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.

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iOS & AndroidBuilding
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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
Froude number calculator
Fr=V/√(gL) from velocity and length
PPavilion
POST /phys/froude-number$0.002
⚙️ Developer UtilitiesFree
Gear ratio RPM calculator
output shaft speed from tooth counts
Ssamurai
POST /phys/gear-ratio-rpm$0.002
⚙️ Developer UtilitiesFree
Gay-Lussac's law calculator
final pressure from kelvin temperature, free
Aabuela
POST /phys/gay-lussacs-law$0.002
⚙️ Developer UtilitiesFree
Generator power calculator
watts from voltage, current and PF
PPavilion
POST /phys/generator-power$0.002
⚙️ Developer UtilitiesFree
Ground speed calculator
TAS, wind speed and wind angle
Ssamurai
POST /phys/ground-speed$0.002
⚙️ Developer UtilitiesFree
Hair diffraction calculator
diameter from λ, L and Δy
Aabuela
POST /phys/hair-diffraction$0.002
⚙️ Developer UtilitiesFree
Hall coefficient calculator
R_H = V_H t / (I B) in m³/C
PPavilion
POST /phys/hall-coefficient$0.002
⚙️ Developer UtilitiesFree
Heisenberg uncertainty calculator
Δp min from Δx and ħ
Ssamurai
POST /phys/heisenberg-uncertainty$0.002
⚙️ Developer UtilitiesFree
Helical coil inductance calculator
L from turns, radius and length
Aabuela
POST /phys/helical-coil$0.002
⚙️ Developer UtilitiesFree
Helmholtz resonator calculator
resonance frequency from c, A, L, V
PPavilion
POST /phys/helmholtz-resonator$0.002
⚙️ Developer UtilitiesFree
Hoop stress calculator
thin-walled vessel σ = PD/(2t)
Ssamurai
POST /phys/hoop-stress$0.002
⚙️ Developer UtilitiesFree
Hubble's law calculator
recessional velocity from distance, free
Aabuela
POST /phys/hubbles-law$0.002
⚙️ Developer UtilitiesFree
Hydraulic gradient calculator
i=(h1-h2)/L from heads and distance
PPavilion
POST /phys/hydraulic-gradient$0.002
⚙️ Developer UtilitiesFree
Hydraulic radius calculator
R = A/P from area and perimeter
Ssamurai
POST /phys/hydraulic-radius$0.002
⚙️ Developer UtilitiesFree
Ideal gas temperature calculator
T = PV/nR in kelvin
PPavilion
POST /phys/ideal-gas-temperature$0.002
⚙️ Developer UtilitiesFree
Ideal gas pressure calculator
P=nRT/V in pascals, free
Aabuela
POST /phys/ideal-gas-pressure$0.002
⚙️ Developer UtilitiesFree
Ideal transformer calculator
secondary voltage, current or turns
Ssamurai
POST /phys/ideal-transformer$0.002
⚙️ Developer UtilitiesFree
Immersed weight calculator
apparent weight in a fluid, free
PPavilion
POST /phys/immersed-weight$0.002
⚙️ Developer UtilitiesFree
Insertion loss calculator
IL = 10·log10(Pin/Pout) in dB
Aabuela
POST /phys/insertion-loss$0.002
⚙️ Developer UtilitiesFree
Internal resistance calculator
r = (ε − V) / I, free
Ssamurai
POST /phys/internal-resistance$0.002
⚙️ Developer UtilitiesFree
Intrinsic carrier concentration calculator
n_i from N_c, N_v, E_g
PPavilion
POST /phys/intrinsic-carrier-concentration$0.002
⚙️ Developer UtilitiesFree
Knudsen number calculator
Kn=λ/L from mean free path
Ssamurai
POST /phys/knudsen-number$0.002
⚙️ Developer UtilitiesFree
J-pole antenna calculator
half-wave, quarter-wave and stub lengths
Aabuela
POST /phys/j-pole-antenna$0.002
⚙️ Developer UtilitiesFree
Kepler third law
satellite period from axis and mass
PPavilion
POST /phys/kepler-third-law$0.002
⚙️ Developer UtilitiesFree
Laser spot size calculator
focused diameter from λ, f and D
Ssamurai
POST /phys/laser-spot-size$0.002
⚙️ Developer UtilitiesFree
LED current calculator
series LED current in amperes, free
Aabuela
POST /phys/led$0.002
⚙️ Developer UtilitiesFree
Lensmaker's equation
thin-lens focal length from n, n_m, R1, R2
PPavilion
POST /phys/lensmakers-equation$0.002
⚙️ Developer UtilitiesFree
Linear actuator force calculator
F from torque, lead, efficiency
Aabuela
POST /phys/linear-actuator-force$0.002
⚙️ Developer UtilitiesFree
Lorentz force calculator
F = q(E + v × B) vector
Ssamurai
POST /phys/lorentz-force$0.002
⚙️ Developer UtilitiesFree
Lumen calculator
flux from candela and steradians, free
PPavilion
POST /phys/lumen$0.002
⚙️ Developer UtilitiesFree
