Walking & Cycling Radius Map
Why pedestrian and cycling isochrones are different
A walking or cycling isochrone is not just a slower drive-time map. The way a pedestrian or cyclist experiences distance is governed by a different set of variables — sidewalk completeness, signal-crossing waits, hill grade, perceived safety, and the walker's own physical profile. A 15-minute walking radius drawn naively as “5 km/h × 15 min = 1.25 km” overstates reachable area in most real cities by 20–40%. This page is the reference material for using the tool above with that nuance.
For straight-line radii or driving isochrones, see the main radius tool or drive time map.
Walking Radius vs. Straight-Line Radius
A walking radius map shows the area you can actually reach on foot within a time limit — it follows sidewalks, paths, crosswalks, and walkable streets. A straight-line radius shows a perfect circle based on distance “as the crow flies.”
The difference can be dramatic: a 15-minute walk might cover only 0.7 miles in a grid-pattern city, but the straight-line distance is roughly 1.2 km in every direction.
Walking Isochrone
- Follows actual sidewalks and paths
- Accounts for road network
- Realistic reachable area
- Irregular polygon shape
Straight-Line Radius
- Perfect circle shape
- “As the crow flies” distance
- Ignores obstacles & roads
- Good for coverage analysis
How walking distance is calculated
The tool uses a default walking speed of 5 km/h (3.1 mph) and routes along pedestrian-accessible paths from OpenStreetMap data — sidewalks, pedestrian streets, shared paths, and quiet residential streets where sidewalks are implied. It excludes motorways, highway shoulders, and roads explicitly tagged as foot-prohibited.
That 5 km/h figure is the average from multiple international studies and is the speed embedded in most planning standards (the 15-minute city framework, the EU's urban accessibility metrics, the Japanese 80 m/min property-listing pace). But the actual distance a real pedestrian covers in 15 minutes deviates from the theoretical 1.25 km for at least five reasons that the tool can't model from OSM data alone:
- Signal-crossing wait times. Pedestrians lose time at every signalised crossing — typically several seconds in dense urban grids and substantially more in sprawled US suburbs with infrequent pedestrian phases. Across a 15-minute walk, this accumulates into a real fraction of effective time.
- Sidewalk completeness. OSM tags
sidewalk=*when known, but coverage is uneven. In US car-oriented suburbs, missing-sidewalk segments force long detours; in dense European centres the network is effectively complete and the isochrone matches reality. - Hill grade and Tobler's hiking function. Tobler's empirical function gives walking speed as 6·exp(−3.5·|slope + 0.05|) km/h — uphill grades meaningfully drop walking speed below the flat default. Isochrones drawn at flat 5 km/h overstate reach in hilly cities like San Francisco, Lisbon, or Hong Kong.
- Perceived safety detours. Real pedestrians avoid unlit underpasses, freeway underbridges, and high-traffic arterials at night, even if they're technically walkable. Active-transportation research consistently finds real route choice can be substantially longer than shortest-path during evening hours.
- Personal speed. Studies of crowd-level pedestrian speed (Knoblauch 1996, TRB) find the 15th-percentile walker is at 1.0 m/s (3.6 km/h) while the 85th-percentile is at 1.5 m/s (5.4 km/h). The 5 km/h default is approximately the mean, not the lower bound.
Practical implication: a 15-minute walking circle drawn here is best read as “the area a healthy adult can reach in 15 minutes on a complete sidewalk network with no signals or hills.” In real cities, subtract 20–40% from the radius value for a defensible accessibility estimate, especially for service-area or school-zone planning.
