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.
🏠 Home, food & hobbiesFree
Brick calculator
623 bricks is the order for a 10 m² wall in 215 by 65 mm bricks with 10 mm joints and the default 5 percent waste.
S
Runs in your browser
🏠 Home, food & hobbiesFree
Drywall sheet calculator
40 m² of wall and 20 m² of ceiling in 2.4 × 1.2 m sheets, with 10% waste, need 23 sheets and 736 screws at 32 per sheet.
S
Runs in your browser
🏠 Home, food & hobbiesFree
Fence picket calculator
A 100-inch run with 3.5-inch pickets and 3.5-inch gaps takes 15 pickets, laid out picket, gap, picket and ending on a board, so you never under-order.
S
Runs in your browser
🏠 Home, food & hobbiesFree
Grass seed calculator
A 5,000-square-foot lawn seeded at 5 pounds per 1,000 square feet needs 25 pounds of seed. Turn the rate on the bag into seed per square foot, multiply by your…
S
Runs in your browser
🏠 Home, food & hobbiesFree
Mulch calculator
A 200 square foot bed mulched 3 inches deep takes 50 cubic feet, or 1.8519 cubic yards for a bulk order, which is 25 bags of the common 2 cubic foot size.
S
Runs in your browser
🏠 Home, food & hobbiesFree
Paint quantity calculator
Painting 48 m² of wall with 2 coats at 10 m² per litre takes 9.6 litres, so you buy 10. Enter the wall area or the room's length, width and height, subtract…
S
Runs in your browser
🏠 Home, food & hobbiesFree
Rafter length calculator
A 24 ft span at a 6/12 pitch with a 1.5 ft overhang needs a common rafter about 14.9 ft long, 13.4164 from ridge to plate plus the tail.
S
Runs in your browser
🏠 Home, food & hobbiesFree
Retaining wall block calculator
A 10 m wall 1.2 m high, built with 0.4 by 0.2 m blocks, takes 6 courses of 25 blocks, 150 in all. Enter the run, the finished height and the block face in one…
S
Runs in your browser
🏠 Home, food & hobbiesFree
Tile grout calculator
300 mm square tiles with 3 mm joints, 8 mm deep, over 10 m² take 2.5221 kg of grout, or 3 kg rounded up for buying.
S
Runs in your browser
🏠 Home, food & hobbiesFree
Room wall area calculator
A 5 by 4 m room with 2.4 m walls has 43.2 m² of wall; take away 4.5 m² of doors and windows and 38.7 m² is left to paint or paper.
S
Runs in your browser
🏠 Home, food & hobbiesFree
Cost per day calculator
A yearly price of 365 works out to 1 a day, and 1,200 a year to 100 a month. Enter any annual cost, from insurance to a membership, and see it as a daily…
S
Runs in your browser
🏠 Home, food & hobbiesFree
Cost per use calculator
A coat that cost 120 and gets worn 40 times costs 3 per wear. Divide any price by its expected uses to compare items with different price tags and lifespans on…
S
Runs in your browser
🏠 Home, food & hobbiesFree
Emergency fund calculator
Essential bills of 3000 a month covered for 6 months make an emergency fund target of 18000. Enter what you must still pay each month if income stops and how…
S
Runs in your browser
🏠 Home, food & hobbiesFree
Hourly to salary converter
At 25 an hour, 40 hours a week for 52 weeks, you earn 52,000 a year and 1,000 a week. Enter your wage, weekly hours and weeks worked to compare an hourly job…
S
Runs in your browser
🏠 Home, food & hobbiesFree
Reverse sales tax calculator
A receipt total of 108 at an 8% rate splits into 100 before tax and 8 of tax. Enter any tax-inclusive total and the rate in percent to back out the net amount…
S
Runs in your browser
🏠 Home, food & hobbiesFree
Rule of 72 calculator
At 8% a year your money doubles in about 9 years, because 72 divided by 8 is 9. Enter an annual growth rate in percent for a quick doubling estimate before you…
S
Runs in your browser
➗ MathFree
Geometric sequence calculator
With a first term of 2 and a ratio of 3, the 5th term is 162 and the first five terms add up to 242.
S
Runs in your browser
➗ MathFree
Pell number calculator
P10 is 2378: each Pell number is twice the previous one plus the one before, starting 0, 1, 2, 5, 12, 29.
S
Runs in your browser
➗ MathFree
Perfect square checker
Find out whether a whole number is a perfect square, or get the n-th square: 49 is a square with root 7, and square number 7 is 49.
