Endurometry
The Venu 3 is Garmin’s health and lifestyle watch, but on paper its battery is competitive with the running flagships: 14 days of smartwatch use and 26 hours of GPS from the 45 mm model.
The difference is what you give up. There is no multi-band GPS, no maps and no open-water navigation — the hardware budget went into the health stack instead.
Battery life compared
| Mode | Forerunner 265 | Forerunner 965 | fēnix 8 | Venu 3 This watch |
|---|---|---|---|---|
| Smartwatch mode | 13 days | 23 days | 16 days always-on 7 days | 14 days always-on 5 days |
| Battery saver mode | — | — | 23 days | 26 days |
| GPS-only | 20 hours | 31 hours | 47 hours always-on 37 hours | 26 hours |
| SatIQ / AutoSelect | 16 hours | 22 hours | 38 hours always-on 30 hours | — |
| All systems + multi-band | 14 hours | 19 hours | 35 hours always-on 28 hours | — |
| GPS + music | 7 hours | 10.5 hours | 10 hours | 11 hours |
| Max battery GPS | — | 34 hours | 81 hours | — |
| Expedition GPS | — | — | 17 days | — |
Official Garmin figures, gesture-activated display unless noted. Real battery life depends on the features you have enabled — GPS mode, music, Pulse Ox and always-on display all cost hours.
“—” means Garmin does not publish that figure separately for this watch. We leave it blank rather than estimate.
Specs
| Size | 45 mm |
| Display | 1.4″ AMOLED |
| Storage | 8 GB |
| Positioning | GPS / GLONASS / Galileo |
| Released | 2023 |
Is it the right watch for your running?
The lifestyle pick. It matches the running watches on smartwatch endurance and beats the Forerunner 265 on GPS hours, but it has no multi-band GPS and no maps — so it is a health tracker that runs well, not a race watch.
Buy it if the health metrics — Body Battery, sleep score, HRV status, nap detection — matter more to you than race features, and you still want to record runs properly. Pick a Forerunner if you care about pace accuracy in cities or need maps.
Related Tools
Training Pace Calculator (VDOT Zones)
Get your VDOT from a recent race and see easy, marathon, threshold, interval and repetition pace zones plus heart-rate zones.
Heart Rate Zone Calculator
Calculate your five running heart-rate zones from age, resting heart rate and max heart rate using the Karvonen method.
Running Pace Calculator
Enter distance and finish time to get your pace per km and mile, average speed and per-kilometre splits.
Frequently Asked Questions
How long does the Venu 3 battery last in GPS mode?
Up to 26 hours in GPS-only mode for the 45 mm model, per Garmin. In all-systems GNSS mode it is about 20 hours, and about 11 hours with music playback.
Does the Venu 3 have the same health metrics as the Forerunner?
Yes — Body Battery, sleep score and insights, HRV status, all-day stress, nap detection and the breathing variations feature are all present.
How long does it last with the always-on display?
About 5 days, according to Garmin, versus 14 days with the gesture-activated display.
Related Tools
Running Pace Calculator
Enter distance and finish time to get your pace per km and mile, average speed and per-kilometre splits.
Running Pace Converter
Convert between min/km, min/mi, km/h and mph, and see the implied finish time for 5K, 10K, half marathon and marathon.
KPH to MPH Converter (km/h to mph)
Convert kph to mph instantly: mph = km/h × 0.621371, so 100 km/h = 62.14 mph. Free km/h to miles per hour chart for road and running speeds, plus mph to km/h.
Race Time Predictor
Predict your finish time at any distance using the Riegel power law and the Daniels–Gilbert VO2max model.
Training Pace Calculator (VDOT Zones)
Get your VDOT from a recent race and see easy, marathon, threshold, interval and repetition pace zones plus heart-rate zones.
Age Grading Calculator
Convert a finish time to an approximate open-class (20–29) equivalent using Endurometry age factors — not official WMA tables.
Want a new tool or fix?
Tell us which calculator, pace chart or fix would help — we build what runners ask for. Replies usually come back in 1–2 days.