Estimate how long a hike will actually take using distance, elevation gain and loss, terrain, your pack weight, fitness, and planned breaks. This tool uses a Naismith-style rule of thumb, transparently adjusted, and gives you a realistic time range rather than one falsely precise number — plus an optional turnaround-time planner if you tell it your sunset time.
Your hike details
0.0–0.0 hours
Moving time plus breaks, shown as a range rather than one exact number.
What's driving your time
Turnaround & start-time planning
Add a sunset time above to get a suggested turnaround time and recommended start time.
Suggested turnaround time: —
Recommended start time: —
Rough planning aid only — it assumes your return trip takes about as long as your outbound trip, which may not hold if the elevation profile reverses substantially (e.g. climbing most of the way out).
This is a moving-time estimate, not a guarantee
Weather, navigation mistakes, river crossings, injury, heat, altitude, and darkness can all substantially change how long a hike actually takes. Always carry navigation tools you know how to use, tell someone your planned route and expected return time, and build in a safety margin beyond this estimate.
Illustrative only — the marker shows roughly where your total estimated trail time falls on a 0–12 hour scale, not a live position on the trail.
Why this estimate may vary
Trail conditions can differ day to day (mud, snow, blowdown, recent trail work), a group's real pace is usually set by its slowest member rather than an average, snack and photo stops beyond your planned break time add up fast, and your actual fitness on trip day may not match the pace category you selected. Treat this as a planning range, not a stopwatch.
How this estimate is calculated
This calculator starts with a Naismith-style rule of thumb: base moving time is your distance divided by a pace that matches your chosen fitness level (2–3.5 mph), plus roughly 30 minutes of extra time for every 1,000 ft of elevation gain and a smaller addition for elevation loss. That combined time is then scaled up for terrain difficulty, trail altitude, and group composition (hiking with children or a dog typically slows a group down more than an extra adult does). Pack weight adds its own gradual penalty — little to no slowdown under about 15 lb, ramping up to roughly 35% slower at 75+ lb — so if you're unsure how heavy your load really is, our Backpack Weight Calculator can help you sanity-check it before you head out. Break time is added on top of moving time, and the whole total is presented as a range (90% to 115% of the calculated total) because delays are far more common on trail than finishing early.
Assumptions & limitations
- Pace categories (relaxed, average, strong, very fast) are rough bands, not a precise measurement of your fitness.
- The elevation-gain and elevation-loss additions are simplified averages — very steep or very gradual grades can add or subtract this much.
- Terrain, altitude, pack weight, and group multipliers are estimates based on common trip-report patterns, not a scientific model.
- This tool does not know your specific trail's conditions, weather forecast, water crossings, or route-finding difficulty.
- Turnaround and start-time suggestions assume a similar-paced return trip, which is often, but not always, a fair assumption.
- This is a planning estimate only — see our full disclaimer for what this tool is and isn't meant to do.
Practical recommendations
Plan around the high end of your estimated range, not the low end, especially for hikes with real elevation gain, an unfamiliar trail, or a group that includes kids or a dog. Always tell someone your route and expected return time before you go, carry a paper map or offline GPS track as backup, and pack a headlamp even for day hikes that "shouldn't" run into darkness — turnaround times are a guide, not a guarantee. If your day hike might stretch into an overnight because of a late start or slower-than-expected pace, our Sleeping Bag Temperature Calculator can help you figure out if you're carrying enough warmth just in case.
Frequently asked questions
How does elevation gain affect hiking time?
Climbing is much slower than walking on flat ground. This calculator adds roughly 30 minutes of extra time for every 1,000 ft of elevation gain (and a smaller amount for elevation loss), on top of your base distance time — so two hikes of the same length can take very different amounts of time depending on how much climbing is involved.
What is Naismith's rule?
Naismith's rule is a classic mountaineering rule of thumb from the 1890s: allow about one hour for every 3 miles (5 km) of distance, plus extra time for climbing. This calculator uses that same basic idea but adjusts pace, terrain, pack weight, altitude, and group composition transparently rather than using a single fixed rate.
Does pack weight really slow you down that much?
Yes, especially past a certain point. This calculator applies little to no slowdown for a light daypack (under about 15 lb), then ramps up gradually to roughly 35% slower moving time at 75+ lb, which matches how noticeably a heavy overnight or multi-day pack can affect pace on trail.
How much should I add for altitude?
This calculator adds about 8% more time at moderate altitude (roughly 5,000–9,000 ft) and about 20% more time at high altitude (above roughly 9,000 ft), since thinner air makes sustained effort harder even for fit, acclimatized hikers. If you're not acclimatized, actual slowdowns can be larger than this estimate.
What's a safe turnaround time strategy?
A common rule is to pick a firm turnaround time before you start, based on your slowest planned pace and a comfortable daylight buffer, and stick to it regardless of how far you've gotten — not just once you "feel tired." This calculator's turnaround suggestion assumes your return leg takes about as long as your outbound leg, so build in extra margin if your route climbs more on the way out than on the way back.
Should I enter one-way or round-trip distance?
Enter whatever distance you'll actually be moving for that trip. For an out-and-back hike, use the full round-trip mileage and round-trip elevation gain/loss; for a point-to-point or one-way hike, use just the one-way numbers.
How accurate is this hiking time calculator?
It's a planning estimate based on a widely used rule of thumb, not a measurement of your specific trail or fitness on the day. Use the range it gives you as a starting point, and adjust based on your own past experience on similar trails.
Why is my estimate shown as a range instead of one number?
Because a single number would be falsely precise. Real hikes are affected by too many variables — weather, footing, how you're feeling that day — to pin down to the minute, and delays are more common than finishing early, so the range is intentionally wider on the high end.
How much does hiking with kids change the estimate?
This calculator applies a larger slowdown for children present than for an extra adult or a dog, since young kids typically set a much slower group pace, need more frequent stops, and can tire unevenly through the day. Build in extra break time on top of this estimate for family hikes.
Does elevation loss slow you down too?
Yes, though less than elevation gain. Steep descents are easier aerobically but harder on knees, ankles, and footing, especially with a loaded pack, so this calculator adds a smaller (but nonzero) time penalty for elevation loss on top of elevation gain.
What if part of my hike has no cell service?
Plan as if it doesn't, even if you expect some bars — carry a paper map or downloaded offline GPS track, and don't rely on this calculator (or your phone) as your only source of timing or location information once you're on trail.
How do I use the sunset and turnaround-time fields?
Enter your local sunset time and, if you know it, your planned start time. The calculator subtracts your daylight safety buffer from sunset to find your latest safe return time, then works backward to suggest a turnaround time and a recommended start time — treat both as a rough guide, not a guarantee.