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
Decagon area from apothem
regular decagon area calculator
POST /geom/decagon-area-apothem$0.002Developer Utilities
Decagon circumradius calculator
radius from side length
POST /geom/decagon-circumradius$0.002Developer Utilities
Decagon perimeter calculator
regular decagon P = 10 × side
POST /geom/decagon-perimeter$0.002Developer Utilities
Decagonal prism calculator
volume and surface from side and height
POST /geom/decagonal-prism$0.002Developer Utilities
Distance between two points in 3D
Euclidean calculator, free
POST /geom/distance-3d$0.002Developer Utilities
Dodecagon area calculator
regular 12-gon from side length, free
POST /geom/dodecagon-area$0.002Developer Utilities
Dodecagon area from apothem
regular dodecagon area calculator
POST /geom/dodecagon-area-apothem$0.002Developer Utilities
Dodecagon circumradius calculator
regular 12-gon from side length, free
POST /geom/dodecagon-circumradius$0.002Developer Utilities
Dodecagon perimeter calculator
regular dodecagon P = 12 × side
POST /geom/dodecagon-perimeter$0.002Developer Utilities
Dodecahedron inradius calculator
inscribed sphere radius from edge length
POST /geom/dodecahedron-inradius$0.002Developer Utilities
Dodecahedron midradius calculator
midsphere radius from edge length
POST /geom/dodecahedron-midradius$0.002Developer Utilities
Dodecahedron surface area calculator
total surface from edge length free
POST /geom/dodecahedron-surface$0.002Developer Utilities
Ellipse area calculator
A = πab from semi-axes free online
POST /geom/ellipse-area$0.002Developer Utilities
Ellipse directrix calculator
distance from center via semi-axes
POST /geom/ellipse-directrix$0.002Developer Utilities
Ellipse foci calculator
focal distance and foci from semi-axes
POST /geom/ellipse-foci$0.002Developer Utilities
Ellipse latus rectum calculator
semi-latus rectum and L from semi-axes
POST /geom/ellipse-latus-rectum$0.002Developer Utilities
Ellipse perimeter calculator
Ramanujan first approximation from semi-axes
POST /geom/ellipse-perimeter-ramanujan$0.002Developer Utilities
Ellipse circumference
Ramanujan's second approximation free
POST /geom/ellipse-perimeter-ramanujan2$0.002Developer Utilities
Ellipse segment area calculator
area from semi-axes and cut line
POST /geom/ellipse-segment-area$0.002Developer Utilities
Ellipse general to standard form calculator
center, semi-axes, equation
POST /geom/ellipse-standard-form$0.002Developer Utilities
Ellipsoid semi-axis from volume calculator
third axis from V, a, b
POST /geom/ellipsoid-axis-volume$0.002Developer Utilities
Ellipsoid surface area calculator
approximate area from three semi-axes
POST /geom/ellipsoid-surface$0.002Developer Utilities
Equilateral triangle area from side calculator
free
POST /geom/equilateral-area$0.002Developer Utilities
External tangent length calculator
two circles radii and distance
POST /geom/external-tangent-two-circles$0.002Developer Utilities
Foot of perpendicular calculator
point to line ax+by+c=0
POST /geom/foot-of-perpendicular$0.002Developer Utilities
Conical frustum slant height calculator
two radii and height
POST /geom/frustum-slant-height$0.002Developer Utilities
Hendecagon apothem calculator
inradius from side length
POST /geom/hendecagon-apothem$0.002Developer Utilities
Hendecagon area calculator
regular 11-gon from side length, free
POST /geom/hendecagon-area$0.002Developer Utilities
Hendecagon area from apothem
regular hendecagon area calculator
POST /geom/hendecagon-area-apothem$0.002Developer Utilities
Heptagon area calculator
regular heptagon from side length, free
POST /geom/heptagon-area$0.002Developer Utilities
Heptagon area from apothem calculator
regular 7-gon, free
POST /geom/heptagon-area-apothem$0.002Developer Utilities
Heptagon circumradius calculator
regular heptagon from side length, free
POST /geom/heptagon-circumradius$0.002Developer Utilities
Heptagon perimeter calculator
P = 7 × side for a regular heptagon
POST /geom/heptagon-perimeter$0.002Developer Utilities
Hexagon apothem calculator
inradius from side length
POST /geom/hexagon-apothem$0.002Developer Utilities
Hexagon area calculator
regular hexagon from side length, free
POST /geom/hexagon-area$0.002Developer Utilities
Hexagon area from apothem
regular hexagon area calculator
POST /geom/hexagon-area-apothem$0.002Developer Utilities
Hexagonal antiprism calculator
volume and surface area from edge length
POST /geom/hexagonal-antiprism$0.002Developer Utilities
Hexagonal bipyramid calculator
volume and surface area
POST /geom/hexagonal-bipyramid$0.002Developer Utilities
Hollow cylinder volume calculator
material from radii and height
POST /geom/hollow-cylinder$0.002Developer Utilities
Homothety dilation calculator
image of a point from center and ratio
POST /geom/homothety$0.002Developer Utilities
Hyperbola asymptotes calculator
slopes ±b/a from semi-axes
POST /geom/hyperbola-asymptotes$0.002Developer Utilities
Hyperbola latus rectum calculator
length from semi-axes a and b
POST /geom/hyperbola-latus-rectum$0.002Developer Utilities
Hyperbola vertices and directrix calculator
from semi-axes a and b
POST /geom/hyperbola-vertices$0.002Developer Utilities
Icosahedron circumradius calculator
sphere from edge length
POST /geom/icosahedron-circumradius$0.002Developer Utilities
Icosahedron midradius calculator
midsphere radius from edge length
POST /geom/icosahedron-midradius$0.002Developer Utilities
Icosahedron surface area calculator
S = 5√3 a² from edge length
POST /geom/icosahedron-surface$0.002Developer Utilities
Icosidodecahedron calculator
volume and surface area from edge length
POST /geom/icosidodecahedron$0.002Developer Utilities
Internal tangent length calculator
two circles from radii and distance
POST /geom/internal-tangent-two-circles$0.002Developer Utilities
Kite area calculator
A = (d1 × d2) / 2 from two diagonals
POST /geom/kite-area$0.002Developer Utilities
Kite perimeter calculator
P = 2(a + b) from two side lengths
POST /geom/kite-perimeter$0.002Developer Utilities
Line from intercepts calculator
intercept form x/a + y/b = 1
POST /geom/line-from-intercepts$0.002Developer Utilities
Line plane intersection calculator
find where a 3D line meets a plane
POST /geom/line-plane-intersection$0.002Developer Utilities
Line standard form converter
slope and intercept to Ax+By=C
POST /geom/line-standard-form$0.002Developer Utilities
Lune area calculator
circular lune from two radii and distance
POST /geom/lune-area$0.002Developer Utilities
Lune of Hippocrates calculator
area equals the right triangle
POST /geom/lune-hippocrates$0.002Developer Utilities
Manhattan distance calculator
taxicab L1 between two points, free
POST /geom/manhattan-distance$0.002Developer Utilities
Medial triangle calculator
midpoints, vertices, and area
POST /geom/medial-triangle$0.002Developer Utilities
Napkin ring volume calculator
spherical band volume from height only
POST /geom/napkin-ring$0.002Developer Utilities
Nine-point circle calculator
center and radius from three vertices
POST /geom/nine-point-circle$0.002Developer Utilities
Nonagon apothem calculator
regular 9-gon from side length, free
POST /geom/nonagon-apothem$0.002