Pedestrian profiles: not every walker is “average”
The 5 km/h default is the working assumption for healthy adult walkers. For accessibility, public-health, or school-catchment analysis, you usually want to model the slower walker, not the average one — because policy decisions made at the average speed exclude the people who most need the access. Reference values from the transportation-engineering and gerontology literature:
| Walker profile | Typical speed | 15-min reach | Source / context |
|---|---|---|---|
| Healthy adult (default) | 5.0 km/h | 1.25 km | WHO / 15-minute city |
| Older adult, 65+ | 3.6 km/h | 900 m | Gerontology literature |
| Adult with stroller | 3.8 km/h | 950 m | Family-mobility studies |
| Child 5–10 with adult | 3.2 km/h | 800 m | Safe Routes to School |
| Manual wheelchair user, flat | 3.6–5.4 km/h | 900 m–1.35 km | Disability-mobility research |
| Adult with mobility aid (cane) | 2.5–3.5 km/h | 625–875 m | Pedestrian Signal Timing Guide (FHWA) |
| Brisk fitness walk | 6.4 km/h | 1.6 km | Cardiovascular target zone |
If you're designing for inclusive accessibility, use 3.6 km/h as the planning value, not 5. The 0.9 km/15 min reach should be the standard against which you draw school catchments, senior-housing accessibility, and health-clinic walkable zones.
How cycling distance is calculated
The cycling mode uses a default speed of 15 km/h (9.3 mph) and prefers OSM-tagged cycle infrastructure: protected lanes, cycle paths, bike-friendly residential streets. It avoids motorways and routes the cyclist around them rather than through them.
15 km/h is the cruising pace of an unhurried commuter on a hybrid or city bike. The cycling-speed literature shows a much wider distribution than walking, driven by three factors:
- Equipment. A heavy Dutch omafiets carrying groceries cruises at 12 km/h; a road bike with clipless pedals on the same route does 25 km/h. E-bikes with pedal assist (legal limit 25 km/h EU / 20 mph US) effectively let any rider hit the upper end. The default isochrone is approximately the speed of a Class 1 e-bike.
- Infrastructure quality. Protected lanes raise average speed because cyclists don't need to slow at every intersection. Painted-only bike lanes provide negligible speed benefit; sharrows provide none. Cities with extensive protected cycling networks consistently model higher average cyclist speeds than cities relying on painted lanes alone.
- Gradient sensitivity. Cyclists lose more time to climbs than walkers (in relative terms). A 4% grade roughly halves a casual cyclist's speed; the same grade drops a walker by ~30%. For hilly cities like San Francisco, Lisbon, or Wellington, the cycling isochrone you draw at flat 15 km/h is meaningfully optimistic.
For analyses that need to distinguish commuter pace from e-bike pace from recreational pace, model three different speeds (12, 18, 25 km/h) and compare their isochrones rather than relying on a single default.
Walking & Cycling Speed Reference
Walking Speeds by Type
Cycling Speeds by Type
Distance Covered by Time
| Time | Walking (5 km/h) | Brisk Walk (6.4 km/h) | Cycling (15 km/h) | Fast Cycling (25 km/h) |
|---|---|---|---|---|
| 5 min | 420 m (0.26 mi) | 530 m (0.33 mi) | 1.25 km (0.78 mi) | 2.1 km (1.3 mi) |
| 10 min | 830 m (0.52 mi) | 1.1 km (0.67 mi) | 2.5 km (1.55 mi) | 4.2 km (2.6 mi) |
| 15 min | 1.25 km (0.78 mi) | 1.6 km (1.0 mi) | 3.75 km (2.3 mi) | 6.25 km (3.9 mi) |
| 20 min | 1.67 km (1.04 mi) | 2.1 km (1.3 mi) | 5.0 km (3.1 mi) | 8.3 km (5.2 mi) |
| 30 min | 2.5 km (1.55 mi) | 3.2 km (2.0 mi) | 7.5 km (4.7 mi) | 12.5 km (7.8 mi) |
| 45 min | 3.75 km (2.3 mi) | 4.8 km (3.0 mi) | 11.25 km (7.0 mi) | 18.75 km (11.6 mi) |
| 60 min | 5.0 km (3.1 mi) | 6.4 km (4.0 mi) | 15 km (9.3 mi) | 25 km (15.5 mi) |
The 15-Minute City Concept
Urban planners frequently use the “15-minute city” concept — the idea that essential services (grocery, school, healthcare, transit) should be within a 15-minute walk or bike ride. This planning philosophy promotes walkable, sustainable neighborhoods.
A 15-minute walking isochrone from your home shows what you can access on foot and is a useful way to evaluate neighborhood walkability before moving or investing.
What Should Be Within 15 Minutes?