Magnetic declination calculator
from true and compass bearings
Aabuela
POST /phys/magnetic-declination$0.002
⚙️ Developer UtilitiesFree
Magnetic dipole moment calculator
m = I A in A·m²
Ssamurai
POST /phys/magnetic-dipole-moment$0.002
⚙️ Developer UtilitiesFree
Magnetic force on a current-carrying wire
F = I L B sin(θ)
PPavilion
POST /phys/magnetic-force-on-current-carrying-wire$0.002
⚙️ Developer UtilitiesFree
Magnetic moment calculator
current loop μ = N·I·A, free
Aabuela
POST /phys/magnetic-moment$0.002
⚙️ Developer UtilitiesFree
Magnitude of acceleration
|a| from ax, ay, az, free
Ssamurai
POST /phys/magnitude-of-acceleration$0.002
⚙️ Developer UtilitiesFree
Manometer calculator
P=ρ·g·h from column height in Pa, free
PPavilion
POST /phys/manometer$0.002
⚙️ Developer UtilitiesFree
Mass to density calculator
ρ=m/V in kg/m³, free
Ssamurai
POST /phys/mass-to-density$0.002
⚙️ Developer UtilitiesFree
Maximum height projectile motion
peak height from v, angle, g
Aabuela
POST /phys/maximum-height-projectile-motion$0.002
⚙️ Developer UtilitiesFree
Mixed-air temperature calculator
two air streams, free
PPavilion
POST /phys/mixed-air$0.002
⚙️ Developer UtilitiesFree
AHU mixed air temperature
two streams by mass flow
Ssamurai
POST /phys/mixed-air-temperature$0.002
⚙️ Developer UtilitiesFree
AM modulation index calculator
m = Am / Ac, dimensionless
Aabuela
POST /phys/modulation$0.002
⚙️ Developer UtilitiesFree
Mohr's circle calculator
principal stresses and max shear
PPavilion
POST /phys/mohr-circle$0.002
⚙️ Developer UtilitiesFree
MOSFET threshold voltage
Vth from VFB, gamma, phi_s, VSB
Ssamurai
POST /phys/mosfet-threshold-voltage$0.002
⚙️ Developer UtilitiesFree
NE555 astable calculator
frequency and duty cycle from R1 R2 C
Aabuela
POST /phys/ne555-astable$0.002
⚙️ Developer UtilitiesFree
Newton's third law calculator
equal and opposite reaction force
PPavilion
POST /phys/newtons-third-law$0.002
⚙️ Developer UtilitiesFree
NPSH calculator
net positive suction head in metres from P, ρ, g
Ssamurai
POST /phys/npsh-net-positive-suction-head$0.002
⚙️ Developer UtilitiesFree
Ohm's law current calculator
I=V/R in amperes, free
Aabuela
POST /phys/ohms-law-current$0.002
⚙️ Developer UtilitiesFree
Ohm's law power calculator
watts from any two of V, I, R
PPavilion
POST /phys/ohms-law-power$0.002
⚙️ Developer UtilitiesFree
Open channel flow calculator
Manning Q from A, R, S, n
Ssamurai
POST /phys/open-channel-flow$0.002
⚙️ Developer UtilitiesFree
Optical density calculator
absorbance from I0 and I
Aabuela
POST /phys/optical-density$0.002
⚙️ Developer UtilitiesFree
Parallel capacitor calculator
equivalent C in farads
PPavilion
POST /phys/parallel-capacitor$0.002
⚙️ Developer UtilitiesFree
Parallel inductors calculator
equivalent L in henries, free
Ssamurai
POST /phys/parallel-inductors$0.002
⚙️ Developer UtilitiesFree
Particle velocity calculator
v from kinetic energy and mass
Aabuela
POST /phys/particles-velocity$0.002
⚙️ Developer UtilitiesFree
Performance coefficient calculator
COP = Q/W fridge & heat pump
Ssamurai
POST /phys/performance-coefficient$0.002
⚙️ Developer UtilitiesFree
Photoelectric effect calculator
K_max = hf − φ from frequency
PPavilion
POST /phys/photoelectric-effect$0.002
⚙️ Developer UtilitiesFree
Photon energy calculator
E=hf=hc/λ in joules, free
Aabuela
POST /phys/photon-energy$0.002
⚙️ Developer UtilitiesFree
Piston force calculator
F from pressure and bore
Ssamurai
POST /phys/piston-force$0.002
⚙️ Developer UtilitiesFree
Piston speed calculator
mean speed from stroke and RPM, free
Aabuela
POST /phys/piston-speed$0.002
⚙️ Developer UtilitiesFree
Pneumatic cylinder force calculator
extension force in N
PPavilion
POST /phys/pneumatic-cylinder-force$0.002
⚙️ Developer UtilitiesFree
Polar moment of inertia calculator
J = πd⁴/32 from diameter
Ssamurai
POST /phys/polar-moment$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
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On-device utilities — hash, QR, JSON, Text→PDF and more — run in your browser. No account, no limits.

Balance
$10.00+

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