Travel & geography
328 travel and geography tools: distances between places, coordinates, fuel and trip costs, weather indices and local time. Plan a route or check a figure before you leave, free in your browser.
Fuel cost calculator
Enter 100 km, a car that uses 8 L/100 km and fuel at 1.50 per liter: the trip needs 8 liters and costs 12.00.
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Heat index calculator
At 90 °F and 70% humidity it feels like 105.9 °F. Enter the air temperature and relative humidity to get the official heat index, with the full regression in…
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Gall–Peters projection calculator
On the Gall–Peters map with a radius of 1, the point at 0° latitude and 0° longitude sits at x 0 and y 0, the centre of the map.
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Geocentric radius calculator
At latitude 0° on WGS84, the geocentric radius is 6378137 m, the full equatorial radius. Enter a geodetic latitude and, if you like, a height above the…
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Vertical sextant angle distance
An object 100 metres tall seen at a vertical angle of 45° is 100 metres away. Enter the known height and the sextant angle between its top and its base, and get…
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Haversine distance - great-circle km, mi and m between two points
Get the great-circle distance between two GPS points in kilometres, miles and metres at once: from 40.7128, -74.006 to 51.5074, -0.1278 it is 5570.22218 km…
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Initial bearing calculator
Leaving London for Paris along the great circle, you set off on a bearing of 148.115617°, labelled SSE on the 16-point compass.
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Crosswind component calculator
A 20-knot wind at 30° to the runway gives a crosswind of 10 knots and a headwind of 17.320508 knots, because the sine of 30° is one half.
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Geohash encoder
Turn a latitude and longitude into a short geohash: 37.7749 and -122.4194 at nine characters become 9q8yyk8yt, a key about the size of a city block that groups…
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Geographic midpoint calculator
The halfway point between 40.7128, -74.006 and 34.0522, -118.2437 is 39.51030757, -97.16013189: the middle of the shortest path over the globe, not a plain…
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Geographic polygon perimeter
The ring (0, 0), (0, 1), (1, 1), (1, 0) measures 444.763384955 km around, or 276.363154773 miles, along great-circle edges on a sphere.
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Pythagorean equirectangular distance
Get a quick ground distance between two nearby points by treating the map as a flat local plane: two Manhattan coordinates come out just over 5 km apart.
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EV trip charging cost
A 250 km drive at 18 kWh per 100 km draws 45 kWh, and the tool turns that into the trip's charging cost at your electricity price, plus the cost per kilometer.
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Along-track distance calculator
Project Paris onto the London to New York great circle and the along-track distance is −264.107681 km: the closest point lies behind London.
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Compass direction to bearing
SW by S, Southwest by South, is 213.75°: write a direction the way a pilot book or an old ship's log does, and get the heading in degrees clockwise from true…
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Geohash decoder
Paste a geohash such as u4pruydqqvj and get the center latitude and longitude of its cell, plus margins that show how wide the cell is; eleven characters narrow…
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Great-circle path intersection
Enter two start points with their true bearings and see where the great-circle courses meet: 51.8853 N, 0.2545 E on 108.547° and 49.0034 N, 2.5735 E on 32.435°…
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Magnetic to true bearing
Convert a compass bearing to a true bearing with your local declination; magnetic 45° with 5.5° east gives true 50.5°, and the reverse conversion back to…
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Geographic polygon area
A one-degree box at the equator with corners (0, 0), (0, 1), (1, 1) and (1, 0) covers 12363.71814518 km² on a mean-Earth sphere: a true surface area from map…
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Rhumb line distance calculator
Measure the length of a constant-heading route between two points: from 51.5074, -0.1278 to 40.7128, -74.006 the rhumb line is 5794.128754 km at a steady…
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Map tile to lat/lon
Find the north-west corner of any web map tile from its column, row and zoom: tile 0/0/0 starts at 85.0511287798° north and 180° west.
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UTM to lat/lon converter
Zone 33 north with easting 500,000 m and northing 4,649,776.22482 m sits at latitude 41.9999999991° and longitude 15°, right on the zone's central meridian.
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Web Mercator projection calculator
Latitude 40.7128 and longitude -74.006 project to X -8238310.235647004 m and Y 4970071.579142427 m on the EPSG:3857 plane behind most online maps.
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Carry-on size checker
A 55 × 40 × 20 cm bag fits a 56 × 45 × 25 cm allowance with 1 cm to spare on the longest side, and the checker turns the bag the way a gate sizer would before…
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EV range calculator
A 75 kWh battery using 15 kWh per 100 km with 90 % usable charge covers 450 km. Enter pack size, efficiency and usable share to see whether a leg fits on one…
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Jet lag recovery calculator
Fly six time zones east and the rule of thumb gives 6 days to readjust; six zones west, only 3, because delaying sleep is easier than advancing it.
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Layover connection time checker
Landing at 10:30 and leaving at 14:00 gives a 3 h 30 min layover, which clears a 60-minute minimum connection with 150 minutes to spare.
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Trip fuel volume calculator
500 km at 7.5 L/100 km burns 37.5 litres, which is 9.9065 US gallons or 8.2488 imperial gallons. Enter the distance and your economy in L/100 km, km per litre…
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Trip total cost calculator
Get the whole budget for a 5-day road trip: fuel and tolls count once, lodging and food are multiplied by the days, and you see the daily rate and each…
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Antipode coordinates calculator
The antipode of New York (40.7128° N, 74.006° W) is 40.7128° S, 105.994° E: the latitude flips sign and the longitude moves 180°.
