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🧭 Travel & geographyFree
Slippy tile bounding box
Get the full rectangle covered by any web map tile from its column, row and zoom: tile 0/0/0 spans the whole world, from -180° to 180° in longitude and from…
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🧭 Travel & geographyFree
Slippy map tiles covering a bounding box
List every map tile that covers a bounding box at the zoom you choose: the box from -74.02 to -73.98 longitude and 40.7 to 40.73 latitude needs 4 tiles at zoom…
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🧭 Travel & geographyFree
USNG grid to latitude and longitude
The reference 18S UJ 23483 06479 becomes latitude 38.88946739 and longitude -77.03523639, the centre of a 1 m cell.
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➗ MathFree
Cubic yards of a cylinder
Turn a round hole, column or tank measured in feet into cubic yards for ordering concrete, gravel or mulch: a radius of 2 ft and a height of 5 ft come to…
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➗ MathFree
Cuboid calculator
Enter a box's length, width and height and get both its volume and its total surface area: 3 by 4 by 5 gives a volume of 60 and a surface of 94.
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➗ MathFree
Cuboid volume calculator
Multiply length, width and height to get the space a box, room or crate encloses: 3 by 4 by 5 gives 60, in your unit cubed.
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➗ MathFree
Cycloid
Enter the radius of a rolling wheel and get the length of one cycloid arch, the area beneath it or any point on the curve: a radius of 2 gives an arch 16 long…
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🧭 Travel & geographyFree
ETA from distance and speed
150 km at a steady 60 km/h takes 2.5 hours, shown as 2 h 30 min. Enter the distance and the speed in matching units, such as miles and mph or nautical miles and…
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🧭 Travel & geographyFree
ECEF to geodetic converter
X 6378137, Y 0, Z 0 m is the point at 0° latitude, 0° longitude and 0 m height. Paste the XYZ metres from a GNSS receiver or a textbook and get geodetic…
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🧭 Travel & geographyFree
Grid declination offset calculator
Combine grid convergence and magnetic declination into every north correction at once: with 2.25° and 7.5° east, grid declination is 5.25°, and you add −5.25°…
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🧭 Travel & geographyFree
Point of no return calculator
With 5 hours of usable endurance, 120 knots out and 180 knots back, the point of no return is 360 nautical miles from the start: 3 hours outbound and 2 hours…
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🧭 Travel & geographyFree
Unit vector to latitude and longitude
A unit vector with z at 0.5 and equal x and y points to latitude 30°, longitude 45°: enter the three components and get the place on the sphere in degrees, with…
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🧭 Travel & geographyFree
Velocity made good to waypoint
At 8 knots on a course of 45° toward a mark bearing 30°, you close on it at 7.727407 knots. Enter speed, course and bearing in the same frame and see how much…
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🧭 Travel & geographyFree
Wind triangle solver
Flying a heading of 90° at 100 knots with 20 knots of wind from 0°, your track becomes 101.309932° and your ground speed 101.98039 knots.
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🧭 Travel & geographyFree
Glide distance from altitude
Find how far an aircraft can glide without power: 1000 metres above the field with a 10 to 1 glide ratio gives a still-air reach of 10 kilometres, also shown in…
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🧭 Travel & geographyFree
Great-circle vertex latitude calculator from point and bearing
Start at 51.4778° N, 0.0015° W on a bearing of 60° and find where your great circle turns back toward the equator: the latitude and longitude of its…
K
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🧭 Travel & geographyFree
Next waypoint ETA calculator
At 25 km/h on a 76° leg, a fix at 37.7749, -122.4194 is 13.43 km from the waypoint 37.8044, -122.2712 and gets there in about 32 min 14 s.
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🧭 Travel & geographyFree
Route total distance
Get the total length of a route through several GPS points, leg by leg: the three waypoints in the example add up to 327.98509 km, or 203.800486 miles, as the…
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🧭 Travel & geographyFree
Speed made good calculator
Work out how fast you really advanced between two position fixes: two points 5.314523 km apart and half an hour apart give 10.629047 km/h, or 5.739226 knots…
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🧭 Travel & geographyFree
Turn radius from speed, bank angle, or turn rate
At 120 knots with a 25° bank, a coordinated turn needs a radius of 833.3860599903 m, or 2734.206233564 ft.
