Developer Utilities
Small developer utilities that save a trip to a random website. Encode and decode Base64, explain a regex, build UTM links, generate QR codes and vCards, and more — the everyday helpers. Free in your browser, and available by API when you need them in a script.
Developer Utilities
Geographic radians to degrees converter for coordinates
POST /geo/coordinate-radians-to-degrees$0.002Developer Utilities
Degrees decimal minutes to decimal degrees converter
POST /geo/ddm-to-decimal$0.002Developer Utilities
Planar polygon perimeter
projected easting/northing edge sum
POST /geo/polygon-perimeter-planar$0.002Developer Utilities
Wrap longitude to 0–360°
climate and ocean dataset convention, free
POST /geo/wrap-longitude-360$0.002Developer Utilities
UTM latitude band letter
C to X from latitude, free
POST /geo/utm-zone-letter$0.002Developer Utilities
Web Mercator ground resolution calculator
meters per pixel
POST /geo/web-mercator-ground-resolution$0.002Developer Utilities
Largest cube in a cylinder
edge and volume from radius and height
POST /math/cubic-in-cylinder$0.002Developer Utilities
Albers equal-area projection calculator
lat/lon to conic X/Y, free
POST /geo/albers-equal-area$0.002Developer Utilities
Geohash child cells
subdivide a geohash into 32 children
POST /geo/geohash-children$0.002Developer Utilities
Hammer projection calculator
latitude and longitude to x, y
POST /geo/hammer-project$0.002Developer Utilities
Point to hex grid cell
calculate axial column and row
POST /geo/hex-grid-cell$0.002Developer Utilities
Orthographic projection calculator
lat/lon to globe plane, free
POST /geo/orthographic-project$0.002Developer Utilities
Easting and northing to OSGB grid reference converter
POST /geo/osgb-grid-reference$0.002Developer Utilities
Plate Carrée projection calculator
latitude and longitude to x and y
POST /geo/plate-carree-project$0.002Developer Utilities
Shorten Plus Code
drop leading OLC digits near a reference location
POST /geo/plus-code-shorten$0.002Developer Utilities
S2 cube face from lat/lon
which spherical cube face holds a coordinate
POST /geo/s2-face-from-latlon$0.002Developer Utilities
Sinusoidal projection calculator
equal-area lat/lon to x,y, free
POST /geo/sinusoidal-project$0.002Developer Utilities
US State Plane zone finder
state, latitude, longitude, FIPS
POST /geo/state-plane-zone$0.002Developer Utilities
Slippy tile bounding box
min/max lat lon from XYZ zoom
POST /geo/tile-bounds$0.002Developer Utilities
Slippy map tiles covering a bounding box
list XYZ coordinates
POST /geo/tiles-in-bbox$0.002Developer Utilities
USNG grid to latitude and longitude
cell center converter
POST /geo/usng-to-latlon$0.002Developer Utilities
Cubic yards of a cylinder
volume from radius and height in feet
POST /math/cubic-yards-cylinder$0.002Developer Utilities
Cuboid calculator
volume and surface area, free
POST /math/cuboid$0.002Developer Utilities
Cuboid volume calculator
V = l × w × h, free
POST /math/cuboid-volume$0.002Developer Utilities
Cycloid
arc length, area under one arch and coordinates
POST /math/cycloid$0.002Developer Utilities
ETA from distance and speed
calculate travel duration
POST /geo/eta-from-speed$0.002Developer Utilities
ECEF to geodetic converter
XYZ to lat, lon, height (WGS84)
POST /geo/ecef-to-geodetic$0.002Developer Utilities
Grid declination offset calculator
grid, true and magnetic north
POST /geo/grid-to-geographic-offset$0.002Developer Utilities
Point of no return calculator
distance and flight time
POST /geo/point-of-no-return$0.002Developer Utilities
Unit vector to latitude and longitude
3D sphere converter
POST /geo/unit-vector-to-latlon$0.002Developer Utilities
Velocity made good to waypoint
VMG from speed and bearing
POST /geo/vmg-to-waypoint$0.002Developer Utilities
Wind triangle solver
heading, track, TAS, GS and wind
POST /geo/wind-triangle$0.002Developer Utilities
Glide distance from altitude
max range from L/D ratio, free
POST /geo/glide-distance$0.002Developer Utilities
Great-circle vertex latitude calculator from point and bearing
POST /geo/great-circle-vertex$0.002Developer Utilities
Next waypoint ETA calculator
distance and time remaining
POST /geo/next-waypoint-eta$0.002Developer Utilities
Route total distance
sum great-circle legs between waypoints
POST /geo/route-total-distance$0.002Developer Utilities
Speed made good calculator
SMG from two fixes and elapsed time
POST /geo/speed-made-good$0.002Developer Utilities
Turn radius from speed, bank angle, or turn rate
POST /geo/turn-radius$0.002Developer Utilities
Cyclomatic complexity calculator
M = E − N + 2P from graph counts
POST /math/cyclomatic-complexity$0.002Developer Utilities
Cylinder circumference
circular base perimeter from radius or diameter
POST /math/cylinder-circumference$0.002Developer Utilities
Slope angle to grade percentage calculator
POST /geo/angle-to-grade$0.002Developer Utilities
Contour interval from map scale and terrain relief
POST /geo/contour-interval$0.002Developer Utilities
Terrain line of sight calculator
clear LOS over a height profile
POST /geo/line-of-sight$0.002Developer Utilities
Net elevation change
total gain and loss along a profile
POST /geo/net-elevation-change$0.002Developer Utilities
Atmospheric refraction correction calculator for surveying
POST /geo/refraction-correction$0.002Developer Utilities
Slope degrees between two points
elevation angle calculator
POST /geo/slope-degrees-two-points$0.002Developer Utilities
Mutual visibility range
max line-of-sight from two heights, free
POST /geo/target-visibility-range$0.002Developer Utilities
Cylinder diameter calculator
from volume and height, free online
POST /math/cylinder-diameter$0.002Developer Utilities
Cylinder volume in gallons
from radius and height in inches
POST /math/cylinder-volume-gallons$0.002Developer Utilities
Cylinder volume in liters
from radius and height in centimeters
POST /math/cylinder-volume-liters$0.002Developer Utilities
Buffer radius bounding box calculator for latitude and longitude
POST /geo/buffer-bbox$0.002Developer Utilities
Point distance matrix
pairwise great-circle distances
POST /geo/distance-matrix$0.002Developer Utilities
K nearest neighbor points
great-circle distance lookup
POST /geo/k-nearest-neighbors$0.002Developer Utilities
Mean center of points
spherical average of lat/lon free
POST /geo/mean-center$0.002Developer Utilities
Standard distance of points
spatial std. dev. around mean center
POST /geo/standard-distance$0.002Developer Utilities
Switchback count estimate
climb elevation within a max grade
POST /geo/switchback-count$0.002Developer Utilities
Cylindrical coordinates converter
radius, azimuth and height
POST /math/cylindrical-coordinates$0.002Developer Utilities
Regular decagon
area, perimeter, interior angle and diagonal count
POST /math/decagon$0.002Developer Utilities
Authalic latitude calculator
geodetic to equal-area latitude
POST /geo/authalic-latitude$0.002Developer Utilities
Bounding box contains check
does one AABB fully contain another?
POST /geo/bbox-contains-bbox$0.002