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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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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
Mass percent to mole fraction calculator
free
AAspire
POST /chem/mass-percent-to-mole-fraction$0.002
⚙️ Developer UtilitiesFree
Mass to gas volume stoichiometry calculator
product gas V from mass, free
Aabuela
POST /chem/mass-to-volume-gas-stoich$0.002
⚙️ Developer UtilitiesFree
Mixing three solutions calculator
final concentration free
AAspire
POST /chem/mixing-three-solutions$0.002
⚙️ Developer UtilitiesFree
Mixing two solutions calculator
resulting concentration from C1 V1 + C2 V2
Aabuela
POST /chem/mixing-two-solutions$0.002
⚙️ Developer UtilitiesFree
Molality calculator
moles of solute per kg of solvent free
AAspire
POST /chem/molality$0.002
⚙️ Developer UtilitiesFree
Molality calculator
moles of solute over kg solvent, free
PPavilion
POST /chem/molality-from-moles-mass$0.002
⚙️ Developer UtilitiesFree
Molality to molarity calculator
convert m to M with density, free
PPavilion
POST /chem/molality-to-molarity$0.002
⚙️ Developer UtilitiesFree
Molar mass calculator
formula to g/mol from atomic weights
Aabuela
POST /chem/molar-mass$0.002
⚙️ Developer UtilitiesFree
Molar mass from freezing point depression calculator
free
AAspire
POST /chem/molar-mass-from-fp-depression$0.002
⚙️ Developer UtilitiesFree
Molar mass from osmotic pressure
van't Hoff M calculator, free
Aabuela
POST /chem/molar-mass-from-osmotic-pressure$0.002
⚙️ Developer UtilitiesFree
Molar solubility from Ksp calculator
s from Ksp and stoichiometry, free
Aabuela
POST /chem/molar-solubility-from-ksp$0.002
⚙️ Developer UtilitiesFree
Molar volume at STP calculator
ideal gas volume from moles at standard T and P, free
AAspire
POST /chem/molar-volume-at-stp$0.002
⚙️ Developer UtilitiesFree
Molarity to mass percent calculator
M, density & MM to % w/w
Aabuela
POST /chem/molarity-to-mass-percent$0.002
⚙️ Developer UtilitiesFree
Molarity to normality calculator
N = M × equivalents per mole
Aabuela
POST /chem/molarity-to-normality$0.002
⚙️ Developer UtilitiesFree
Mole fraction calculator
x_i from component moles free
AAspire
POST /chem/mole-fraction$0.002
⚙️ Developer UtilitiesFree
Mole fraction to molality calculator
convert x to m, free
PPavilion
POST /chem/mole-fraction-to-molality$0.002
⚙️ Developer UtilitiesFree
Mole fraction to molarity calculator
M from x, ρ free
AAspire
POST /chem/mole-fraction-to-molarity$0.002
⚙️ Developer UtilitiesFree
Gas volume ratio calculator
stoichiometric volumes from coefficients, free
PPavilion
POST /chem/mole-ratio-gas-volumes$0.002
⚙️ Developer UtilitiesFree
Mole to mole conversion calculator
product moles from coefficients free
AAspire
POST /chem/mole-to-mole-conversion$0.002
⚙️ Developer UtilitiesFree
Molecular formula calculator
empirical formula to molecular formula from molar mass free
AAspire
POST /chem/molecular-formula$0.002
⚙️ Developer UtilitiesFree
Molecular formula from empirical calculator
multiplier n = M / M_emp free
AAspire
POST /chem/molecular-from-empirical$0.002
⚙️ Developer UtilitiesFree
Moles to grams calculator
mass ↔ moles via molar mass, free
PPavilion
POST /chem/moles-from-mass$0.002
⚙️ Developer UtilitiesFree
Moles from molarity and volume calculator
