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
Cylinder volume calculator
lateral and total surface area from radius and height
POST /geom/cylinder$0.002Developer Utilities
Distance between two points
Euclidean 2D calculator, free
POST /geom/distance-2d$0.002Developer Utilities
Ellipsoid volume calculator
surface area by Knud Thomsen from three semi-axes
POST /geom/ellipsoid$0.002Developer Utilities
Conical frustum calculator
volume, slant height and surface area from two radii and height
POST /geom/frustum-cone$0.002Developer Utilities
Pyramid frustum calculator
volume from two base areas and height, free
POST /geom/frustum-pyramid$0.002Developer Utilities
Hemisphere calculator
volume, curved and total surface area, free
POST /geom/hemisphere$0.002Developer Utilities
Heron's formula calculator
triangle area from three side lengths
POST /geom/heron-area$0.002Developer Utilities
Hexagonal pyramid calculator
volume and surface area from edge and height, free
POST /geom/hexagonal-pyramid$0.002Developer Utilities
Hyperbola calculator
foci, vertices, eccentricity, asymptote slopes
POST /geom/hyperbola$0.002Developer Utilities
Icosahedron calculator
volume and surface area from edge length, free
POST /geom/icosahedron$0.002Developer Utilities
Line equation from two points
slope-intercept and standard form, free
POST /geom/line-equation$0.002Developer Utilities
Midpoint calculator
center of a segment between two points
POST /geom/midpoint$0.002Developer Utilities
Oblique prism volume
Cavalieri from base area and perpendicular height
POST /geom/oblique-prism$0.002Developer Utilities
Octahedron calculator
volume, surface area, inradius and circumradius from edge
POST /geom/octahedron$0.002Developer Utilities
Parabola calculator
vertex, focus, directrix and axis, free
POST /geom/parabola$0.002Developer Utilities
Paraboloid volume calculator
volume of revolution from base radius and height
POST /geom/paraboloid$0.002Developer Utilities
Parallel or perpendicular lines
slopes, relation and angle
POST /geom/parallel-perpendicular$0.002Developer Utilities
Pentagonal prism calculator
volume and surface area from base edge and height
POST /geom/pentagonal-prism$0.002Developer Utilities
Point to line distance
perpendicular distance to ax+by+c=0
POST /geom/point-line-distance$0.002Developer Utilities
Polygon diagonals calculator
n(n−3)/2 for convex n-gons
POST /geom/polygon-diagonals$0.002Developer Utilities
Polygon perimeter from coordinates
sum edge lengths, free
POST /geom/polygon-perimeter$0.002Developer Utilities
Quadrilateral area calculator
shoelace formula from four vertices
POST /geom/quadrilateral-area$0.002Developer Utilities
Rectangular prism calculator
volume, surface area, diagonal, free
POST /geom/rectangular-prism$0.002Developer Utilities
Regular polygon calculator
area, perimeter, apothem, radius
POST /geom/regular-polygon$0.002Developer Utilities
Right triangle calculator
missing side, angles and area
POST /geom/right-triangle$0.002Developer Utilities
Section formula calculator
divide a segment in ratio m:n, free
POST /geom/section-formula$0.002Developer Utilities
Circular sector area and perimeter
radius and angle, free
POST /geom/sector-area$0.002Developer Utilities
Circular segment area
from radius and central angle
POST /geom/segment-area$0.002Developer Utilities
Sphere volume calculator
volume and surface area from radius or diameter
POST /geom/sphere-volume$0.002Developer Utilities
Spherical cap calculator
volume and curved surface area, free
POST /geom/spherical-cap$0.002Developer Utilities
Spherical sector calculator
volume and surface area from radius and cap height
POST /geom/spherical-sector$0.002Developer Utilities
Tank volume calculator
filled and total volume of horizontal or vertical cylindrical tanks
POST /geom/tank-volume$0.002Developer Utilities
Tetrahedron volume calculator
surface area, height and insphere from edge length
POST /geom/tetrahedron$0.002Developer Utilities
Trapezoid area calculator
bases, height, midsegment, free
POST /geom/trapezoid$0.002Developer Utilities
30-60-90 triangle calculator
sides and area from any one side
POST /geom/triangle-30-60-90$0.002Developer Utilities
AAS triangle calculator
two angles and a non-included side
POST /geom/triangle-aas$0.002Developer Utilities
Triangle area from coordinates
shoelace formula, free
POST /geom/triangle-area-coordinates$0.002Developer Utilities
ASA triangle calculator
two angles and included side, free
POST /geom/triangle-asa$0.002Developer Utilities
Triangle centroid calculator
average of three vertices
POST /geom/triangle-centroid$0.002Developer Utilities
Triangle orthocenter from coordinates
altitudes, free
POST /geom/triangle-orthocenter$0.002Developer Utilities
SAS triangle calculator
third side, area, angles from two sides and included angle
POST /geom/triangle-sas$0.002Developer Utilities
Triangular prism calculator
volume and surface area, free
POST /geom/triangular-prism$0.002Developer Utilities
Two circles intersection
find intersection points from centers and radii, free
POST /geom/two-circles-intersection$0.002Developer Utilities
Wedge volume calculator
rectangular wedge from base and two heights, free
POST /geom/wedge$0.002Developer Utilities
Anion gap calculator
serum AG and albumin correction, free
POST /health/anion-gap$0.002Developer Utilities
Blood pressure category calculator
ACC/AHA stages, free
POST /health/blood-pressure-category$0.002Developer Utilities
BMI Prime calculator
ratio to the 25 upper-normal threshold, free
POST /health/bmi-prime$0.002Developer Utilities
Harris-Benedict BMR calculator
basal metabolic rate from weight, height, age, sex
POST /health/bmr-harris-benedict$0.002Developer Utilities
Katch-McArdle BMR calculator
BMR from lean mass, free
POST /health/bmr-katch-mcardle$0.002Developer Utilities
Total body water calculator
Watson TBW volume and percentage, free
POST /health/body-water-percentage$0.002Developer Utilities
Body surface area Du Bois calculator
BSA from height and weight, free
POST /health/bsa-dubois$0.002Developer Utilities
Body surface area calculator
Mosteller formula BSA, free
POST /health/bsa-mosteller$0.002Developer Utilities
Calories burned calculator
MET, weight and duration, free estimate
POST /health/calories-burned$0.002Developer Utilities
Child and teen BMI calculator
BMI percentile and band, free
POST /health/child-bmi$0.002Developer Utilities
Corrected calcium calculator
albumin-adjusted serum calcium, free
POST /health/corrected-calcium$0.002Developer Utilities
Cycling calorie calculator
calories burned biking, free
POST /health/cycling-calories$0.002Developer Utilities
Fat-free mass index calculator
FFMI from weight, height and body fat, free
POST /health/fat-free-mass-index$0.002Developer Utilities
Daily fiber intake calculator
recommended grams from calories, free
POST /health/fiber-intake$0.002Developer Utilities
Mean arterial pressure calculator
MAP from systolic and diastolic, free
POST /health/mean-arterial-pressure$0.002Developer Utilities
Pack years calculator
cigarettes and years smoked, free
POST /health/pack-years$0.002