The framework has critics worth taking seriously. Critics on the planning-research side argue 15 minutes is too permissive for genuine accessibility, and propose tighter chrono-urbanism targets for the core daily needs. Critics on the political side note that 15-minute cities have been mischaracterised online as movement-restriction schemes, which they are not; the framework is purely about co-locating amenities, not constraining travel. Both critiques are worth knowing before citing the framework in a planning document.
The 10-minute-walk-to-park standard in public health
Independent of the 15-minute city framework, the public-health and parks-policy literature has converged on a tighter walking-radius benchmark: every resident should live within a 10-minute walk (roughly 800 m) of a public park or green space. This is the explicit policy goal of the Trust for Public Land's 10-Minute Walk Campaign, adopted by hundreds of US mayors, and underpins the World Health Organization's urban green-space recommendations.
The 800 m figure is grounded in epidemiological research. Studies in the public-health literature consistently find that park usage drops sharply beyond a 10-minute walking radius — proximity is one of the strongest predictors of how often people actually use a green space, controlling for income and demographics. The 800 m radius is the operational threshold below which park access produces measurable cardiovascular and mental-health benefits at population scale.
Practical use of the tool: draw a walking isochrone or 800 m straight-line radius around each park in a target neighbourhood. The fraction of the neighbourhood outside any of these circles is the park-access deficit. For an equity analysis, overlay the deficit map with demographics (which neighbourhoods have park access; which don't). This is the standard methodology used by the Trust for Public Land's ParkScore index, by the WHO's Urban Health Initiative, and by most municipal parks-strategic-plan documents in 2024–2026.
Note the distinction from the 15-minute framework: the 10-minute-to-park standard applies only to green space, not to general amenities, and uses 800 m (not 1.25 km) as the threshold because health research is more sensitive to distance than amenity-co-location research.
School walkability and Safe Routes to School
School catchment analysis is the single most common use of walking radius tools by non-specialists. The questions parents and planners ask: how far can a 7-year-old actually walk to school? What proportion of the school district lives close enough to walk? Which crossings need investment to make walking viable?
The reference standards differ by country. US Safe Routes to School treats a half-mile (800 m) as the “walkable” threshold for elementary, and a mile (1.6 km) for middle school. Australian school-zone standards in most states use a 1.6 km radius. UK statutory walking distances (Education Act 1996 / Department for Education) are 2 miles (≈3.2 km) for children under 8 and 3 miles (≈4.8 km) for ages 8+, but these are transport-eligibility thresholds, not walkability assessments. Japan uses 2 km tsugakku (通学区) boundaries that are nearly always pedestrian.
When you use the tool for a school-walkability check, three modelling choices matter:
- Use child walking speed, not adult. 3.2 km/h for elementary, not the default 5 km/h. The 15-minute reach drops from 1.25 km to 800 m.
- Include the worst crossing in the route. Active-transport research shows parents' decision to allow walking is dominated by the single worst intersection along the route, not the average. A walkable isochrone that crosses an unsignalised four-lane arterial is not effectively walkable for an 8-year-old, even if the total distance is acceptable.
- Layer in time-of-day constraints. Many school-walk routes are only accessible during daylight, which excludes morning starts in northern-latitude winters. The walking-radius tool draws a geometric isochrone; the operationally walkable subset is smaller during dark months.
For municipal-scale Safe Routes planning, the walking radius is the screening step. Routes inside the radius are candidates; the next step is auditing each candidate route's intersection safety, sidewalk presence, and grade. Tools like this one don't replace that audit — they tell you which routes are worth auditing.
Walk Score, Bike Score, and what they measure
Walk Score (and its siblings Bike Score and Transit Score) is the most widely cited third-party walkability metric in US real estate listings. Owned by Redfin since 2014, it produces a 0–100 score for any address by measuring walking distance to amenities across nine categories: grocery, restaurants, shopping, errands, parks, schools, culture/entertainment, coffee, and banks. Distances are decay-weighted: nearby amenities count at full weight, with the contribution dropping smoothly to zero at the maximum walkable distance.
