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.
Isometric latitude calculator
Convert a geodetic latitude into the isometric latitude behind the ellipsoidal Mercator projection: 45° gives 0.876634653434599 radians on WGS-84, with the…
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Geometric median calculator
Find the point with the smallest total straight-line distance to all your points; for (0, 0), (4, 0) and (2, 3) the geometric median lands at x 2, y…
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Snap a latitude and longitude coordinate to a grid
Round a coordinate to a fixed grid in one step: with a spacing of 0.01°, the point 37.7749, -122.4194 snaps to 37.77, -122.42, with grid indexes 3777 and…
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16-point compass to bearing
North-Northeast is 22.5°, East-Northeast 67.5° and North-Northwest 337.5°: type any of the 16 standard directions, in full or abbreviated, and get its exact…
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Eckert VI projection calculator
The point 40.7128, -74.006 on a sphere of 6371008.8 m lands at x -11792757.531 and y 5035021.826 on the Eckert VI world map, with an auxiliary angle of 51.337°.
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Multi-day drive days calculator
1,800 miles at no more than 400 a day takes 5 driving days and 4 hotel nights, with 200 miles left for the last morning.
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Two-leg trip time calculator
Drive 180 km at 90 km/h, then 30 km at 30 km/h, and the trip takes 3 hours with a combined average of 70 km/h, not the 60 you get by averaging the speeds.
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Annual fuel cost calculator
Driving 12,000 miles a year at 28 mpg with fuel at 3.50 a gallon costs 1,500 a year, 125 a month. Enter your yearly mileage, fuel economy and pump price to see…
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Car depreciation by year calculator
At 15% a year, a car keeps 85% of its price after the first year and 44.37% after five, because each year's loss is taken from what is left.
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EV cost per mile calculator
280 Wh per mile is 0.28 kWh per mile, or 28 kWh per 100 miles: multiply by your electricity price and you get the energy cost of every mile and every kilometre…
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Flight fuel reserve calculator
Burning 12 gallons an hour on a 2.5-hour trip, with a 0.5-hour alternate, a 45-minute reserve and 5 % contingency, you need 46.5 gallons on board.
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Gear ratio speed spread calculator
At 3000 rpm, a six-speed box with a 3.5 first gear, a 0.7 top gear, a 3.73 final drive and a 650 mm tire shows its speed in every gear and an overall spread of…
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Aviation oxygen duration calculator
A 600-litre bottle at 1,500 of 1,800 psi holds 500 usable litres, enough for 125 minutes when two people each breathe 2 litres per minute.
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Takeoff ground-roll calculator
Start from a 1,000 ft sea-level ground roll charted at a 2,400 lb reference weight and correct it for density altitude, actual weight, headwind and runway…
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Tide time for depth calculator
With high water at 5 and low water at 1.4, a target of 3.2 is reached 3 hours after high water on the falling tide, exactly half the 3.6 range.
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Wind pressure on sail calculator
20 knots on 30 m² of sail, square to the wind, push with about 1945 N, a little under 200 kgf. Add the height of the centre of effort and you also get the…
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Time difference between cities calculator
At 15:00 in New York (UTC−5) it is 05:00 the next day in Tokyo (UTC+9), a 14-hour difference. Type both cities, their UTC offsets and the local time to plan a…
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Trip nights and days calculator
Check in on Friday 12 July 2024 and check out on Monday 15 July and you pay for 3 nights while the trip spans 4 calendar days.
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Aerodynamic drag power calculator
At 100 km/h, a car with 2.2 m² of frontal area and a drag coefficient of 0.28 needs about 8 kW just to push the air aside; the calculator also shows the drag…
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Hydroplaning speed calculator
At 35 psi of cold tire pressure, the classic NASA estimate puts the start of hydroplaning at about 61.2 mph, or 98.6 km/h.
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Cabin altitude from pressure calculator
At 35,000 feet with 8 psi of cabin differential, the cabin sits between 6,500 and 7,000 feet, inside the usual 8,000-foot planning limit.
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Metric to inch tire size converter
A 265/75R16 tire stands 31.65 inches tall and 10.43 inches wide on a 16-inch rim, so its flotation code is 31.65x10.43R16.
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Cross-currency rate calculator
With 0.92 euros and 150 yen to the dollar, one euro buys about 163 yen: the calculator divides one quote by the other and also gives the inverse, so a trip…
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Wind-shear gradient calculator
10 knots at 50 ft and 35 knots at 2000 ft mean a shear of about 12.8 knots per 1000 ft, classed as strong.
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Itinerary time budget calculator
A 14-hour day with 2 hours of transit and 2 of rest leaves 10 hours for activities, so a museum, market, park and dinner walk totalling 7.5 hours fit with 2.5…
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Azimuth calculator
From London to Paris the initial bearing is 148.115617°, measured clockwise from true north. Enter the coordinates of the start and the destination in decimal…
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Latitude longitude distance
Turn two latitude and longitude pins into a single figure in kilometres: 40.7128, -74.006 and 51.5074, -0.1278 lie 5570.22218 km apart along the great circle, a…
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Wind chill calculator
See how cold the wind makes the air feel on bare skin: −10 °C with a 20 km/h wind feels nearly 8 degrees colder, worked out with the 2001 metric formula used by…
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