Hiking Time Estimator

Naismith's rule, published by Scottish mountaineer William Naismith in 1892, estimates hiking time as one hour for every 3 miles (5 km) of distance plus one extra hour for every 2,000 feet (600 m) of ascent. This page is a Naismith rule calculator (also written naismiths rule calculator) using the widely quoted metric form: 12 minutes per kilometre plus 30 minutes for every 300 metres climbed. It is a planning estimate, not a guarantee — weather, trail condition, pack weight and fitness all change real-world times.

For a fit walker on a good path, Naismith's rule is typically within 20-30% of actual moving time. It tends to underestimate on rough terrain, in bad weather, with heavy packs, or for less fit hikers, and it ignores descents entirely. That is why this calculator shows four formulas side by side — Naismith, Langmuir, Tobler and Tranter — so you can see the range of estimates instead of trusting a single number.

Enter your route distance and total ascent in this hiking time calculator with elevation gain. The classic Naismith calculation is 12 minutes per kilometre plus 30 minutes per 300 metres of ascent — for example, 10 km with 800 m of climbing gives 120 + 80 = 200 minutes (3 h 20 min) of moving time. Add your planned breaks on top. Our calculator does this instantly and also applies the Langmuir descent correction and Tobler's function for comparison.

Naismith's rule ignores descents, but downhill takes real time. Langmuir's correction adjusts the Naismith estimate for descent: subtract 10 minutes for every 300 m of gentle descent (slopes of 5-12 degrees) and add 10 minutes for every 300 m of steep descent (over 12 degrees), because steep downhills are slow and hard on knees. Select your descent steepness in the calculator to apply it.

Tobler's hiking function is an empirical formula from Swiss geographer Waldo Tobler: walking speed W = 6 x e^(-3.5 x |s + 0.05|) km/h, where s is the path gradient (rise over run). It predicts maximum speed of 6 km/h on a gentle -5% downhill, about 5 km/h on flat ground, and slower speeds on steep climbs and descents. Unlike Naismith it handles descents natively, but it uses the net gradient, so it is most accurate for single-direction legs — use segment mode for out-and-back routes.

Tranter's corrections adjust Naismith's estimate for fitness level: super-fit hikers subtract one third, fit hikers subtract one quarter, reasonably fit hikers subtract one eighth, average hikers use the unadjusted time, and unfit hikers add one half. In the calculator, choose your fitness level and the Naismith estimate is scaled accordingly — for example, 200 minutes becomes 150 minutes for a fit hiker or 300 minutes for an unfit one.

On flat ground, Naismith's rule gives 5 miles about 1 hour 40 minutes (5 / 3 hours). With 1,000 feet of ascent, add 30 minutes for a total of about 2 hours 10 minutes moving time — then add breaks. A typical average hiker walks 2-3 mph on trails, so most 5-mile day hikes take 2-4 hours door to door including rests. Enter your exact distance and elevation in the calculator for a precise estimate.

Naismith's rule assumes 3 mph (20 minutes per mile, 12 minutes per kilometre) on flat, good trail. In practice, an average hiking pace per mile is 20-30 minutes (2-3 mph) on moderate trails, beginners run 30-40 min/mi, and fit hikers hold 15-20 min/mi on easy ground. A good hiking pace per km for most day hikers is 12-18 min/km. Steep climbing often drops pace to 1-1.5 mph. Use the fitness calibration in the calculator rather than guessing — it applies Tranter's published corrections.

Yes — always. Formulas estimate moving time only. A common planning guideline is 10 minutes of rest per hour of moving time, plus longer stops for lunch and viewpoints. Our break planner adds your chosen rest rate automatically: for example, 4 hours of moving time at 10 minutes per hour becomes 4 h 40 min total. On long or hot days, plan more.

Turn-back time (turnaround time) is the latest clock time at which you must start heading back to reach your endpoint safely — usually before dark. The calculator above doubles as a turn back time calculator hiking planner: enter your start time, must-return-by time and safety margin, and it returns turn-back = start + (available time - safety margin) / 2 for out-and-back routes. Reaching the summit is optional; getting back is mandatory.

Switch to segment mode and add one row per leg of your route, each with its own distance, ascent and descent — for example, approach, climb, ridge traverse and descent. The calculator estimates every segment with all four formulas and sums the totals, so steep legs are not averaged away. This is far more accurate than entering whole-trip totals, especially for routes where the gradient changes a lot.

Yes. Toggle between metric (kilometres, metres) and imperial (miles, feet) at the top of the calculator. All four formulas are computed in metric internally after converting your inputs, so results are identical in both systems — for example, 10 km with 800 m of ascent and 6.2 miles with 2,625 feet of ascent both give a 3 h 20 min Naismith estimate.

Neither is universally better. Naismith's rule is simpler, widely taught, and easy to sanity-check by hand; its weakness is ignoring descents. Tobler's function handles descents and gradient continuously but needs the net gradient, so it underestimates rolling out-and-back terrain when given whole-trip totals. Our calculator shows both plus Langmuir and Tranter side by side with an agreement summary — when all four agree within 15-20%, you can trust the estimate; when they diverge, plan conservatively.

Not directly — running and hiking are different intents with different energetics. These formulas are calibrated for walking speeds (up to about 6 km/h). For running pace predictions, Riegel, Cameron and VDOT models, use our running-pace-predictor tool instead, which is built specifically for runners.

No. Every estimate on this page is a planning aid, not a guarantee and not a substitute for judgment. Real times vary with weather, trail surface, navigation errors, pack weight, altitude, group size and how you feel that day. Always carry the ten essentials, check the forecast, tell someone your plan, and turn back at your turn-back time even if the summit is close. When in doubt, plan for the slowest estimate shown.

Beginners should use the 'unfit' fitness setting (Tranter adds 50%), add generous breaks (15 minutes per hour), and plan for the slowest of the four formula estimates — then add a safety margin on top. Choose a route well within your limits, start early, and set a firm turn-back time. Your first few hikes will calibrate your personal pace; after that, the custom flat-pace calibration gives the most personal estimates.