ForHosting KIT
Free tools that work
right in your browser.
Calculators, converters, PDF, text, images and much more — each with its own page. Type your data and get the result right here, with no sign-up and without your data leaving your device. Need them in your own app? The same tools are available by API.
REST APILive
EmailLive
Webkit.forhosting.comLive
TelegramLive
iOS & AndroidBuilding
WhatsAppComing
7830tools
7432free in your browser
8languages
6channels
Find your tool
Search in your own words or filter by category.
➗ MathFree
Rhombus perimeter calculator
Enter one side and get the perimeter of the rhombus: a side of 5 gives a perimeter of 20, because all four sides are equal.
S
Runs in your browser
➗ MathFree
Rhombus side from diagonals calculator
Enter the two diagonals of a rhombus and get its side: diagonals of 6 and 8 give a side of 5, because the half-diagonals form a right triangle.
P
Runs in your browser
➗ MathFree
Right triangle altitude
Enter the two legs of a right triangle and get the altitude from the right angle to the hypotenuse: legs of 3 and 4 give an altitude of 2.4, along with the…
A
Runs in your browser
➗ MathFree
Right triangle from two legs calculator
Two legs are all it takes: legs of 3 and 4 give a hypotenuse of 5, an area of 6 and the acute angle opposite each leg, in degrees.
P
Runs in your browser
➗ MathFree
Rose curve petal counter
Enter the coefficient k of a polar rose and get its petal count: k equal to 3 gives 3 petals, while k equal to 4 gives 8, because even values double the loops.
P
Runs in your browser
➗ MathFree
Rotate a point around a center calculator
Turn a point around any pivot you choose: rotating (4, 2) by 90 degrees about (1, 1) lands it at (0, 4).
A
Runs in your browser
➗ MathFree
Rotate a point around the origin calculator
Spin a point about the origin by any angle in degrees: (1, 0) turned 90 degrees becomes (0, 1). Positive angles go counterclockwise, the textbook convention…
A
Runs in your browser
➗ MathFree
Sagitta calculator
Get the rise of a circular arc from its radius and half-angle: a radius of 10 with a half-angle of 30 degrees gives a sagitta of about 1.34, a chord of 10 and a…
P
Runs in your browser
➗ MathFree
Scale a point from the origin calculator
Multiply a point's coordinates by a scale factor from the origin: (3, 4) scaled by 2 becomes (6, 8), and its distance from the origin grows from 5 to 10.
P
Runs in your browser
➗ MathFree
Circular sector centroid calculator
Find where a pie-slice shape balances: for a quarter circle of radius 5, the centroid sits just over 3 units from the center, out along the bisector of the…
P
Runs in your browser
➗ MathFree
Circular sector perimeter calculator
Measure the full outline of a pie slice: a radius of 5 at 90 degrees gives an arc of 5π/2 and a perimeter of 10 plus that arc, since both straight sides count.
A
Runs in your browser
➗ MathFree
Sector radius from area calculator
Work backwards from a slice's area to its circle: an area of about 19.63 with a 90-degree angle gives a radius of 5, plus an arc of 5π/2 and the full perimeter.
P
Runs in your browser
➗ MathFree
Circular segment chord calculator
Get the straight base of a circular segment from the radius and central angle: a radius of 10 at 90 degrees gives a chord of 10√2, together with the half-chord…
A
Runs in your browser
➗ MathFree
Circular segment height calculator
Turn a radius and a chord into the height of the arc above it: a radius of 5 and a chord of 6 give a height of 1, because the chord sits 4 from the center.
A
Runs in your browser
➗ MathFree
Do two segments intersect?
Check whether two finite segments really meet: the segments from (0, 0) to (4, 4) and from (0, 4) to (4, 0) cross at (2, 2), halfway along each.
S
Runs in your browser
➗ MathFree
Segment trisection points calculator
Split a segment into three equal pieces in one step: from (0, 0) to (6, 0), the trisection points are (2, 0) and (4, 0), and the full length is 6.
P
Runs in your browser
➗ MathFree
Semicircle area and perimeter calculator
Enter a radius and get both measures of a half disk: a radius of 1 gives an area of half π and a perimeter of π plus 2, because the flat diameter is part of the…
A
Runs in your browser
➗ MathFree
Slope-intercept form calculator
Give two points and get the line's equation in slope-intercept form: (0, 3) and (2, 7) give a slope of 2 and an intercept of 3, so y equals 2x plus 3.
A
Runs in your browser
➗ MathFree
Snub cube calculator
Enter one edge length and get the volume and total surface of a snub cube: an edge of 1 gives a volume of about 7.889 and a surface of about 19.856.
