How do I measure distance in Google Earth for flight planning?

For Aviation & Real-World Flying and flight-simulator planning, open Google Earth's Ruler or Measure tool, select Path, set the unit to nautical miles, then mark the departure point, each waypoint and the destination in order. The total is an approximate ground-track distance, not a validated or flyable aviation route.

How to measure a flight route in Google Earth

Google Earth Pro on desktop calls the tool Ruler, while browser and mobile editions generally use Measure. The interface varies, but the method is the same: create an ordered path through the points the aircraft is expected to cross.

1. Define the endpoints. Decide whether you are measuring between airport reference coordinates, airport centres or runway thresholds. Use the same convention at both ends.
2. Find the departure point. Search by airport name, identifier or coordinates. A label may be positioned over a terminal rather than the airport's published reference point. If a short place name produces several results, add its region or country, or enter coordinates.
3. Find the destination. Confirm that Google Earth has selected the intended airport or location before placing a measurement point.
4. Open Ruler or Measure. In Google Earth Pro, open Ruler and select the Path option. In browser and mobile editions, open Measure; the first point starts the path and later points create additional legs.
5. Use a vertical view. Looking straight down makes it easier to place points accurately. A tilted view can make a runway threshold, road junction or visual reporting point harder to select.
6. Select nautical miles. Choose NM or nautical miles where the edition provides a unit selector. If only kilometres or statute miles are displayed, convert the result using the table below.
7. Add every planned waypoint. Click the departure point, en-route fixes, turning points and destination in sequence. For an IFR route, include the departure, airway, arrival and approach fixes that form part of the planned routing.
8. Inspect and record the result. Zoom in on each vertex, remove accidental points and drag misplaced points where the interface allows it. Record both the cumulative total and the length of each leg if you are preparing a navigation log.

A mistake we see constantly is measuring one direct airport-to-airport line and comparing it with a planner that includes procedures and airways. Those are different routes, so they should not produce the same total.

Does Google Earth show the shortest air distance?

A single measured line gives an approximate shortest surface distance between the selected coordinates, broadly comparable to a great-circle or geodesic distance. It does not find the shortest route an aircraft may legally or practically fly.

A path through several points is the sum of those individual legs. Our explanation of why direct airport distance differs from a route through waypoints covers the distinction in more detail.

The ordinary measurement is principally horizontal. It does not add the aircraft's complete three-dimensional movement during climbs, descents, turns or holds. Avoid terrain-following and 3D measurement modes when you need standard aviation route mileage; those modes answer a different question.

How do I measure air distance in Google Maps?

Google Maps can measure approximate flight distance, but only as a straight line or manually plotted series of segments. Road directions, walking routes and the distance shown for a place search are not air-route measurements.

Using Google Maps on a desktop browser

1. Locate the departure point. Zoom in far enough to select the correct airport position, runway threshold or coordinate.
2. Start measuring. Open the point's context menu and choose Measure distance.
3. Add the destination. Click the destination for a direct air-distance estimate.
4. Plot the route if required. Click each waypoint in order. Drag points to correct them or select an unwanted point to remove it.
5. Read the cumulative distance. Google Maps normally displays kilometres or statute miles according to regional settings, rather than nautical miles.

Using the Google Maps mobile app

1. Drop a pin. Touch and hold an unlabelled point at the departure location. Selecting a business or place label can hide the measurement command.
2. Open the pin information. Choose Measure distance from the available actions.
3. Move the crosshair. Centre it on the destination or next waypoint and add the point.
4. Continue through the route. Add each waypoint and read the accumulated total.

For a quick air-distance check, Google Maps is adequate. It does not calculate a published airway route, account for controlled or restricted airspace, or predict the exact track a scheduled flight will follow.

Can I see the same route on Google Maps?

You can see an equivalent route by plotting the same coordinates or waypoints manually. A path saved in Google Earth does not automatically become an aviation route in the ordinary Google Maps interface, and a KML or KMZ path is not a simulator flight plan.

Choose Google Earth when you need globe-based visual inspection, terrain context, placemarks or a saved path. Choose Google Maps for a quick browser or mobile measurement. Our practical comparison of Google Earth and Google Maps for simulator planning explains where each tool is most useful.

Can I fly on Google Maps?

No. Google Maps can show satellite imagery and measure a line, but it is not a flight simulator and has no cockpit flight mode.

Desktop Google Earth Pro includes a basic Flight Simulator feature. It is useful for viewing terrain from the air, but a measured path does not become an autopilot route and the simulator is not a substitute for an aviation flight planner. See our guide to the practical controls used in Google Earth's flight simulator if your aim is to fly rather than measure.

Should flight distance be measured in nautical miles?

Nautical miles are the standard unit for aviation route distance. Aircraft speed over the ground is expressed in knots, and one knot means one nautical mile per hour.

Do not confuse knots with nautical miles. Knots measure speed; nautical miles measure distance. The basic estimate is flight time in hours = distance in NM / groundspeed in kt. For example, 120 NM at a groundspeed of 100 kt takes 1.2 hours, or 72 minutes.

Use forecast or observed groundspeed rather than airspeed because wind changes the time required to cover a fixed map distance. For multi-leg planning, our guide to turning measured legs into a nautical-mile flight log explains how to total the route and compare it with the distance shown in the cockpit.

Why does Google Earth distance differ from my flight planner?

The most common causes are different endpoints, different route definitions and inaccurate point placement. The small difference between geographic calculation models is usually less significant than measuring the wrong route.

Displayed decimal places are not proof of accuracy. A distance created by clicking imagery should be rounded to a precision justified by the map scale and the purpose of the measurement.

How accurate is Google Earth for flight planning?

Google Earth is accurate enough for preliminary distance estimates, visual simulator planning and cross-checking route geometry. It has no aviation-grade guarantee, and it does not validate whether the measured route is safe, legal, available or supported by the simulator's navigation data.

For flight simulation, build or verify the final route in the simulator or a compatible aviation planner. If its distance differs from Google Earth, first make the endpoints and waypoint sequence identical; then use the navigation data associated with the simulator for the route that will actually be loaded.

For real-world flying, verify the route against applicable aviation charts and authoritative information for airspace, procedures, obstacles, weather, NOTAMs, runway status, fuel and aircraft performance. Satellite imagery and terrain elevation are useful visual references, but they are not operational navigation or obstacle-clearance sources.