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
Return loss to SWR calculator for antenna tuning
POST /elec/return-loss-to-swr$0.002Developer Utilities
Spherical law of cosines distance calculator
POST /geo/law-of-cosines-distance$0.002Developer Utilities
Nearest point on a great-circle segment
spherical calculator
POST /geo/nearest-point-on-segment$0.002Developer Utilities
Earth arc length from central angle calculator
POST /geo/arc-length-from-angle$0.002Developer Utilities
Geodesic segment length calculator
latitude and longitude
POST /geo/segment-length$0.002Developer Utilities
True to magnetic bearing calculator
subtract declination
POST /geo/true-to-magnetic$0.002Developer Utilities
Convex Hull Perimeter Calculator for Cartesian Points
POST /geo/convex-hull-perimeter$0.002Developer Utilities
Geodesic polygon area calculator on the WGS84 ellipsoid
POST /geo/geodesic-polygon-area$0.002Developer Utilities
Polygon interior angles from ordered vertices
POST /geo/polygon-interior-angles$0.002Developer Utilities
Spherical triangle area calculator from latitude and longitude
POST /geo/triangle-geodesic-area$0.002Developer Utilities
Degrees decimal minutes to DMS converter
split DDM into seconds
POST /geo/ddm-to-dms$0.002Developer Utilities
Normalize bearing to 0–360 degrees
POST /geo/normalize-bearing$0.002Developer Utilities
UTM zone number from longitude
Norway and Svalbard exceptions
POST /geo/utm-zone-from-lon$0.002Developer Utilities
Approximate H3 hex index
map coordinates to a hex cell
POST /geo/h3-cell-approx$0.002Developer Utilities
Recover a shortened Plus Code from nearby coordinates
POST /geo/plus-code-recover$0.002Developer Utilities
Quadkey to Tile XYZ Converter
Decode X, Y and Zoom
POST /geo/quadkey-to-tile$0.002Developer Utilities
Three meter grid index
numeric address from latitude and longitude
POST /geo/what3words-grid-index$0.002Developer Utilities
Miller cylindrical projection calculator for latitude and longitude
POST /geo/miller-project$0.002Developer Utilities
Stereographic projection calculator
latitude/longitude to X/Y
POST /geo/stereographic-project$0.002Developer Utilities
ECEF to local ENU converter
east, north, up coordinates
POST /geo/ecef-to-enu$0.002Developer Utilities
Lambert azimuthal equal-area projection calculator
POST /geo/lambert-azimuthal$0.002Developer Utilities
Course Over Ground from Vectors
COG and SOG Calculator
POST /geo/course-over-ground$0.002Developer Utilities
Equal Time Point Calculator for Flight Planning
POST /geo/equal-time-point$0.002Developer Utilities
Travel time from distance and speed calculator
POST /geo/travel-time$0.002Developer Utilities
Descent Gradient and Top of Descent Calculator
POST /geo/descent-gradient$0.002Developer Utilities
Dogleg route distance calculator
waypoint detour penalty
POST /geo/dogleg-distance$0.002Developer Utilities
Three-dimensional distance
ground distance and elevation calculator
POST /geo/distance-3d$0.002Developer Utilities
Horizon dip angle calculator from observer height
POST /geo/horizon-dip-angle$0.002Developer Utilities
Turn anticipation distance calculator
radius and course change
POST /geo/turn-anticipation-distance$0.002Developer Utilities
Distance from Angle and Height Calculator
POST /geo/distance-from-angle-height$0.002Developer Utilities
Vertical exaggeration factor calculator for terrain profiles
POST /geo/vertical-exaggeration$0.002Developer Utilities
Viewshed point visibility test over a terrain profile
POST /geo/viewshed-point-test$0.002Developer Utilities
Fishnet grid from bounding box
generate regular cell bounds
POST /geo/grid-from-bbox$0.002Developer Utilities
Total pairwise distance calculator for latitude and longitude points
POST /geo/total-pairwise-distance$0.002Developer Utilities
Great-circle equator crossing longitude and bearing calculator
POST /geo/great-circle-equator-crossing$0.002Developer Utilities
Isometric latitude calculator
ellipsoidal Mercator coordinate
POST /geo/isometric-latitude$0.002Developer Utilities
Geometric median calculator
find the median center of points
POST /geo/median-center$0.002Developer Utilities
Snap a latitude and longitude coordinate to a grid
POST /geo/snap-to-grid$0.002Developer Utilities
16-point compass to bearing
direction name to degrees
POST /geo/cardinal16-to-bearing$0.002Developer Utilities
Eckert VI projection calculator
latitude and longitude to x, y
POST /geo/eckert-vi-project$0.002Developer Utilities
Frequency from angular frequency calculator
ω to Hz
POST /optics/frequency-from-angular-frequency$0.002Developer Utilities
Transverse wave maximum particle acceleration calculator
POST /optics/transverse-max-particle-acceleration$0.002Developer Utilities
Closed pipe harmonic frequency calculator
odd harmonics
POST /optics/closed-pipe-harmonic$0.002Developer Utilities
Standing Wave Nodes Count Calculator for Fixed Ends
POST /optics/standing-wave-nodes-count$0.002Developer Utilities
Wave Power Transmittance Calculator from Impedances
POST /optics/wave-power-transmittance$0.002Developer Utilities
Wavelength from frequency and wave speed calculator
POST /optics/wavelength-from-frequency-speed$0.002Developer Utilities
Sound intensity level calculator
10 log10(I/I0)
POST /optics/sound-intensity-level-from-intensity$0.002Developer Utilities
Sound Power from Intensity and Area Calculator
P = I × A
POST /optics/sound-power-from-intensity$0.002Developer Utilities
Speed of sound in solid calculator
Young modulus and density
POST /optics/speed-of-sound-in-solid$0.002Developer Utilities
String harmonic series list calculator from fundamental frequency
POST /optics/string-harmonic-series-list$0.002Developer Utilities
Acoustic pressure from intensity calculator
RMS plane-wave pressure
POST /optics/acoustic-pressure-from-intensity$0.002Developer Utilities
Sabine Reverberation Time Calculator
Calculate RT60
POST /optics/sabine-reverberation-time$0.002Developer Utilities
Direct proportion calculator
find the constant and matching value
POST /algebra/direct-proportion$0.002Developer Utilities
Frequency to MIDI note number calculator
convert hertz to MIDI
POST /optics/frequency-to-midi-note$0.002Developer Utilities
Room Volume from Reverberation Time Calculator
Inverted Sabine Equation
POST /optics/room-volume-from-rt60$0.002Developer Utilities
Equal temperament note frequency calculator
semitone offset to Hz
POST /optics/equal-temperament-frequency$0.002Developer Utilities
Thin lens image distance calculator
solve image distance
POST /optics/image-distance-thin-lens$0.002Developer Utilities
Telescope exit pupil calculator
aperture divided by magnification
POST /optics/telescope-exit-pupil$0.002Developer Utilities
Thick lens focal length calculator
index, radii and thickness
POST /optics/thick-lens-focal-length$0.002Developer Utilities
Two-lens system image position calculator
POST /optics/two-lens-system-image$0.002