S
Runs in your browser
➗ MathFree
Sum of first n cubes
Add up 1³ + 2³ + … + n³ exactly for any whole number n: the first 10 cubes sum to 3025, which is 55 squared, the square of the 10th triangular number.
S
Runs in your browser
➗ MathFree
Superfactorial calculator
Multiply the first n factorials exactly: the superfactorial of 5 is 1! × 2! × 3! × 4! × 5!, which is 34560, shown in full with its number of digits for any n…
S
Runs in your browser
➗ MathFree
Telescoping series sum
The first 10 terms of 1/(k(k+1)) add up to exactly 10/11. Enter how many terms you want and get the partial sum as a reduced fraction and a decimal, worked out…
S
Runs in your browser
➗ MathFree
Tetrahedral number calculator
The 5th tetrahedral number is 35, the balls in a triangular pyramid five layers high. Enter a position from 1 to 378,076 and get its exact value from…
S
Runs in your browser
🏗️ Engineering & constructionFree
Acceleration calculator
A speed gain of 20 m/s over 4 seconds is an average acceleration of 5 m/s²: enter the change in velocity and the time it took, and the calculator divides one by…
S
Runs in your browser
🏗️ Engineering & constructionFree
Circular motion velocity calculator
A 2 m radius covered in a 4 s lap gives a speed of π m/s, or one circumference of 4π m every period.
S
Runs in your browser
🏗️ Engineering & constructionFree
Free fall time calculator
Dropped from rest, an object falls 100 m in 4.5160075575 seconds under standard gravity of 9.80665 m/s².
S
Runs in your browser
🏗️ Engineering & constructionFree
Friction force calculator
A coefficient of 0.3 and a normal force of 100 N give 30 N of friction: multiply the two to see how hard the surfaces resist sliding, with static or kinetic…
S
Runs in your browser
🏗️ Engineering & constructionFree
Inelastic collision calculator
When a 2 kg cart at 3 m/s sticks to a 4 kg cart moving at −1 m/s, the pair moves on at 0.3333333333 m/s.
S
Runs in your browser
🏗️ Engineering & constructionFree
Lever calculator
With a 2 m effort arm and a 0.5 m load arm, a push of 25 N balances a 100 N load, a mechanical advantage of 4.
S
Runs in your browser
🏗️ Engineering & constructionFree
Gravitational potential energy calculator
Lift 2 kg by 5 m with g at 9.8 m/s² and it stores 98 J relative to where it started. Below the reference level the energy turns negative. Free in your browser.
S
Runs in your browser
🏗️ Engineering & constructionFree
Projectile max height calculator
Launch at 20 m/s and 45 degrees and the projectile peaks 10.1971621298 m above the launch point after 1.4420964982 seconds, with no air resistance.
S
Runs in your browser
🏗️ Engineering & constructionFree
RPM to linear speed calculator
A wheel of 0.25 m radius turning at 60 rpm makes one turn per second, so its rim covers a full circumference every second.
S
Runs in your browser
🏗️ Engineering & constructionFree
Spring potential energy calculator
A spring of 200 N/m stretched 0.1 m stores 1 J of elastic energy. Enter the stiffness and the stretch or compression to get the stored energy; this is spring…
S
Runs in your browser
🏗️ Engineering & constructionFree
Velocity components calculator
A speed of 10 m/s at 30° splits into 8.6602540378 m/s horizontally and 5 m/s vertically. Enter the speed and the angle from the horizontal to get both parts and…
S
Runs in your browser
🏗️ Engineering & constructionFree
Weight calculator
A 70 kg mass under standard Earth gravity of 9.80665 m/s² weighs 686.4655 N. Enter the mass and the local g, such as about 1.62 m/s² for the Moon, to get weight…
S
Runs in your browser
➗ MathFree
Abundant number checker
The proper divisors of 12 are 1, 2, 3, 4 and 6, which add up to 16, so 12 is abundant by 4. Enter any positive whole number to see its divisor sum, the excess…
S
Runs in your browser
➗ MathFree
Carmichael function calculator
λ(15) is 4: any number coprime to 15, raised to the 4th power, leaves remainder 1 when divided by 15, while Euler's φ(15) is 8.
S
Runs in your browser
➗ MathFree
Chinese remainder theorem solver
Solve simultaneous congruences in one step: x ≡ 2 mod 3, x ≡ 3 mod 5 and x ≡ 2 mod 7 give x ≡ 23 mod 105.
