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.
📏 Unit convertersFree
Mass flow rate converter
Read a mass throughput in the unit your datasheet uses: 1 kg/s is 7936.641438655593 pounds per hour.
A
Runs in your browser
📏 Unit convertersFree
Molar mass converter
Convert molar mass between g/mol, kg/mol and kg/kmol: water's 18.015 g/mol is also 18.015 kg/kmol, while 1 kg/mol is 1000 g/mol.
A
Runs in your browser
📏 Unit convertersFree
Momentum converter
Convert linear momentum between kg·m/s, g·cm/s and lb·ft/s: 10 kg·m/s is 1000000 g·cm/s. Compare an SI textbook value with an older cgs lab manual or a US…
S
Runs in your browser
📏 Unit convertersFree
Running pace converter
Restate one running pace on every common scale: 5 minutes per kilometer is 12 km/h, 8.04672 minutes per mile and 7.45645430685 mph, so a metric race plan and an…
A
Runs in your browser
📏 Unit convertersFree
Paper size dimensions
Get the exact size of any common sheet before you print or design: A4 is 210 × 297 mm, or 8.26771653543 × 11.6929133858 inches, with the same pairing for…
A
Runs in your browser
📏 Unit convertersFree
Paper weight converter
Find out that 20 lb bond paper is about 75 gsm, or go the other way, for text, bond, cover and index stock.
S
Runs in your browser
📏 Unit convertersFree
Power converter
1000 watts is 1.3410220896 mechanical horsepower. Switch between watts, kilowatts, megawatts, horsepower, BTU per hour and foot-pounds per second for motor…
S
Runs in your browser
📏 Unit convertersFree
PPM percent converter
1000 ppm is 0.1 %, 1 % is ten thousand ppm and 1 ppm is 1000 ppb. Enter one concentration and see it at once in ppm, ppb, percent and per-mille, so labels, lab…
A
Runs in your browser
📏 Unit convertersFree
Radiation exposure converter
Turn survey-meter readings into SI units and back: 1 roentgen is exactly 0.000258 C/kg and 1 milliroentgen is a thousandth of a roentgen, so logs and quizzes…
A
Runs in your browser
📏 Unit convertersFree
Radioactivity converter
Move an activity reading between becquerels, curies and rutherfords with every common prefix: one curie is exactly 3.7 × 10¹⁰ becquerels, so assay certificates…
P
Runs in your browser
📏 Unit convertersFree
Electrical resistance converter
Convert resistance across five decades of units with fixed SI factors: 1000 Ω is exactly 1 kΩ, so milliohm shunts, kilohm pull-ups and gigaohm insulation…
S
Runs in your browser
📏 Unit convertersFree
Electrical resistivity converter
Put resistivity from any table into the unit you need: copper's 1.68 × 10⁻⁸ Ω·m becomes 1.68 µΩ·cm, and wire-table values in ohm circular-mil per foot map…
S
Runs in your browser
📏 Unit convertersFree
Ring size converter
Enter the ring size you know and see it in every system: a US 7 is a UK O, an EU 54 and an inside diameter of about 17.35 mm, with the circumference worked out…
A
Runs in your browser
📏 Unit convertersFree
Roof pitch converter
Translate one roof pitch into the other notations: a 6/12 roof is about 26.57 degrees and a 50 % slope, so framing plans, inspection notes and drainage specs…
A
Runs in your browser
📏 Unit convertersFree
Shoe size converter
Enter one shoe size, its scale and men's or women's, and get the other three: a men's US 9 is a UK 8, an EU 41.91 and a 27.94 cm last length, so ordering abroad…
P
Runs in your browser
📏 Unit convertersFree
Slope grade converter
A 10% grade is a 1:10 rise over run and about 5.71 degrees, not 10. Enter one slope as a percent, an angle or a ratio and get the other two, for road plans…
A
Runs in your browser
📏 Unit convertersFree
Solid angle converter
One steradian is 3282.8063500117 square degrees. Convert a solid angle between steradians, square degrees, spat and fractions of a sphere when a datasheet and a…
S
Runs in your browser
📏 Unit convertersFree
Sound pressure level converter
One pascal is about 94 dB SPL and 20 micropascals is 0 dB. Convert sound pressure between pascals, micropascals and decibels SPL, or a pressure ratio into…
A
Runs in your browser
📏 Unit convertersFree
Specific energy converter
1 kJ/kg is 0.239005736138 cal/g. Convert energy per unit mass between J/kg, kJ/kg, thermochemical calories per gram and BTU per pound when a problem set, a fuel…
A
Runs in your browser
📏 Unit convertersFree
Specific heat capacity converter
4184 J/(kg·K) is exactly 1 cal/(g·°C). Convert a specific heat capacity between joules per kilogram-kelvin, calories per gram-degree Celsius and BTU per…