A
Runs in your browser
➗ MathFree
Snub dodecahedron calculator
Enter one edge length and get the size of a snub dodecahedron: an edge of 1 gives a volume of about 37.6167 and a surface of about 55.2867, spread over 92…
P
Runs in your browser
➗ MathFree
Sphere diameter from volume calculator
Start from the volume a sphere holds and get its width: the volume of a ball of radius 3 gives back a diameter of 6.
A
Runs in your browser
➗ MathFree
Sphere great circle calculator
Give the radius of a sphere and size its largest circle: a radius of 5 gives a great circle of 10π around, an enclosed disk of π times 5 squared and a diameter…
P
Runs in your browser
➗ MathFree
Sphere radius from surface area calculator
Work back from a sphere's outer skin to its size: a surface area of 4π gives a radius of 1 and a diameter of 2.
S
Runs in your browser
➗ MathFree
Sphere surface area calculator
Give the radius of a ball and get its outer skin: a radius of 3 gives a diameter of 6 and a surface of four times π times 3 squared, the area to paint, plate or…
P
Runs in your browser
➗ MathFree
Spherical cap surface area
Measure just the curved skin of a dome, the part you clad, coat or use for heat transfer: a cap 2 high on a sphere of radius 5 has a curved area of 20π.
A
Runs in your browser
➗ MathFree
Spherical lune area calculator
Find the area of the slice of a sphere's surface between two meridians that meet at the poles: a 90° angle covers exactly one quarter of the sphere and 180°…
P
Runs in your browser
➗ MathFree
Spherical wedge volume calculator
Find how much of a solid ball lies between two half-planes that share a diameter: on a sphere of radius 5, a 90° opening holds 130.8996938996 cubic units, one…
P
Runs in your browser
➗ MathFree
Spindle torus calculator
Turn two radii into the volume and surface of a spindle torus, the doughnut whose tube is so fat that it crosses itself: a major radius of 1 with a minor radius…
A
Runs in your browser
➗ MathFree
Square area calculator
Square one side length to get the area of any square: a side of 5 gives 25 and a side of 12 gives 144, ready for tiles, paint or homework.
A
Runs in your browser
➗ MathFree
Square diagonal calculator
Multiply the side of a square by √2 and get its corner-to-corner diagonal: a side of 5 gives 7.071067811865 and a side of 1 gives 1.414213562373.
P
Runs in your browser
➗ MathFree
Square side from area calculator
Find the side of a square from its area by taking the square root: an area of 25 gives a side of 5, the length to mark out when a room, patio or garden bed…
A
Runs in your browser
➗ MathFree
Square side from diagonal calculator
Divide a square's diagonal by √2 to get its side: a diagonal of 14.142135623731 gives a side of 10, and a diagonal of 10 gives about 7.071067811865.
A
Runs in your browser
➗ MathFree
Stellated octahedron calculator
Enter one edge and get the volume and outer surface of the stella octangula, Kepler's star of two interlocking tetrahedra: an edge of 1 gives a volume of…
A
Runs in your browser
➗ MathFree
Stewart's theorem calculator
Find the length of the segment from a triangle's vertex to any point on the opposite side, from the three sides and the two pieces of the base: sides 7, 5 and 6…
S
Runs in your browser
➗ MathFree
Superellipse area calculator
Get the exact area inside a superellipse, from diamond to ellipse to squircle: semi-axes 2 and 1 with exponent 2 give the ellipse area 2π, and larger exponents…
S
Runs in your browser
➗ MathFree
Tangent length from external point
Find how long the tangent is from a point outside a circle to the spot where it touches: a radius of 3 and a distance of 5 from the centre give a tangent of 4.
P
Runs in your browser
➗ MathFree
Tetrahedron height calculator
Get the vertical height of a regular tetrahedron from its edge alone, the straight drop from one vertex to the opposite face: an edge of 6 gives a height of…
S
Runs in your browser
➗ MathFree
Tetrahedron inradius calculator
Find the radius of the largest ball that fits inside a regular tetrahedron and touches all four faces: an edge of 2 gives √6/6, about 0.408248290464.