S
Runs in your browser
➗ MathFree
Collatz conjecture calculator
Start at 7 and the 3n+1 rule takes 16 steps to reach 1, climbing as high as 52 on the way. Enter any positive whole number to see its full path, step count and…
S
Runs in your browser
➗ MathFree
Coprime checker
8 and 15 are coprime: their greatest common divisor is 1. Enter any two integers, negatives and zero included, and get the exact common divisor plus a clear yes…
S
Runs in your browser
➗ MathFree
Kaprekar number checker
45 is a Kaprekar number: 45 squared is 2025, and 20 plus 25 gives 45 again. Enter any positive integer to test every way of splitting its square and see the…
S
Runs in your browser
➗ MathFree
Nth prime calculator
Find the prime at any position in the list of primes: the 10th prime is 29, counting 2 as the first.
S
Runs in your browser
➗ MathFree
Prime factorization calculator
Breaks a whole number into prime powers: 360 is 2³ × 3² × 5, with each prime shown next to its exponent.
S
Runs in your browser
➗ MathFree
Primitive root calculator
Finds the smallest primitive root of a prime: modulo 7 it is 3, whose powers run through all six nonzero remainders, while the powers of 2 repeat after three.
S
Runs in your browser
➗ MathFree
Smith number checker
Tells you whether a composite number's digits add up to the same total as the digits of its prime factors: 22 is a Smith number, since 2 + 2 equals 2 + 1 + 1…
S
Runs in your browser
🔬 ScienceFree
Double slit calculator
Get the gap between bright fringes in Young’s experiment: slits 0.5 mm apart, 600 nm light and a screen 2 m away give fringes 2.4 mm apart.
S
Runs in your browser
🔬 ScienceFree
Focal length calculator
Measure where the object and its image sit and get the focal length: an object at 30 with its image at 15 means a focal length of 10, a converging lens.
S
Runs in your browser
🔬 ScienceFree
Refractive index calculator
Light moving at two-thirds of its vacuum speed gives a refractive index of 1.5. Enter either the medium speed or the index and get the other, with c set to…
S
Runs in your browser
🔬 ScienceFree
Thin lens calculator
An object 30 units from a lens with a focal length of 10 forms a real, inverted image 15 units away at half size.
S
Runs in your browser
🔬 ScienceFree
Sound level distance calculator
A source measured at 90 dB from 1 metre is about 83.98 dB from 2 metres. Enter the level you measured, the distance where you measured it and a new distance to…
S
Runs in your browser
🔬 ScienceFree
Frequency calculator
Sound travelling at 340 metres per second with a wavelength of 0.68 metres has a frequency of 500 hertz.
S
Runs in your browser
🔬 ScienceFree
String harmonic frequency calculator
A 1 m string under 100 N of tension with a linear density of 0.01 kg/m vibrates at 50 Hz in its lowest mode.
S
Runs in your browser
➗ MathFree
Bayes theorem calculator
With a prior of 0.01, a sensitivity of 0.99 and a false-positive rate of 0.05, a positive result leaves about a 1 in 6 chance that the hypothesis is true.
S
Runs in your browser
➗ MathFree
Binomial probability calculator
In 10 trials with a success chance of 0.5, exactly 5 successes happen close to one time in four, and 5 or fewer a little over 60 percent of the time.
S
Runs in your browser
➗ MathFree
Lottery odds calculator
In a 6-from-49 game, matching exactly 3 numbers covers 246820 of the 13983816 possible draws, while the jackpot is a single one of them.
S
Runs in your browser
➗ MathFree
Negative binomial calculator
With a success chance of 0.4 per trial, the third success lands exactly on trial 8 just over 10 percent of the time, and on average it arrives at trial 7.5.
S
Runs in your browser
🔬 ScienceFree
Factor of safety calculator
An ultimate strength of 400 MPa against a working stress of 100 MPa gives a factor of safety of 4: the capacity holds the working stress four times over.
S
Runs in your browser
🔬 ScienceFree
Poisson's ratio calculator
A lateral strain of −0.003 with an axial strain of 0.01 gives a Poisson’s ratio of 0.3, typical of many metals.
S
Runs in your browser
🔬 ScienceFree
Engineering strain calculator
A 2 mm stretch on a 100 mm gauge length is an engineering strain of 0.02, or 2 %. A negative change means compression; both lengths just need the same unit.
S
Runs in your browser
➗ MathFree
Correlation coefficient calculator
The values 1 to 5 paired with 2, 4, 6, 8 and 10 give a Pearson r of exactly 1, a perfect positive straight-line link; reverse the second list and r becomes −1.
S
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.