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Hundreds of ready-made tasks — PDF, images, audio, OCR, text AI, scraping, data and more — behind a single REST API. Send a job, get a finished result by webhook. No servers, no per-model tokens, a price you can read.
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The full catalog
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⚙️ Developer UtilitiesFree
Octahedron surface area calculator
S = 2√3 a² from edge length
A
POST /geom/octahedron-surface$0.002⚙️ Developer UtilitiesFree
Parabola arc length calculator
length of y=ax² over an x-range
A
POST /geom/parabola-arc-length$0.002⚙️ Developer UtilitiesFree
Parabola from focus and directrix
equation, vertex and focal length
S
POST /geom/parabola-from-focus-directrix$0.002⚙️ Developer UtilitiesFree
Parabola vertex form calculator
convert ax²+bx+c to a(x−h)²+k
P
POST /geom/parabola-vertex-form$0.002⚙️ Developer UtilitiesFree
Parabolic segment area calculator
Archimedes formula from base and height
P
POST /geom/parabolic-segment-area$0.002⚙️ Developer UtilitiesFree
Parallelogram area calculator
area from base and height
P
POST /geom/parallelogram-area$0.002⚙️ Developer UtilitiesFree
Parallelogram area
A = a·b·sin(θ) from sides and included angle
A
POST /geom/parallelogram-area-angle$0.002⚙️ Developer UtilitiesFree
Parallelogram height calculator
height from area and base
P
POST /geom/parallelogram-height$0.002⚙️ Developer UtilitiesFree
Parallelogram perimeter calculator
P = 2(a + b) from adjacent sides
A
POST /geom/parallelogram-perimeter$0.002⚙️ Developer UtilitiesFree
Pentagon area calculator
regular pentagon area from side length
P
POST /geom/pentagon-area$0.002⚙️ Developer UtilitiesFree
Pentagon area from apothem
regular pentagon area calculator
P
POST /geom/pentagon-area-apothem$0.002⚙️ Developer UtilitiesFree
Pentagon circumradius calculator
regular pentagon from side length, free
A
POST /geom/pentagon-circumradius$0.002⚙️ Developer UtilitiesFree
Pentagon perimeter calculator
regular pentagon P = 5 × side
A
POST /geom/pentagon-perimeter$0.002⚙️ Developer UtilitiesFree
Pentagonal antiprism calculator
volume and surface area from edge length
P
POST /geom/pentagonal-antiprism$0.002⚙️ Developer UtilitiesFree
Pentagonal bipyramid calculator
volume and surface area from edge
A
POST /geom/pentagonal-bipyramid$0.002⚙️ Developer UtilitiesFree
Pentagram area calculator
five-pointed star from circumradius
P
POST /geom/pentagram-area$0.002⚙️ Developer UtilitiesFree
Perpendicular bisector calculator
equation from two endpoints
A
POST /geom/perpendicular-bisector$0.002⚙️ Developer UtilitiesFree
Point in triangle checker
is a point inside a triangle?
P
POST /geom/point-in-triangle$0.002⚙️ Developer UtilitiesFree
Point to plane distance calculator
perpendicular distance to ax+by+cz+d=0
P
POST /geom/point-plane-distance$0.002⚙️ Developer UtilitiesFree
Point-slope form calculator
equation from a point and slope
P
POST /geom/point-slope-form$0.002⚙️ Developer UtilitiesFree
Number of sides from interior angle calculator
regular polygon
P
POST /geom/polygon-sides-from-interior-angle$0.002⚙️ Developer UtilitiesFree
Sum of interior angles calculator
polygon (n−2)×180°
A
POST /geom/polygon-sum-interior-angles$0.002⚙️ Developer UtilitiesFree
Prism volume calculator
right prism volume from base area and height
P
POST /geom/prism-volume$0.002⚙️ Developer UtilitiesFree
Prolate spheroid calculator
volume and surface from a and c
P
POST /geom/prolate-spheroid$0.002⚙️ Developer UtilitiesFree
Pyramid lateral surface area
base perimeter and slant height
P
POST /geom/pyramid-lateral-area$0.002⚙️ Developer UtilitiesFree
Quadrilateral area from diagonals calculator
A = ½·d1·d2·sin(θ)
A
POST /geom/quadrilateral-area-diagonals$0.002⚙️ Developer UtilitiesFree
Quarter circle area calculator
area and arc from radius
A
POST /geom/quarter-circle$0.002⚙️ Developer UtilitiesFree
Rectangle area calculator
A = length × width, free
A
POST /geom/rectangle-area$0.002⚙️ Developer UtilitiesFree
Rectangle sides from area and ratio
length and width calculator
S
POST /geom/rectangle-from-area-ratio$0.002⚙️ Developer UtilitiesFree
Rectangle perimeter calculator
P = 2(L + W) from length and width
P
POST /geom/rectangle-perimeter$0.002⚙️ Developer UtilitiesFree
Reflect a point over the x-axis calculator
(x,y) to (x,-y)
P
POST /geom/reflect-point-x-axis$0.002⚙️ Developer UtilitiesFree
Reflect a point over the y-axis calculator