P
Runs in your browser
➗ MathFree
Tetrahedron midradius calculator
Get the midradius of a regular tetrahedron, the radius of the sphere that grazes each of its six edges at the midpoint: an edge of 2 gives √2/2, about…
P
Runs in your browser
➗ MathFree
Tetrahedron surface area calculator
Get only the outer skin of a regular tetrahedron, the area you paint, plate, wrap or cut as a paper net: an edge of 2 gives a total surface of 6.9282032303…
A
Runs in your browser
➗ MathFree
Trapezoid diagonal calculator
Get both diagonals of a trapezoid from its two bases, two legs and height. Bases 6 and 12 with legs of 5 and a height of 4 give two diagonals of 9.848857801796…
P
Runs in your browser
➗ MathFree
Trapezoid height from area calculator
Work backwards from a trapezoid's area to its perpendicular height: an area of 60 with bases 8 and 12 gives a height of 6, with a midsegment of 10 to check the…
S
Runs in your browser
➗ MathFree
Trapezoid perimeter calculator
Add up all four sides of a trapezoid to get the distance around it: bases 8 and 12 with legs of 5 and 5 give a perimeter of 30, the length of fence, trim or…
A
Runs in your browser
➗ MathFree
Triakis tetrahedron calculator
Get the volume and surface of a triakis tetrahedron, the twelve-faced solid made by raising a small pyramid on each face of a tetrahedron: a shorter edge of 1…
P
Runs in your browser
➗ MathFree
Triangle altitude lengths calculator
Get all three heights of a triangle from its sides alone: for sides 3, 4 and 5 the area is 6 and the heights are 4, 3 and 2.4.
S
Runs in your browser
➗ MathFree
Triangle angle bisector lengths
Get the three internal angle bisector lengths from the sides alone: a 3-4-5 triangle has bisectors of 4.216370213558, 3.35410196625 and 2.424366106925.
P
Runs in your browser
➗ MathFree
Triangle inequality checker
Check in one step whether three lengths can close into a triangle: 3, 4 and 5 can, while 1, 2 and 3 cannot, because 1 plus 2 only equals 3.
P
Runs in your browser
➗ MathFree
Triangle inradius calculator
A 3-4-5 triangle has room for an inscribed circle of radius 1: the calculator divides the area, 6, by half the perimeter, also 6.
A
Runs in your browser
➗ MathFree
Triangle semiperimeter calculator
Add the three sides and halve the total: for 3, 4 and 5 the perimeter is 12 and the semiperimeter 6.
P
Runs in your browser
➗ MathFree
Triangle type by angles
Enter three interior angles and see whether the triangle is acute, right or obtuse: 60°, 60° and 60° is acute, 90°, 45° and 45° is right, and 120°, 30° and 30°…
A
Runs in your browser
➗ MathFree
Triangular pyramid calculator
Get the volume and surface area of a regular triangular pyramid from just two measurements: a base edge of 2 and a height of 3 give a volume of 1.732050807569…
A
Runs in your browser
➗ MathFree
Truncated cube calculator
Enter one edge length and get the volume and surface area of a truncated cube: an edge of 1 gives a volume of 13.599663291074 and a surface of 32.434664363615.
P
Runs in your browser
➗ MathFree
Truncated dodecahedron calculator
A truncated dodecahedron with an edge of 1 encloses a volume of 85.039664559371 and has a surface of 100.990760153102, shared by twelve regular decagons and…
A
Runs in your browser
➗ MathFree
Truncated icosidodecahedron
With one edge length you get the volume and surface of a truncated icosidodecahedron: an edge of 1 gives a volume of 206.803398874989 and a surface of…
A
Runs in your browser
➗ MathFree
Truncated octahedron calculator
From one edge length you get the volume and surface area of a truncated octahedron: an edge of 1 means a volume of 11.313708498985 and a surface of…
P
Runs in your browser
➗ MathFree
Truncated tetrahedron calculator
Find the volume and surface of a truncated tetrahedron from the length of one edge; an edge of 1 gives 2.710575994548 in volume and 12.124355652982 in surface…
A
Runs in your browser
➗ MathFree
Direction angle of a vector calculator
Get the direction of a 2D vector from its components: the vector (3, 4) points at 53.130102354156° from the positive x-axis, or 0.927295218002 radians, with a…
A
Runs in your browser
❤️ Health & fitnessFree
Adjusted body weight calculator
Blend actual and ideal weight into one adjusted figure: at 100 kg actual and 70 kg ideal, the excess is 30 kg and the adjusted body weight is 82 kg, using the…
P
Runs in your browser
❤️ Health & fitnessFree
Appendicular skeletal muscle mass calculator
Estimate the muscle in the arms and legs without a scan: a 65-year-old man of 75 kg and 175 cm has about 24.007 kg of limb muscle and an index of 7.839 kg/m²…
S
Runs in your browser
❤️ Health & fitnessFree
Original Harris-Benedict 1919 BMR calculator
Reproduce the classic 1919 Harris-Benedict result exactly: a 30-year-old man of 80 kg and 180 cm comes out at 1,864.545 kcal a day.
A
Runs in your browser
No 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
$0.00
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 — 7800+ 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.