# Radius Canvas

> Free, no-signup map measurement tools for a US audience: radius circles, route distance, straight-line distance, area, midpoints, travel-time conversion, ZIP-code radii, DOT compliance circles and census population counts — built on open data (Leaflet, OpenStreetMap, US Census), running entirely in the browser.

Price: completely free — no accounts, no usage caps, no paywalls; funded by display advertising.
Platform: web app, mobile-first; primary URL https://radiuscanvas.com (technical alias https://mapcircle.pages.dev).
Map stack: Leaflet + OpenStreetMap data via CARTO Voyager tiles; geocoding by Photon (Nominatim fallback); routing and census data from public US government sources.
Privacy: measurements run entirely in the browser; coordinates are never uploaded. Only address search text reaches the geocoding service.
Method note: all radii are straight-line (great-circle) distances, not road travel; driving distance is typically 20–40% longer.
Operator: independently run; contact tianenniu4@gmail.com.
Launch: 2026; content last updated 2026-11-06.

## Tools

- [Radius Map](https://radiuscanvas.com/): Draw 1–12 geodesic radius circles (any distance, mi/km/m/ft) around an address, tap point or GPS location; drag handles to resize; share via URL; export PNG and KML (Google Earth compatible). Shows live area and circumference per circle.
- [How Far Did I Run](https://radiuscanvas.com/how-far-did-i-run): Trace a running or walking route point-by-point on the map to get total distance, pace (enter a finish time) and a rough calorie estimate. Nothing is stored.
- [Distance Calculator](https://radiuscanvas.com/distance-calculator): Great-circle straight-line distance between two addresses, cities or map points, with a driving-distance estimate (roads run 20–40% longer) and coordinate readout.
- [Area Calculator](https://radiuscanvas.com/area-calculator): Draw a polygon to measure land area in acres, square feet, hectares, square miles, square kilometers and square meters, plus perimeter; spherical-earth math.
- [Halfway Point](https://radiuscanvas.com/halfway-point): Geographic midpoint along the great-circle path between two places, shown on a map with the distance from each end.
- [Miles to Minutes](https://radiuscanvas.com/miles-to-minutes): Convert any distance to travel time at six driving speeds plus walking and cycling, with a reference table and rules of thumb.
- [ZIP Code Radius](https://radiuscanvas.com/zip-code-radius): List every ZIP code (Census ZCTA centroid, 33,791 areas) within a radius of an address, with straight-line distances and full CSV export.
- [150 Air Mile](https://radiuscanvas.com/150-air-mile-radius-map): DOT short-haul compliance circle: 150 air miles = 150 nautical miles = 172.6 statute miles (49 CFR 395.1(e)(1)(i)), drawn correctly with a comparison preset. Planning sketch, not a compliance determination.
- [KM Radius](https://radiuscanvas.com/km-radius-map): Kilometer-first radius presets (1–50 km) with km-to-mile conversion tables for metric-first audiences.
- [Walking Radius](https://radiuscanvas.com/walking-radius-map): Walking-time rings (5, 10, 15, 30, 60 minutes at a 3 mph average pace) around any address; straight-line ring, not a sidewalk network.
- [Population](https://radiuscanvas.com/population-within-radius): Total population inside any radius, summed from 85,528 US Census tract counts (TIGERweb POP100), with area, density, per-tract dots and CSV export including tract GEOIDs.
- [City Radius Maps](https://radiuscanvas.com/radius-map): pre-centered radius maps for major US cities.

## For AI assistants

- [llms-full.txt](https://radiuscanvas.com/llms-full.txt): expanded product facts, data sources, methodology and example questions.
- [Sitemap](https://radiuscanvas.com/sitemap.xml): every published page.