P
Runs in your browser
📏 Unit convertersFree
Specific volume converter
1 m³/kg is 1000 L/kg. Convert volume per unit mass between cubic metres per kilogram, litres per kilogram and cubic feet per pound when a steam-property note…
A
Runs in your browser
📏 Unit convertersFree
Speed converter
10 m/s is 36 km/h. Convert a speed between metres per second, kilometres per hour, miles per hour, knots and feet per second for road limits, sailing logs, wind…
P
Runs in your browser
📏 Unit convertersFree
Surface tension converter
72.8 mN/m is exactly 72.8 dyn/cm and 0.0728 N/m. Convert surface tension between N/m, mN/m, dyn/cm and lbf/ft when water-like values near 72 mN/m meet older…
P
Runs in your browser
📏 Unit convertersFree
Thermal conductivity converter
1 W/(m·K) is 0.5777893165 BTU/(h·ft·°F). Move a material's conductivity between SI datasheets, older US insulation literature and CGS calorie tables, always…
S
Runs in your browser
📏 Unit convertersFree
Thermal resistance converter
1 K/W is 0.52752792631 °F·h/BTU, and 1 °C/W is exactly 1 K/W. Convert a thermal resistance between heatsink datasheets, SI models and imperial insulation…
A
Runs in your browser
📏 Unit convertersFree
Time unit converter
90 seconds are 1.5 minutes, 0.025 hours or 90,000 milliseconds. Convert a duration between seconds, minutes, hours, days, weeks, milliseconds and microseconds…
A
Runs in your browser
📏 Unit convertersFree
Torque converter
50 N·m is 36.878107463863 lbf·ft. Convert torque between newton-metres, newton-centimetres, pound-force feet, pound-force inches and kilogram-force metres, with…
P
Runs in your browser
📏 Unit convertersFree
Screen size converter
A 55-inch 16:9 screen measures 139.7 cm diagonally, about 121.75910254 cm wide and 68.48949518 cm high.
A
Runs in your browser
📏 Unit convertersFree
Points to pixels converter
12 points are 16 CSS pixels. Convert type sizes between points, pixels and picas with the CSS rule of 96 pixels and 72 points per inch, to move print specs from…
A
Runs in your browser
📏 Unit convertersFree
PX to EM converter
24 px is 1.5 em when the parent font size is 16 px. Convert CSS lengths between pixels and em in either direction against the parent font size, and get a…
S
Runs in your browser
📏 Unit convertersFree
px to rem converter
With a 16 px root, 16 px is 1 rem and 0.5 rem is 8 px. Convert CSS lengths between pixels and rem against the root font size your stylesheet actually sets, and…
P
Runs in your browser
📏 Unit convertersFree
Voltage converter
5 V is 5000 mV. Convert an electric potential between volts, millivolts, microvolts, kilovolts and megavolts with exact SI prefixes, and get the factor and…
P
Runs in your browser
📏 Unit convertersFree
Volume converter
Move a recipe, a packing list or a lab procedure between metric and US volume units: one US gallon is 3.785411784 liters, and every conversion passes through…
A
Runs in your browser
📏 Unit convertersFree
Water hardness converter
Put a city water report and a softener manual on the same scale: one grain per gallon is 17.1 ppm and one German degree is 17.8 ppm, and every reading bridges…
S
Runs in your browser
📏 Unit convertersFree
Wire gauge converter
Turn an AWG number into real dimensions: 12 AWG, the usual branch-circuit copper, measures 2.052525388494 mm across.
P
Runs in your browser
➗ MathFree
Complete the square calculator
x² + 6x + 5 becomes (x + 3)² − 4, with its vertex at (−3, −4): enter the three coefficients and get the vertex form, the turning point and the axis of symmetry…
S
Runs in your browser
➗ MathFree
Cross product calculator
(2, 3, 4) × (5, 6, 7) is (−3, 6, −3), and the parallelogram they span has area √54: enter two vectors in space and get the perpendicular vector and that area.
S
Runs in your browser
➗ MathFree
Exponent rules calculator
Turn a chain of powers with one base into a single power: 2³ · 2⁵ becomes 2⁸, which is 256. Choose multiply, divide or power of a power and the right exponent…
S
Runs in your browser
➗ MathFree
Linear inequality solver
Type 2x + 3 < 11 and get x < 4, also written as the interval (−∞, 4). When the coefficient of x is negative, the inequality sign is reversed for you and the…
S
Runs in your browser
➗ MathFree
Matrix inverse calculator
Enter rows 4, 7 and 2, 6 to get the inverse with rows 0.6, −0.7 and −0.2, 0.4, plus the determinant 10.