What Walk Score does well: it's a standardised, comparable score that surfaces differences between neighbourhoods that would otherwise be hard to quantify. A score of 90+ (“Walker's Paradise”) reliably identifies dense, mixed-use urban cores; a score under 25 (“Car-Dependent”) reliably identifies exurban or rural patterns.
What it doesn't do: it treats every category as equally important, which doesn't match how individual households weight access (a family with school-age children weights school proximity much higher than a young couple does). It also assumes amenity density at the destination, not the quality of the walking infrastructure along the way — a Walk Score of 85 can describe a neighbourhood with many amenities but no sidewalks, which is not walkable in practice. The walking radius tool above is complementary: Walk Score answers “what's near here?”; the isochrone answers “what can I actually reach on foot?”
Bike Score uses similar methodology over a longer radius, weighting protected infrastructure, hill grade, and amenity density. It correlates strongly with actual bike-commute mode share in cities where it's been validated against census data.
How urban layout affects walking reach
Illustrative ranges showing how city layout shapes how much a 15-minute walk covers — these aren't measured data, and your specific neighbourhood will differ.
| City Type | Example Cities | 15-Min Walk Covers | Walk Score Range |
|---|---|---|---|
| Dense Grid | Manhattan, Chicago Loop, SF Downtown | ~1.0 km (12+ blocks) | 90-100 |
| Mixed Urban | Boston, Seattle, Portland | ~1.1 km | 70-90 |
| Traditional Suburbs | Older East Coast suburbs | ~1.0 km | 50-70 |
| Car-Oriented Suburbs | Most Sun Belt suburbs | ~0.8 km (limited paths) | 25-50 |
| Sprawl/Exurbs | Outer Phoenix, Houston sprawl | ~0.6 km (few sidewalks) | 0-25 |
Illustrative effective walking distance by layout
* Based on 5 km/h walking speed. Actual coverage varies by specific location and pedestrian infrastructure.
Health Benefits of Walking & Cycling
Understanding your walkable and bikeable range isn't just about convenience — it's about building sustainable exercise into daily life. Research shows that people in walkable neighborhoods get significantly more physical activity.
Walking Benefits
- • Cardiovascular conditioning
- • Reduces sedentary-time risk factors
- • Improves mental health & mood
- • Zero equipment needed
Cycling Benefits
- • Low-impact on joints
- • Extends commute range over walking
- • Aerobic conditioning at moderate intensity
- • Can replace short car trips
Methodology and sources
Speed assumptions, walkability standards, and demographic figures on this page are drawn from publicly available planning and public-health literature. Where a specific value is cited, the underlying source is listed below so you can confirm the figure against the primary document.
- Tobler, W. (1993). Three Presentations on Geographical Analysis and Modeling. UCSB — source for the hiking function used in hill-grade modelling.
- Knoblauch, R. L., et al. (1996). Field Studies of Pedestrian Walking Speed and Start-Up Time. Transportation Research Record — source for the 15th/85th percentile pedestrian speed distribution.
- Federal Highway Administration (US), Pedestrian Signal Timing Guide — source for walker-with-mobility-aid speed values.
- Trust for Public Land, 10-Minute Walk Campaign and ParkScore Index Methodology — source for the 800 m park-access threshold and equity overlay methodology.
- Carlos Moreno, The 15-Minute City (2016) and subsequent publications via the Sorbonne / IAE Paris — source for the chrono-urbanism framework.
- National Center for Safe Routes to School (US) and equivalent national programs (Living Streets UK, VicHealth Active Travel AU) — source for school-walking-distance standards by age group.
- Walk Score / Redfin, public methodology documentation — source for amenity-decay weighting and category coverage.
- World Health Organization, Urban Green Spaces and Health (2016, with 2024 updates) — source for population-scale health benefits of park access.
- OpenStreetMap pedestrian and bicycle routing tag conventions, OSM Wiki — source for how the underlying isochrone engine interprets sidewalk and bike-infrastructure data.
Isochrone calculation uses OpenStreetMap data via OSRM/Valhalla routing engines. Routes are shortest-path approximations; they don't account for crossing wait times, real-time signal phases, or perceived-safety detours. Use the radius value as a planning input, not a guarantee of accessibility.