Four circles are on the map already, centred on 51.0501, -114.0853. That’s where GeoNames puts Calgary, close enough to the middle of town for most of what people bring here. The rings step out at 5, 10, 25 and 50 kilometres. Every figure in the tables below was measured from that one point, so if your centre belongs somewhere else, drag it and read the map instead of the table.
Be ready for a thin table. GeoNames lists settlements from 15,000 people upward and nothing below, which around Calgary leaves 4 inside the whole 50 km circle. That’s a fact about the dataset as much as about Alberta. Plenty of real suburbs and towns are out there. They just don’t clear the bar, or they get recorded as part of the city instead of as places in their own right.
The inner circle has no GeoNames name anywhere on it, which tells you something about how Calgary is built. At the other end, Okotoks is 36.4 km out to the south, near enough the edge of the 50 km ring. Everything in between scales from those two.
One caution before you lean on the table. A GeoNames centre is a single point, usually somewhere near the historic core, and a city isn’t a point. Chestermere is listed at 18.7 km because that’s the gap between two reference points. Its nearer edge is closer than that, probably by a good margin.
Empty band. Inside 5 km there’s no place big enough for the dataset to carry.
No entries. This band covers 236 km² and nothing in it clears the 15,000 floor.
1 place between 10 and 25 km, 32,255 people, 1,649 km² of ground.
| Place | Distance | Bearing | Population |
|---|---|---|---|
| Chestermere | 18.7 km | E 96° | 32,255 |
3 places between 25 and 50 km, 152,457 people, 5,890 km² of ground.
| Place | Distance | Bearing | Population |
|---|---|---|---|
| Airdrie | 28 km | N 7° | 90,044 |
| Cochrane | 30.6 km | WNW 299° | 32,199 |
| Okotoks | 36.4 km | S 169° | 30,214 |
Place names, coordinates and populations come from GeoNames, which the site uses under CC BY 4.0.
Area climbs with the square of the radius, and it catches people out every time. The 5 km disc around Calgary covers 79 km². The 25 km one covers 1,963 km², twenty-five times as much for five times the distance. By 50 km you’re looking at 7,854 km² of Alberta and whatever lies past its edges.
| Radius | Area inside (km²) | This band only (km²) | Places in band | People in band |
|---|---|---|---|---|
| 5 km | 79 | 79 | 0 | 0 |
| 10 km | 314 | 236 | 0 | 0 |
| 25 km | 1,963 | 1,649 | 1 | 32,255 |
| 50 km | 7,854 | 5,890 | 3 | 152,457 |
Those areas are worth holding against the ring counts. 7,854 km² inside the outer circle, and GeoNames puts 4 named settlements in all of it. A density figure off that would be meaningless, so there isn’t one here. What the areas are good for is sizing: knowing the 25 km ring covers 1,963 km² tells you how much ground a service area at that radius has to reach across.
These are straight-line rings. That’s the right tool for a coverage question and the wrong one for travel time. A 30-minute drive out of Calgary comes out as a lopsided blob, an isochrone, racing down a motorway and stopping dead at a bridge. Drawing one properly takes a routing server. This site hasn’t got one, deliberately, because everything runs in your browser with no account and nothing uploaded.
Plenty of sites draw a plain circle, label it drive time and leave it there. Those are worth ignoring. A proper isochrone needs a road graph, turn restrictions and some idea of traffic, and it changes shape by the hour. What a circle gives you instead is a bound that doesn’t move: nothing outside the 25 km ring is within 25 kilometres of Calgary, whatever the roads do.
On the arithmetic. Distances are great-circle distances on a sphere of radius 6,371.0088 km, worked out with the haversine formula, and each bearing is the initial heading you’d take leaving Calgary. Areas use the spherical cap rather than πr², which shaves a hair off the flat answer. About one part in seventy thousand at 50 kilometres. Invisible, and true anyway.
One oddity you’ll notice if you compare pages. Population counts come from GeoNames, which records what the national statistics office last published, so some are a few years old and a couple are more. They’re good for ranking and for rough sizing. The figure carried for Calgary is 1,306,784, which for some cities means the municipality and for others the whole urban area, so compare it with care.
What people actually use these rings for, roughly in order of how often it comes up: delivery and service areas, finding somewhere to live within a sensible distance of work, sizing a catchment for a shop or a clinic, checking how far an event’s noise and traffic will carry. Straight-line distance is the right first pass for all of them.
The five closest cities with their own page are listed below, measured from this same centre. Edmonton is nearest at 281.1 km north, which means its 50 km ring never comes anywhere near this one.