Drop in a GPX file to see its distance, climb, walking time, elevation profile and which hills it goes over. Your file is read on your device. Nothing is uploaded.
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Tracks and routes from any app or website: OS Maps, Komoot, Strava, AllTrails, your watch and more.
Stays on your device
Reading your file
Your Route
Elevation Profile
Move or tap along the chart to follow the route on the map.
Hills On This Route
Every Ethel, Wainwright, Munro, Sylvia and Pennant whose summit is within 100 m of your track.
How It Works
- Distance
- We add up the straight-line distance between each pair of points in your file, measured over the curve of the Earth (the haversine formula). Gaps between separate track segments are not counted.
- Ascent and descent
- GPS heights jitter up and down, which makes a raw total far too high. We resample the route every 10 m, smooth the heights over about 30 m, and only count a climb or drop once it is more than 2 m. Apps all do this a little differently, so expect small differences.
- Heights
- If your file has heights, we use them. If it does not, we look each point up in Mapbox Terrain-RGB elevation tiles in your browser. The page tells you which was used.
- Walking time
- Naismith's rule: 1 hour for every 5 km (3 miles) walked, plus 1 hour for every 600 m of ascent, as set out by Ordnance Survey. It does not include stops, and it is only a starting point. Your pace, the weather and the ground all change it.
- Loop or one way
- If the finish is within 250 m of the start, we call it a loop. Otherwise it is one way.
- Grid reference
- GPX files use WGS84 latitude and longitude. We convert the start point to the OSGB36 National Grid using the Ordnance Survey Helmert transformation and Transverse Mercator projection. OS says this is accurate to about 3.5 m, which is fine for a 6-figure grid reference. Points outside Great Britain have no National Grid reference.
- Hills on this route
- We measure the shortest distance from each summit on our five lists to the line of your track, including the stretches between its points. If it is 100 m or less, the hill is listed, in the order you reach it. Summit positions and heights are from the Database of British and Irish Hills.
A GPX file is not a safety check. Always carry a paper map and compass, check the mountain forecast, and know how you would get off the hill early.
Sources
- Ordnance Survey: Why we're adjusting Naismith's Rule (Naismith's rule)
- Ordnance Survey: Approximate WGS84 to OSGB36/ODN transformation (Helmert parameters and accuracy)
- Ordnance Survey: Helmert datum transformations
- Ordnance Survey: A Guide to Coordinate Systems in Great Britain (PDF) (National Grid projection)
- Mapbox: Access elevation data (Terrain-RGB heights)
- Database of British and Irish Hills (hill positions and heights)
- Map data © Mapbox © OpenStreetMap contributors