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➗ MathFree
Cyclomatic complexity calculator
Count how many independent paths run through a function from three numbers on its control-flow graph: 9 edges, 8 nodes and 1 component give a complexity of 3…
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➗ MathFree
Cylinder circumference
Get the perimeter of a cylinder's round base from its radius or diameter, so a radius of 3 gives 18.849556.
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🧭 Travel & geographyFree
Slope angle to grade percentage calculator
A slope of about 5.71° is a 10% grade: 10 units of rise for every 100 units of horizontal run. Enter the angle in degrees, positive uphill or negative downhill…
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🧭 Travel & geographyFree
Contour interval from map scale and terrain relief
A 1:50,000 map of an area with 600 m of relief gets a 20 m contour interval, about 30 bands from lowest to highest point.
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🧭 Travel & geographyFree
Terrain line of sight calculator
Check whether a straight line of sight clears the terrain between observer and target: over the profile 100, 105, 120, 110 and 95 m with the eye 1.7 m up, the…
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🧭 Travel & geographyFree
Net elevation change
For the profile 100, 120, 110, 150, 140 m, the net change is 40 m, yet the route climbs 60 m in total and descends 20 m.
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🧭 Travel & geographyFree
Atmospheric refraction correction calculator for surveying
Remove the effect of atmospheric refraction from a surveyed vertical angle: a 1.25° sight over 5000 m is lowered by about twenty-one arcseconds, roughly half a…
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🧭 Travel & geographyFree
Slope degrees between two points
Find the slope angle between two points from run and rise: a run of 120 and a rise of 30 give a ratio of 0.25 and an angle of 14.036243°, uphill.
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🧭 Travel & geographyFree
Mutual visibility range
Find how far apart two raised objects can be and still see each other over the horizon: a 30 m lookout and a 100 m mast reach about 19.5 km and 35.7 km, so they…
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➗ MathFree
Cylinder diameter calculator
Find a cylinder's diameter from its volume and height. A volume of 1000 with a height of 10 gives a diameter of 11.2838 and a radius of 5.6419.
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➗ MathFree
Cylinder volume in gallons
Turn a cylinder measured in inches into US gallons: a radius of 6 inches and a height of 48 inches hold 23.500745 gallons.
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➗ MathFree
Cylinder volume in liters
Turn a cylinder measured in centimeters into liters: a radius of 10 cm and a height of 40 cm hold 12.566371 liters.
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🧭 Travel & geographyFree
Buffer radius bounding box calculator for latitude and longitude
A 1000 m buffer around 51.5074, −0.1278 becomes the four limits of the smallest latitude and longitude rectangle that encloses it, with flags for the…
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🧭 Travel & geographyFree
Point distance matrix
Enter up to 200 points and get every pairwise great-circle distance in kilometres in one table: three points give a 3 × 3 grid with zeros on the diagonal and…
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🧭 Travel & geographyFree
K nearest neighbor points
Rank a list of places by great-circle distance from one point and keep the closest k: from 40.4168, -3.7038, the nearest three of four candidates are…
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🧭 Travel & geographyFree
Mean center of points
Find the central point of a set of locations on the globe rather than averaging degrees on a flat grid: three sample points give a mean center at 40.4125978922…
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🧭 Travel & geographyFree
Standard distance of points
Score how compact a cloud of points is with one number: (0,0), (3,4) and (6,0) have their mean center at (3, 1.333333333333) and a standard distance of…
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🧭 Travel & geographyFree
Switchback count estimate
Estimate how many switchbacks a climb needs: 100 m of gain at a 10% maximum grade with 50 m legs means 20 legs and 19 switchbacks, each leg rising 5 m.
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➗ MathFree
Cylindrical coordinates converter
The point (3, 4, 5) becomes a radius of 5, an azimuth of about 0.9273 radians and a height of 5. The angle always lands in the right quadrant, even when x or y…
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➗ MathFree
Regular decagon
A regular decagon with a side of 4 encloses an area of 123.107341 square units. Choose the measurement you need: the area, the perimeter, the interior angle…
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🧭 Travel & geographyFree
Authalic latitude calculator
At 45° geodetic latitude on WGS 84, the authalic latitude is 44.8717028734°: the angle a sphere needs to keep the same area from the equator.