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Bearing to compass direction
A bearing of 22.5° reads as NNE, North-Northeast, and −45° wraps round to NW. Enter any heading in degrees and get the nearest of the 16 classic compass…
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Point-radius bounding box
A 5000 m radius around 40.7128, −74.006 becomes the minimum and maximum latitude and longitude of a box that fully encloses the circle, ready for a quick range…
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Cross-track distance calculator
A fix at 53.2611, −0.7972 sits 307.5495704195 m to the right of the great-circle track between two waypoints.
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Decimal degrees to DMS converter
A latitude of 40.7128 becomes 40° 42′ 46.08″ N: pick latitude or longitude, and the converter splits the number into degrees, minutes and seconds, takes the…
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Length of a degree of latitude
At 45° of latitude, one degree from south to north covers about 111 km, close to 60 nautical miles.
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Length of a degree of longitude
At the equator one degree of longitude spans about 111.32 km, and the same step shrinks toward the poles until it reaches zero.
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Destination point calculator
Leave 51.4778° N, 0.0015° W on a bearing of 45° for 10000 m and you arrive at 51.5413472357° N, 0.100745643529° E.
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DMS to decimal degrees converter
40° 26′ 46.8″ N becomes 40.446333333333: degrees plus minutes over 60 plus seconds over 3600, with the sign taken only from the hemisphere letter, so south and…
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Equirectangular distance
From 40.7128, -74.006 to 40.758, -73.9855 the equirectangular shortcut gives 5314.523521 m, or 5.314524 km.
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Great-circle interpolation
Halfway along the great circle from 40.7128, -74.006 to 51.5074, -0.1278 lies 52.3684395875, -41.2903073562, further north than either end.
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Geohash bounding box
The geohash 9q8yy decodes to a cell from 37.749023438 to 37.79296875 latitude and -122.431640625 to -122.387695312 longitude, centred on 37.770996094…
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Geohash neighbors finder
Enter one geohash and get the eight cells around it, from north round to northwest: u4pruyd has u4pruyf to its north and u4pruye to its east, all with the same…
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Web map scale calculator
Turn a web map's zoom level, latitude and screen DPI into its 1:N scale: zoom 10 at latitude 40.7128 on a 96 DPI screen gives 1:437960, the figure for a scale…
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Web Mercator meters per pixel
Find how many metres of ground one pixel covers on a Web Mercator map: at zoom 12 on the equator it is 38.2185141426 m, halving with each zoom step and…
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Lat lon to MGRS
Enter 38.8895, -77.0353 and get the MGRS reference 18SUJ2347806483, ready for a topographic map, a land-navigation drill or a radio brief.
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MGRS to lat/lon
Paste 18SUJ2348306479 and get 38.88946279, -77.0352420237: the south-west corner of that 1 m square in WGS84 degrees, together with its UTM zone, band and…
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Point in polygon checker
The point (1, 1) lies inside the rectangle with corners (0, 0), (4, 0), (4, 3) and (0, 3): a ray cast to the right crosses its outline once, and an odd count…
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Polygon centroid calculator
For a ring with corners at latitude 0 to 3 and longitude 0 to 4, the area-weighted centre is 1.5, 2: the balance point of the whole shape, not simply the mean…
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Bing Maps quadkey decoder
Turn a Bing Maps quadkey back into the tile it names: 213 is column 3, row 5 at zoom 3, ready to use as the path 3/3/5.
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Tile to Bing Maps quadkey
Get the Bing Maps quadkey for any tile: column 3, row 5 at zoom 3 gives 213, the same digits that real tile addresses and cache keys use.
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Rhumb line bearing calculator
Get the one compass course to hold between two points along a rhumb line: from 51.127, 1.338 to 50.964, 1.853 it is 116.72186°, or ESE.
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Rhumb line destination point
Find the arrival point when you hold one compass course: 10 km at 45° from 51.4778, -0.0015 ends at 51.5413916406, 0.100674380088.
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Lat/lon to map tile
Find which web map tile contains a point: 51.5074, -0.1278 at zoom 12 falls in tile 12/2046/1362, column 2046 and row 1362.
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Lat lon to UTM converter
Latitude 40.7128 and longitude -74.006, in New York, become zone 18N with easting 583959.372 m and northing 4507350.998 m, EPSG 32618.
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Vincenty distance calculator
From 50.06638889, -5.71472222 to 58.64388889, -3.07 the ellipsoidal distance is 969.9329875586 km, leaving on a bearing of 9.1423286009°.
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Web Mercator unproject
X 0 and Y 0 metres on the Web Mercator plane come back as latitude 0° and longitude 0°, where the equator meets Greenwich.
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Arrival local time calculator
Leave at 14:30 from UTC−5, fly 8 hours to UTC+0, and you land at 03:30 the next day. Enter the departure clock, flight length and both UTC offsets to see the…
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Average speed calculator
Covering 120,000 metres in 7,200 seconds, every stop included, is an average of 60 km/h. Enter the path distance and the total elapsed time to get the overall…
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Travel points value calculator
A 400 fare that costs 40,000 points as an award gives 1 cent per point, 0.5 below a 1.5-cent baseline, so paying cash may be wiser.
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Cycling time estimator
40 km at an average of 20 km/h is 2 hours on the bike: the estimator divides distance by average speed and shows the result in hours, in minutes and as an…
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