ForHosting KIT

Everything you need.
One Kit.

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.

REST APILive
EmailLive
Webforhosting.com/kitLive
TelegramLive
iOS & AndroidBuilding
WhatsAppComing
7554ready-made tools
6channels
1API & key
$0.002per call, from

New capabilities

Fresh in the kit — just landed.

New⚙️ Developer UtilitiesVolume to density calculatorρ=m/V from mass and volumeAabuela$0.002Open phys.volume_to_densityNew⚙️ Developer UtilitiesVoltage regulation calculator% from no-load and full-load VSsamurai$0.002Open phys.voltage_regulationNew⚙️ Developer UtilitiesVickers hardness number calculatorHV from force and diagonalPPavilion$0.002Open phys.vickers_hardness_numberNew⚙️ Developer UtilitiesVelocity calculatoraverage v = d/t in metres per secondAabuela$0.002Open phys.velocityNew⚙️ Developer UtilitiesValve flow coefficient calculatorCv from GPM, ΔP and GSsamurai$0.002Open phys.valve_flow_coefficientNew⚙️ Developer UtilitiesBarrel twist rate calculatorGreenhill formula, one turn per inchPPavilion$0.002Open phys.twist_rateNew⚙️ Developer UtilitiesTrue strain calculatorε_t = ln(1+ε) from engineering strainAabuela$0.002Open phys.true_strainNew⚙️ Developer UtilitiesTransmission coefficient calculatorpower T from η₁, η₂Ssamurai$0.002Open phys.transmissionNew⚙️ Developer UtilitiesTorsional stiffness calculatorκ = GJ/L in N·m/rad, freePPavilion$0.002Open phys.torsional_stiffnessNew⚙️ Developer UtilitiesTorsional spring calculatorκ = E d⁴ / (64 D N), N·mm/radAabuela$0.002Open phys.torsional_springNew⚙️ Developer UtilitiesToilet paper race mass moment of inertiaI = ½m(ri²+ro²)Ssamurai$0.002Open phys.toilet_paper_race_mass_moment_inertiaNew⚙️ Developer UtilitiesTime dilation calculatordilated time from proper time and velocityPPavilion$0.002Open phys.time_dilation

The full catalog

Search or filter by category. Every capability is its own endpoint with a published price.