free coordinates
A
POST /geom/reflect-point-y-axis$0.002⚙️ Developer UtilitiesFree
Reflect a point over y=x calculator
swap coordinates
P
POST /geom/reflect-point-yx$0.002⚙️ Developer UtilitiesFree
Regular polygon central angle calculator
360°/n from sides
S
POST /geom/regular-polygon-central-angle$0.002⚙️ Developer UtilitiesFree
Regular polygon diagonal lengths
distinct diagonals from n and R
A
POST /geom/regular-polygon-diagonal$0.002⚙️ Developer UtilitiesFree
Rhombic triacontahedron calculator
volume and surface from edge
P
POST /geom/rhombic-triacontahedron$0.002⚙️ Developer UtilitiesFree
Rhombicosidodecahedron calculator
volume and surface from edge
S
POST /geom/rhombicosidodecahedron$0.002⚙️ Developer UtilitiesFree
Rhombicuboctahedron calculator
volume and surface area from edge length
A
POST /geom/rhombicuboctahedron$0.002⚙️ Developer UtilitiesFree
Rhombus area from diagonals calculator
A = (d1 × d2) / 2
A
POST /geom/rhombus-area-diagonals$0.002⚙️ Developer UtilitiesFree
Rhombus perimeter calculator
perimeter from side length
S
POST /geom/rhombus-perimeter$0.002⚙️ Developer UtilitiesFree
Rhombus side from diagonals calculator
side length from d1 and d2
P
POST /geom/rhombus-side-diagonals$0.002⚙️ Developer UtilitiesFree
Right triangle altitude
height to hypotenuse from two legs
A
POST /geom/right-triangle-altitude$0.002⚙️ Developer UtilitiesFree
Right triangle from two legs calculator
hypotenuse, area, angles
P
POST /geom/right-triangle-legs$0.002⚙️ Developer UtilitiesFree
Rose curve petal counter
petals from angular coefficient k
P
POST /geom/rose-curve-petals$0.002⚙️ Developer UtilitiesFree
Rotate a point around a center calculator
free 2D
A
POST /geom/rotate-point-center$0.002⚙️ Developer UtilitiesFree
Rotate a point around the origin calculator
free 2D
A
POST /geom/rotate-point-origin$0.002⚙️ Developer UtilitiesFree
Sagitta calculator
circular arc height from radius and half-angle
P
POST /geom/sagitta$0.002⚙️ Developer UtilitiesFree
Scale a point from the origin calculator
homothety P′ = k·P
P
POST /geom/scale-point$0.002⚙️ Developer UtilitiesFree
Circular sector centroid calculator
distance from center
P
POST /geom/sector-centroid$0.002⚙️ Developer UtilitiesFree
Circular sector perimeter calculator
two radii plus arc
A
POST /geom/sector-perimeter$0.002⚙️ Developer UtilitiesFree
Sector radius from area calculator
r from area and central angle
P
POST /geom/sector-radius-area$0.002⚙️ Developer UtilitiesFree
Circular segment chord calculator
length from radius and central angle
A
POST /geom/segment-chord$0.002⚙️ Developer UtilitiesFree
Circular segment height calculator
sagitta from radius and chord
A
POST /geom/segment-height$0.002⚙️ Developer UtilitiesFree
Do two segments intersect?
checker and intersection point from endpoints
S
POST /geom/segment-intersection$0.002⚙️ Developer UtilitiesFree
Segment trisection points calculator
two points that trisect a segment
P
POST /geom/segment-trisection$0.002⚙️ Developer UtilitiesFree
Semicircle area and perimeter calculator
from radius, free
A
POST /geom/semicircle$0.002⚙️ Developer UtilitiesFree
Slope-intercept form calculator
y=mx+b from two points, free
A
POST /geom/slope-intercept-form$0.002⚙️ Developer UtilitiesFree
Snub cube calculator
volume and surface area from edge length
A
POST /geom/snub-cube$0.002⚙️ Developer UtilitiesFree
Snub dodecahedron calculator
volume and surface area from edge length
P
POST /geom/snub-dodecahedron$0.002⚙️ Developer UtilitiesFree
Sphere diameter from volume calculator
derive diameter from V
A
POST /geom/sphere-diameter-volume$0.002No capabilities match your search.
How it works
1
Get your key
Create an account with your email and add balance when you need it. No subscription, no sales call.
2
Call the endpoint
One authenticated POST. The API returns a task_id immediately — copy-paste snippets in five languages on every page.
3
Collect the result
Receive a signed webhook the moment it's ready, or fetch a signed link. A failed task is never charged.
Pay only for what you use
No subscription. Free tools run in your browser; paid tasks draw from your balance, which never expires.
Free tools
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.
Pay-as-you-go
Per task
$0.002+
The full API — 7500+ capabilities — billed only for what you run, from $0.002 per call. No monthly fee.
Balance
$10.00+
Top up your balance and spend it across web, API and the app. It never expires.