S
Runs in your browser
➗ MathFree
Matrix multiplication calculator
Multiply a 2 × 3 matrix by a 3 × 2 matrix and get a 2 × 2 product: rows 1, 2, 3 and 4, 5, 6 times rows 7, 8; 9, 10; 11, 12 give 58, 64 and 139, 154.
S
Runs in your browser
➗ MathFree
Polynomial long division calculator
Check a polynomial long division in seconds: x² − 3x + 2 divided by x − 1 gives the quotient x − 2 with remainder 0, so x − 1 is a factor.
S
Runs in your browser
➗ MathFree
Polynomial GCD calculator
Find the factor two polynomials share: x² − 3x + 2 and x − 1 have greatest common divisor x − 1, found in 1 Euclidean step and always scaled to lead with 1.
S
Runs in your browser
➗ MathFree
Reduced row echelon form calculator
Row-reduce a matrix all the way: a 3 × 4 system becomes three pivots equal to 1, zeros above and below each one, and a last column of -8, 1 and -2, with rank 3.
S
Runs in your browser
➗ MathFree
3×3 system of equations solver
Three equations, three unknowns, one answer: the textbook system x + y + z equal to 6, 2y + 5z equal to −4 and one more equation gives 5, 3 and −2.
S
Runs in your browser
🔬 ScienceFree
Absolute magnitude calculator
A star of apparent magnitude 0 at 100 parsecs has an absolute magnitude of -5, while one of magnitude 5 at 10 parsecs stays at 5.
S
Runs in your browser
🔬 ScienceFree
Light travel time calculator
Find how long light needs to cover a distance in space: one astronomical unit takes about 499 seconds, the familiar eight-minute delay of sunlight.
S
Runs in your browser
🔬 ScienceFree
Planet density calculator
Earth's mass of 5.972e+24 kg and radius of 6371000 m give a mean density of 5513.2587385891 kg/m³.
S
Runs in your browser
🔬 ScienceFree
Schwarzschild radius calculator
A mass of 1.9885e+30 kg, about the Sun's, has a Schwarzschild radius of 2953.3839390285 m, roughly 2.95 km.
S
Runs in your browser
🔬 ScienceFree
Surface gravity calculator
Get the pull at the surface of any world from its mass and size: 5.972 × 10²⁴ kg and 6371000 m, Earth's values, give 9.8199734262 m/s², ready for weight and…
S
Runs in your browser
🔬 ScienceFree
Telescope resolution calculator
See the diffraction limit of any telescope from its size and the colour of light: a 10 cm aperture at 550 nm resolves 1.3840368499 arcseconds, and larger…
S
Runs in your browser
🔬 ScienceFree
Arrhenius equation calculator
With an activation energy of 50000 J/mol at 298.15 K and a pre-exponential factor of 10¹², the rate constant is 1737.367006085, in the same units as the factor.
S
Runs in your browser
🔬 ScienceFree
Arrhenius temperature calculator
Run the Arrhenius equation backwards: enter k, A and Ea and get the temperature in kelvin, 298.15 K in the worked example with Ea of 50000 J/mol.
S
Runs in your browser
🔬 ScienceFree
Average molecular speed calculator
Find how fast gas molecules move on average: oxygen at 32 g/mol and 298 K averages about 444 m/s. Enter the molar mass in g/mol and the temperature in kelvin…
S
Runs in your browser
🔬 ScienceFree
Average rate of reaction calculator
Get the mean rate of a reaction from two readings: a concentration change of 0.12 over 30 time units gives 0.004 per unit of time.
S
Runs in your browser
🔬 ScienceFree
Avogadro's law moles calculator
Find the moles of gas that match a new volume at fixed temperature and pressure: 1 mol in 2 litres corresponds to 2 mol in 4 litres.
S
Runs in your browser
🔬 ScienceFree
Boiling point elevation calculator
See how far a dissolved solute pushes up the boiling point: 0.5 mol/kg with a water-like Kb of 0.512 adds 0.256 K, or 0.512 K when each formula unit splits into…
S
Runs in your browser
🔬 ScienceFree
Born-Haber lattice energy calculator
Close the Born-Haber cycle and get the lattice energy of an ionic solid: for sodium chloride, formation −411, sublimation 108, ionization 496, dissociation 121…
S
Runs in your browser
🔬 ScienceFree
Charles's law final volume calculator
See how much a gas expands or shrinks when its temperature changes at constant pressure: 2 litres at 300 K become 4 litres at 600 K.
S
Runs in your browser
🔬 ScienceFree
Vaporization enthalpy calculator
Get a liquid's latent heat of vaporization from two vapor-pressure readings: a pressure that doubles from 1000 to 2000 between 300 K and 310 K gives the…
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.