
Mean absolute percentage error · vs Indirect calorimetry · n = 35, Treadmill ramp test
Engel et al. (2026) Funding not reported
Comparisons
Head-to-head pages that name Garmin Forerunner 245 come first, then other comparisons for the brand.
- Garmin vs Apple Watch: PPG, ECG & Battery ComparedMentions Garmin Forerunner 245
- Polar vs Garmin: PPG Sensor Accuracy for AthletesMentions Garmin Forerunner 245
- WHOOP vs Garmin: PPG-Based Recovery and Training AnalyticsMentions Garmin Forerunner 245
- Amazfit vs Garmin: Budget vs Premium PPG Sensor TechnologyMentions Garmin Forerunner 245
- COROS vs Garmin: PPG Sensor and Training Platform ComparedMentions Garmin Forerunner 245
- Samsung Galaxy Watch vs Garmin: Sensors ComparedMentions Garmin Forerunner 245
- Apple Watch Ultra 2 vs Garmin Fenix 8: Specs Guide
- Forerunner 965 vs Fenix 8: Battery, Water Rating and ECG
- Fitbit vs Garmin: Heart Rate Accuracy Compared
- Suunto vs Garmin: PPG Sensor Accuracy for Outdoor Athletes