How big is a 100 mile radius?
A 100 mile radius covers a circular area of about 31,416 sq mi (around 81,367 sq km) — roughly the same land area as South Carolina. Measured edge to edge through the center, the full circle spans 200 miles across.
Walking from the center out to the edge covers 100 miles, which takes about 33 hr 20 min at a typical walking pace. Driving that same straight-line distance takes about 3 hr 20 min — real travel time varies a lot depending on roads, terrain, and traffic.
What a 100 mile radius is used for
- State- or province-level regional planning
- The footprint of a large storm system, like a hurricane
- A regional airport’s catchment area
- Disaster-relief or logistics planning at scale
Draw a 100 mile radius on the map →
FAQ
What is the area of a 100 mile radius?
A 100 mile radius covers a circular area of about 31,416 sq mi (roughly 81,367 sq km) — about the same land area as South Carolina.
How long would it take to walk or drive 100 miles?
Walking from the center to the edge (100 miles) takes about 33 hr 20 min at an average walking pace. Driving the same straight-line distance would take about 3 hr 20 min, though actual travel time depends heavily on roads, terrain, and traffic.