⚙️ Developer UtilitiesFree
Pounds per minute converter
lb/min to kg/s, free
PPavilion
POST /phys/pounds-per-minute$0.002
⚙️ Developer UtilitiesFree
Pounds per square inch converter
psi to Pa, bar and atm, free
Aabuela
POST /phys/pounds-per-square-inch$0.002
⚙️ Developer UtilitiesFree
Prandtl-Meyer expansion calculator
angle and Mach from M, γ
Ssamurai
POST /phys/prandtl-meyer-expansion$0.002
⚙️ Developer UtilitiesFree
Principal stress calculator
both σ1 and σ2 from plane stress
PPavilion
POST /phys/principal-stress$0.002
⚙️ Developer UtilitiesFree
Projectile motion calculator
range, max height, flight time
Aabuela
POST /phys/projectile-motion$0.002
⚙️ Developer UtilitiesFree
Pulley calculator
mechanical advantage, tension, pulling force
Ssamurai
POST /phys/pulley$0.002
⚙️ Developer UtilitiesFree
Quantum number calculator
n, l, ml, ms and orbital capacity
Aabuela
POST /phys/quantum-number$0.002
⚙️ Developer UtilitiesFree
Projectile motion range calculator
speed, angle, gravity
PPavilion
POST /phys/range-projectile-motion$0.002
⚙️ Developer UtilitiesFree
RC circuit calculator
capacitor voltage over time, free
Ssamurai
POST /phys/rc-circuit$0.002
⚙️ Developer UtilitiesFree
Reaction time calculator
driver reaction distance from speed
Aabuela
POST /phys/reaction-time$0.002
⚙️ Developer UtilitiesFree
Refrigerant capillary tube calculator
required tube length
Ssamurai
POST /phys/refrigerant-capillary-tube$0.002
⚙️ Developer UtilitiesFree
Relativistic kinetic energy calculator
KE=(γ-1)mc² in joules
PPavilion
POST /phys/relativistic-ke$0.002
⚙️ Developer UtilitiesFree
Resistor wattage calculator
min rating from P=I²R, free
Aabuela
POST /phys/resistor-wattage$0.002
⚙️ Developer UtilitiesFree
RLC circuit calculator
f0, Z, and Q from R, L, C, free
PPavilion
POST /phys/rlc-circuit$0.002
⚙️ Developer UtilitiesFree
RLC impedance calculator
|Z| and phase from R, L, C, f
Aabuela
POST /phys/rlc-impedance$0.002
⚙️ Developer UtilitiesFree
RMS speed calculator
v_rms from T and molar mass (m/s)
Ssamurai
POST /phys/rms-speed$0.002
⚙️ Developer UtilitiesFree
Rotational stiffness calculator
κ = GJ/L in N·m/rad, free
Aabuela
POST /phys/rotational-stiffness$0.002
⚙️ Developer UtilitiesFree
Rydberg equation calculator
hydrogen emission wavelength
Ssamurai
POST /phys/rydberg-equation$0.002
⚙️ Developer UtilitiesFree
Section modulus calculator
elastic S = I/c from I and fiber distance
PPavilion
POST /phys/section-modulus$0.002
⚙️ Developer UtilitiesFree
Shaft size calculator
min diameter from torque and shear
Aabuela
POST /phys/shaft-size$0.002
⚙️ Developer UtilitiesFree
Shear modulus calculator
G = τ/γ in pascals, free
Ssamurai
POST /phys/shear-modulus$0.002
⚙️ Developer UtilitiesFree
Shear wave velocity calculator
vs = √(G/ρ) in m/s, free
PPavilion
POST /phys/shear-wave-velocity$0.002
⚙️ Developer UtilitiesFree
Simple harmonic motion calculator
displacement x=A cos(ωt+φ)
Aabuela
POST /phys/simple-harmonic-motion$0.002
⚙️ Developer UtilitiesFree
Simple pendulum calculator
T = 2π√(L/g) period from L and g
Ssamurai
POST /phys/simple-pendulum$0.002
⚙️ Developer UtilitiesFree
Slenderness ratio calculator
column λ = L/r from length and r
PPavilion
POST /phys/slenderness-ratio$0.002
⚙️ Developer UtilitiesFree
Sound wavelength calculator
λ = v/f from frequency
Ssamurai
POST /phys/sound-wavelength$0.002
⚙️ Developer UtilitiesFree
Space travel time dilation
Lorentz factor from v/c, free
PPavilion
POST /phys/space-travel$0.002
⚙️ Developer UtilitiesFree
Specific gravity calculator
SG = ρ / ρ_ref, dimensionless
Aabuela
POST /phys/specific-gravity$0.002
⚙️ Developer UtilitiesFree
Speed of sound in solids
bar velocity v = √(E/ρ)
Ssamurai
POST /phys/speed-sound-solids$0.002
⚙️ Developer UtilitiesFree
Speeds and feeds calculator
spindle RPM and feed per minute
Aabuela
POST /phys/speeds-and-feeds$0.002
⚙️ Developer UtilitiesFree
Spring calculator
restoring force F=-kx in newtons
PPavilion
POST /phys/spring$0.002
⚙️ Developer UtilitiesFree
Stefan-Boltzmann law
black-body radiated power P = σAT⁴
Ssamurai
POST /phys/stefan-boltzmann-law$0.002
⚙️ Developer UtilitiesFree
Stokes' law calculator
settling velocity of a small sphere
PPavilion
POST /phys/stokes-law$0.002
⚙️ Developer UtilitiesFree
Stopping distance calculator
reaction plus braking in metres
Aabuela
POST /phys/stopping-distance$0.002
⚙️ Developer UtilitiesFree
Sunset time calculator
local hours from latitude and declination
Ssamurai
POST /phys/sunset$0.002
⚙️ Developer UtilitiesFree
SUVAT calculator
final velocity or displacement from u, a, t
Aabuela
POST /phys/suvat$0.002
⚙️ Developer UtilitiesFree
Telescope field of view
true FOV from AFOV and magnification
PPavilion
POST /phys/telescope-field-of-view$0.002
⚙️ Developer UtilitiesFree
Thermal energy calculator
Q=mcΔT in joules from mass, c, ΔT
Ssamurai
POST /phys/thermal-energy$0.002
⚙️ Developer UtilitiesFree
Thermal expansion calculator
ΔL = L₀·α·ΔT, free
Aabuela
POST /phys/thermal-expansion$0.002
⚙️ Developer UtilitiesFree
Thermal resistance calculator
R = L/(kA) in K/W, free
PPavilion
POST /phys/thermal-resistance$0.002
⚙️ Developer UtilitiesFree
Thin lens equation
image distance from f and object distance
Ssamurai
POST /phys/thin-lens-equation$0.002
⚙️ Developer UtilitiesFree
Thrust-to-weight calculator
TWR = F/W for rockets, free
Aabuela
POST /phys/thrust-weight$0.002
⚙️ Developer UtilitiesFree
Time dilation calculator
dilated time from proper time and velocity
PPavilion
POST /phys/time-dilation$0.002
⚙️ Developer UtilitiesFree
Toilet paper race mass moment of inertia
I = ½m(ri²+ro²)
Ssamurai
POST /phys/toilet-paper-race-mass-moment-inertia$0.002
⚙️ Developer UtilitiesFree
Torsional spring calculator
κ = E d⁴ / (64 D N), N·mm/rad
Aabuela
POST /phys/torsional-spring$0.002
⚙️ Developer UtilitiesFree
Torsional stiffness calculator
κ = GJ/L in N·m/rad, free
PPavilion
POST /phys/torsional-stiffness$0.002
⚙️ Developer UtilitiesFree
Transmission coefficient calculator
power T from η₁, η₂
Ssamurai
POST /phys/transmission$0.002
⚙️ Developer UtilitiesFree
True strain calculator
ε_t = ln(1+ε) from engineering strain
Aabuela
POST /phys/true-strain$0.002
⚙️ Developer UtilitiesFree
Barrel twist rate calculator
Greenhill formula, one turn per inch
PPavilion
POST /phys/twist-rate$0.002
⚙️ Developer UtilitiesFree
Valve flow coefficient calculator
Cv from GPM, ΔP and G
Ssamurai
POST /phys/valve-flow-coefficient$0.002
⚙️ Developer UtilitiesFree
Velocity calculator
average v = d/t in metres per second
Aabuela
POST /phys/velocity$0.002
⚙️ Developer UtilitiesFree
Vickers hardness number calculator
HV from force and diagonal
PPavilion
POST /phys/vickers-hardness-number$0.002
⚙️ Developer UtilitiesFree
Voltage regulation calculator
% from no-load and full-load V
Ssamurai
POST /phys/voltage-regulation$0.002
⚙️ Developer UtilitiesFree
Volume to density calculator
ρ=m/V from mass and volume
Aabuela
POST /phys/volume-to-density$0.002

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.

Balance
$10.00+

Top up your balance and spend it across web, API and the app. It never expires.