Start with a transparent estimate
Hiking time · calculator
Ten kilometres on an easy track and ten kilometres with 800 metres of climbing are not the same day out. Planning from distance alone can leave you badly short of time. Treating a calculator result as a guaranteed arrival time can be just as misleading.
This calculator has a narrower purpose: it gives you a planning estimate that you can understand, adjust and compare with your actual pace. It is a starting point, not a promise and not a judgement about whether a route is safe.
Start with a transparent estimateDistance (km)Total ascent (m)Method4 km/h + 1 minute per 10 m ascentClassic variant: 5 km/h + 1 hour per 600 m ascentMy base pace + 1 minute per 10 m ascentYour base pace (km/h)Planned breaks and other known additions (minutes)Calculatefunction round5(n){return Math.round(n/5)*5}function fmt(min){const m=round5(min),h=Math.floor(m/60),r=m%60;return h?`${h} hr${r?` ${r} min`:``}`:`${r} min`}function calculateHike(){const d=Number(document.getElementById('distance').value),a=Number(document.getElementById('ascent').value),b=Number(document.getElementById('breaks').value),model=document.getElementById('model').value,custom=Number(document.getElementById('speed').value),out=document.getElementById('result');if(!Number.isFinite(d)||!Number.isFinite(a)||!Number.isFinite(b)||d<0||a<0||b<0||(model==='custom'&&(!Number.isFinite(custom)||custom<=0))){out.innerHTML='<p><strong>Check the inputs.';return}let speed=4,ascentMinutes=a/10,label='4 km/h + 1 minute per 10 m ascent';if(model==='classic5'){speed=5;ascentMinutes=a/10;label='5 km/h + 1 hour per 600 m ascent'}else if(model==='custom'){speed=custom;label=`Your pace ${custom.toFixed(1)} km/h + 1 minute per 10 m ascent`}const horizontal=d/speed*60,total=horizontal+ascentMinutes+b;out.innerHTML=`<h3>Estimated: ${fmt(total)}<p><strong>Method: ${label}<p>Distance: ${fmt(horizontal)} · ascent: ${fmt(ascentMinutes)} · breaks/additions: ${fmt(b)}<p><strong>Compare the result with conditions, daylight and the group's pace.`}calculateHike();The result is rounded to five minutes because greater precision would be misleading.Mountaineering Scotland uses a practical navigation-planning baseline of 4 km/h on the flat plus 1 minute for every 10 metres of ascent. Its guidance also notes that real walking speed varies with fitness, pack weight, journey length, wind, underfoot conditions and slope.The useful part of the calculation is seeing its components rather than receiving one unexplained number. Add planned breaks separately. If you already know that your group normally walks more slowly than 4 km/h, use a more realistic base pace instead of pretending the formula knows your group.
Example: 10 km with 600 m of ascentDistance, ascent and planned breaks remain separate. The total is a planning estimate, not a guaranteed arrival time.At a base pace of 4 km/h, the horizontal part takes 2 hours 30 minutes. Six hundred metres of ascent adds another 60 minutes under this model. The planning estimate is therefore 3 hours 30 minutes before breaks and other delays.If you expect two 15-minute breaks, add another 30 minutes explicitly. This makes it clear which part comes from the model and which part comes from your own plan.That still does not mean your group will arrive in exactly four hours. A wet or rough path, strong wind, snow, a navigation error, fatigue or a heavy pack can change the pace substantially.
Do not silently mix different Naismith variantsDifferent versions of Naismith-style timing are in common use. If a calculator offers more than one, it should tell you clearly which model you have selected. Different base speeds and ascent allowances should not be averaged invisibly into one result.On this page, the Mountaineering Scotland teaching baseline — 4 km/h plus 1 minute for every 10 metres climbed — is kept explicit. The classic comparison is labelled as a separate model rather than being blended into the default estimate.
When your own pace is more usefulIf you have records from previous walks on similar terrain, your own sustainable pace is usually more informative than a generic “average hiker” value. Use it as the base and keep ascent, breaks and conditions visible as separate factors.If you do not yet have that history, start conservatively. The goal is not to prove that a route fits a schedule you have already chosen. The goal is to create an estimate that you can compare with real progress once you are moving.
Recheck the plan during the hikeMountaineering Scotland recommends thinking about decision points and alternatives when planning a route, not only the ideal line. Decide in advance where you could shorten the day or switch to another option if the group is slower than expected or conditions deteriorate.If you reach one of those points much later than the estimate, that is useful new information. Reassess the remaining distance, daylight, weather, the condition of the group and your alternatives. Do not simply speed up because a calculator predicted a shorter time.
What this estimate cannot knowA calculator does not know the current forecast, snow or ice, trail condition, river levels, technical difficulty, the health of the people in your group, navigation mistakes or how much daylight remains. Those factors need separate checks and judgement.Even in navigation, timing is only one clue. Mountaineering Scotland’s guidance on recovering when navigation goes wrong combines timing with terrain observations, map information, direction and other evidence rather than relying on one number.
A practical way to use the resultStart with the transparent distance-and-ascent calculation.Add time deliberately for breaks and the needs of your group.Choose a point on the route where you will compare the estimate with actual progress and decide whether to continue.Used this way, the calculator remains what it should be: a planning aid. The real route decision still depends on conditions, terrain, navigation and the people who are there.Before you set off: check the estimate against the forecast, daylight, route condition, technical difficulty, the experience and fitness of the group, and realistic alternatives if progress is slower than expected. If the numbers only work when everything goes perfectly, the plan needs more margin rather than a faster assumed pace.
SourcesMountaineering Scotland — Planning and following a routeMountaineering Scotland — Planning your routeMountaineering Scotland — When navigation goes wrongOrdnance Survey — Naismith's RuleChecked September 7, 2026. This is a planning estimate, not a guaranteed arrival time or safety assessment.
