Elevation guide
How to measure elevation gain on a route (for running and cycling)
Distance only tells you half the story of a run or ride. The other half is the hills — how much climbing is packed into those kilometres. This guide shows you how to trace a route, read its total ascent and descent, and understand what those numbers actually mean for your legs.
What you'll need
Just a browser and a rough idea of where your route goes. Map Measurer runs on any phone, tablet or computer, with no account and nothing to install. If you can picture the path on a map — a loop from your front door, a trail you're eyeing, a sportive you've entered — you have everything you need to estimate its climbing before you set off.
Step by step
- Open the map measuring tool and select the Elevation tool in the toolbar.
- Find your start. Use the search box to jump to a place, address or postcode, or drag and zoom the map until your starting point is in view.
- Click points to trace the route. Tap the start, then keep clicking along the path — every bend, junction and turn. Each click adds a segment, so the more carefully you follow the road or trail, the truer the climb you'll get.
- Finish at your end point (click back on the start if it's a loop). When the line follows your real route, press Get profile.
- Read the results. The tool shows total ascent ↑, total descent ↓, the maximum elevation reached, and an elevation chart plotting height against distance along the way.
If you misplace a point, use Undo to drop the last one, or Clear to start the route over. Switch the readout between metres and feet whenever you like — every figure updates instantly.
Tip: click more points on the hilly parts. Denser spacing samples the terrain more often, so steep climbs and sharp dips are captured more faithfully. A few clicks across a flat stretch is plenty; a winding mountain switchback deserves a click per bend.
Worked example: a hilly 10 km loop
Imagine a 10 km loop from home that climbs out over a ridge and drops back the other way. You trace it carefully, clicking through every turn, then press Get profile. The readout might show about ↑ 320 m of ascent and ↓ 320 m of descent, with a maximum elevation reached partway round where the route crests the ridge. The ascent and descent land close together because you finished where you began — what goes up over the loop must come back down.
The chart makes the shape obvious: a long pull up to that high point, a plateau along the top, then a descent home. That's far more telling than the bare "10 km". These figures are clearly illustrative — your own loop will differ — but they show the pattern you'll see.
What the numbers mean
Three figures do most of the work:
- Total ascent (elevation gain). Every uphill section added together. This is the number runners and cyclists care about most — it's the climbing your legs actually do.
- Total descent. Every downhill section added together. On a loop back to the start it roughly matches the ascent; on a point-to-point route the two can be very different.
- Net change. The difference between where you finish and where you start. A route can have a tiny net change but a huge total ascent if it rolls up and down repeatedly — and those rolls are real work, which is exactly why gain, not net, is the figure that matters.
Why does this matter so much? Because elevation gain predicts effort far better than distance alone. A flat 10 km and a hilly 10 km are completely different days out. Knowing the climbing in advance lets you pace a race sensibly, choose a flatter route when you want an easy one, or judge honestly whether a walk is within someone's reach.
Limitations and accuracy
It helps to know how this number is produced, because it shapes how much to trust it. Map Measurer samples points evenly along the line you traced, looks up the ground height of each from a global terrain dataset — a digital elevation model — and adds up the ups and downs. That gives a faithful guide to the hills, but it has honest limits:
- It's a model, not a measurement. The heights come from a terrain dataset, not a barometric altimeter or a survey of the ground under your feet. Small bumps get smoothed and very fine detail is lost.
- Point spacing changes the figure. Denser clicks sample more of the route and catch more of its real undulation. A sparsely traced route can under-count the climbing.
- It follows the ground. The model knows the terrain, not the infrastructure on top of it, so it doesn't account for bridges, tunnels or overpasses — it reads the height of the land beneath them.
- A GPS watch may disagree. Your watch records as you move, with its own sampling and a dose of sensor noise, so it can report a different total for the same route. Neither is wrong; they're two estimates of the same hills.
Treat the result as a reliable guide to how hilly a route is, not a certified figure to the metre. For more on where map figures can drift, see how accurate online map measurements really are.
Measure your route's climb now →
FAQ
What is elevation gain on a route?
Elevation gain, also called total ascent, is the sum of all the uphill sections along your route added together. Total descent is the sum of all the downhill sections. On a loop that returns to where you started, total ascent and total descent come out roughly equal.
Why does my GPS watch show a different elevation gain?
A watch records its own readings as you move, with its own sampling rate and a bit of noise, so it often lands on a different total. Map Measurer instead samples points along your traced line and reads the ground height of each from a terrain model. Both are reasonable estimates of the same hills, not a single certified number.
Can I switch between metres and feet?
Yes. The elevation readout and profile chart switch between metres and feet with the unit toggle, and every figure updates instantly.