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🧭 Travel & geographyFree
Bounding box contains check
An outer box from (0, 0) to (10, 10) fully contains an inner box from (2, 3) to (5, 7): all four edges nest.
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🧭 Travel & geographyFree
Bounding box union
Two boxes, one from latitude 40.7 to 40.8 and one from 40.75 to 40.9, merge into a single box from 40.7 to 40.9, with longitudes from −74.1 to −73.85.
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🧭 Travel & geographyFree
Concave hull approximation from point coordinates
Five points with a threshold of 3 give a hull that dips inward to (2, 1), with 1 point inserted, an area of 14 and 3 edges still longer than the target.
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🧭 Travel & geographyFree
Round coordinate precision
Rounding 40.712812345, −74.006012345 to 4 decimals gives 40.7128, −74.006, a precision of about 11.132 m north to south.
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🧭 Travel & geographyFree
Circular geofence check
A point 6283.257836 m from the centre of a 10000 m geofence is inside, with 3716.742164 m to spare.
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🧭 Travel & geographyFree
Grid-based point clustering
Four coordinates on a 1° grid fall into three occupied cells, and the cell at latitude 40 to 41, longitude -74 to -73 holds two of them.
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🧭 Travel & geographyFree
Rectifying latitude calculator
Turn a geodetic latitude into its rectifying latitude on WGS-84: 45° becomes 44.855682294117°, the angle that makes the true distance from the equator behave…
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➗ MathFree
Decimal expansion of a fraction
1/3 comes back as 0.(3) and 1/7 as 0.(142857), with the repeating block in parentheses, while a fraction that ends, like 1/8, gives a clean 0.125.
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➗ MathFree
Decimal to degrees and minutes converter
40.7128° becomes 40° 42.768′: whole degrees plus minutes with decimals, stopping before seconds, the way aviation reports, marine waypoint lists and telescope…
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🧭 Travel & geographyFree
Behrmann Equal-Area Projection Calculator
New York (40.7128, −74.006) lands at an x and y in metres on the Behrmann map, a cylinder whose standard parallels sit at 30° north and south so every area…
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🧭 Travel & geographyFree
32-point compass to bearing
On the full 32-point rose, NNE sits at 22.5°, Southeast by East at 123.75° and North by West at 348.75°: every point is an exact multiple of 11.25°.
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🧭 Travel & geographyFree
Equidistant conic projection
With standard parallels at 33° and 45°, scale stays true along both parallels and along every meridian.
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🧭 Travel & geographyFree
Great-circle maximum latitude calculator using Clairaut's relation
With just a starting latitude and a bearing, see how far north and south a great circle reaches: a due-north course touches both poles at 90°, and an eastward…
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🧭 Travel & geographyFree
Polygon bounding box calculator
For vertices at 40.7128, -74.006, 34.0522, -118.2437 and 41.8781, -87.6298, the box runs from 34.0522, -118.2437 in the south-west to 41.8781, -74.006 in the…
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🧭 Travel & geographyFree
Meridian radius of curvature
Get the radius of curvature of the meridian at any latitude on WGS84: at 45° it is about 6,367,382 m, so one degree of latitude covers about 111.13 km there.
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🧭 Travel & geographyFree
Rhumb line midpoint calculator
Find the point halfway along a constant-bearing route: between 51.5074, -0.1278 and 40.7128, -74.006 it lies at 46.1101, -38.882455.
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➗ MathFree
Determinant calculator
The 2×2 matrix with rows (4, 3) and (6, 3) has a determinant of −6, so it can be inverted. Any square matrix up to 32×32 gets its determinant and a clear note…
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🧭 Travel & geographyFree
Distance off by two bearings
Take a bearing of 45° on a landmark, run 2 nautical miles, take 90°, and you were 2.828427124746 miles off at the first sight, 2 at the second and 2 when abeam.
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➗ MathFree
Diagonal of a rectangle
A rectangle 3 wide and 4 tall has a diagonal of exactly 5, worked out with the Pythagorean theorem and given in the unit you typed.
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3
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Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
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