Area & Radius Measurement

How big is that field, that neighborhood, that delivery zone? This collection measures areas and distances on interactive maps. The Area Calculator lets you draw a polygon by clicking points on the map and computes the enclosed area with spherical geometry — the result is shown in square kilometers, square miles, hectares and acres, along with the perimeter of your shape. The Polygon Map offers the same drawing workflow for visualizing boundaries, while the Radius Map and Circle Map draw circles of a chosen radius around a point: pick a center, set a radius in kilometers or miles, and see exactly which streets, towns or customers fall inside. The Delivery Radius Calculator applies the same idea to business use — defining a service area around a store or restaurant.

All measurements are computed in the browser from the coordinates you draw, so the map is fully interactive: drag points to reshape a polygon, move the circle center, change the radius and watch the numbers update. Because the Earth is a sphere, areas are calculated with geodesic math rather than flat-map approximations, which matters once your shapes span more than a few kilometers.

The map scale guide connects these tools to paper and printed maps: it explains representative-fraction scales like 1:50,000, verbal scales like "one inch to the mile", and graphic scale bars, and shows how to convert a measured map distance into a real-world figure. Understanding scale is what lets you judge whether an area you measured on screen matches the distances on a printed trail map or a property survey.

Use these tools for land measurement, garden and farm planning, delivery-zone design, catchment analysis, school projects or any question that starts with "how big is this area?". For quick estimates, the radius tools double as rough area calculators: a 5 km circle covers about 78.5 square kilometers, which is a useful sanity check against the polygon result.