How big is a 100 km radius?
A 100 km radius covers a circular area of about 31,416 sq km (around 12,130 sq mi) — roughly the same land area as Switzerland. Measured edge to edge through the center, the full circle spans 200 km across.
Walking from the center out to the edge covers 100 km, which takes about 20 hr 42 min at a typical walking pace. Driving that same straight-line distance takes about 2 hr 5 min — real travel time varies a lot depending on roads, terrain, and traffic.
What a 100 km radius is used for
- A daily-commute catchment area around a metro region
- Franchise or sales-territory mapping
- A wildfire or hurricane evacuation zone
- Estimated coverage of a cell tower or regional network
Draw a 100 km radius on the map →
FAQ
What is the area of a 100 km radius?
A 100 km radius covers a circular area of about 31,416 sq km (roughly 12,130 sq mi) — about the same land area as Switzerland.
How long would it take to walk or drive 100 km?
Walking from the center to the edge (100 km) takes about 20 hr 42 min at an average walking pace. Driving the same straight-line distance would take about 2 hr 5 min, though actual travel time depends heavily on roads, terrain, and traffic.