n = M×V free
AAspire
POST /chem/moles-from-molarity-volume$0.002
⚙️ Developer UtilitiesFree
Most probable molecular speed calculator
v_mp = √(2RT/M) free
AAspire
POST /chem/most-probable-speed$0.002
⚙️ Developer UtilitiesFree
Nernst equation calculator
cell potential from E°, n, Q, free
Aabuela
POST /chem/nernst-equation$0.002
⚙️ Developer UtilitiesFree
Neutralization moles calculator
excess reagent from C and V
Aabuela
POST /chem/neutralization-moles$0.002
⚙️ Developer UtilitiesFree
Normality calculator
equivalents per liter of solution free
AAspire
POST /chem/normality$0.002
⚙️ Developer UtilitiesFree
Normality to molarity calculator
M = N / n free
AAspire
POST /chem/normality-to-molarity$0.002
⚙️ Developer UtilitiesFree
Number of atoms in sample calculator
N = (m/M)·N_A·n free
AAspire
POST /chem/number-of-atoms-in-sample$0.002
⚙️ Developer UtilitiesFree
Osmolarity from osmotic pressure calculator
c = π/(RT) free
AAspire
POST /chem/osmolarity-from-osmotic-pressure$0.002
⚙️ Developer UtilitiesFree
Osmotic pressure calculator
π = iCRT from concentration, T, and van 't Hoff factor
PPavilion
POST /chem/osmotic-pressure$0.002
⚙️ Developer UtilitiesFree
Osmotic pressure from molarity calculator
π = iMRT free
AAspire
POST /chem/osmotic-pressure-from-molarity$0.002
⚙️ Developer UtilitiesFree
Osmotic pressure difference calculator
Δπ = (c₁−c₂)RT free
AAspire
POST /chem/osmotic-pressure-two-solutions$0.002
⚙️ Developer UtilitiesFree
Partial pressure at new temperature calculator
p2 from p1, T1, T2 free
AAspire
POST /chem/partial-pressure-change-temperature$0.002
⚙️ Developer UtilitiesFree
Partial pressure from mole fraction calculator
p_i = x_i·P free
AAspire
POST /chem/partial-pressure-from-mole-fraction$0.002
⚙️ Developer UtilitiesFree
Particles to grams calculator
mass from count and molar mass, free
PPavilion
POST /chem/particles-to-grams$0.002
⚙️ Developer UtilitiesFree
Parts per thousand calculator
‰ from solute and total mass, free
Aabuela
POST /chem/parts-per-thousand$0.002
⚙️ Developer UtilitiesFree
Element percent by mass calculator
% composition from element mass and molar mass, free
PPavilion
POST /chem/percent-composition-element$0.002
⚙️ Developer UtilitiesFree
Percent dissociation calculator
% at equilibrium from C₀ and Ceq, free
Aabuela
POST /chem/percent-dissociation-equilibrium$0.002
⚙️ Developer UtilitiesFree
Percent ionization of acid calculator
% from C and Ka, free
Aabuela
POST /chem/percent-ionization$0.002
⚙️ Developer UtilitiesFree
Percent purity calculator
pure mass over sample mass, free
PPavilion
POST /chem/percent-purity$0.002
⚙️ Developer UtilitiesFree
Percent solution prep calculator
solute and solvent mass free
AAspire
POST /chem/percent-solution-prep$0.002
⚙️ Developer UtilitiesFree
Mass percent to molarity calculator
% w/w, density & MM to M
Aabuela
POST /chem/percent-w-w-to-molarity$0.002
⚙️ Developer UtilitiesFree
Percent yield calculator
actual vs theoretical product mass, free
PPavilion
POST /chem/percent-yield-from-masses$0.002
⚙️ Developer UtilitiesFree
pH calculator
pH from hydrogen ion concentration [H+], free
PPavilion
POST /chem/ph-from-concentration$0.002
⚙️ Developer UtilitiesFree
pH from pOH calculator
pH = 14 − pOH at 25 °C, free
PPavilion
POST /chem/ph-from-poh$0.002
⚙️ Developer UtilitiesFree
pH to pOH calculator
pOH, [H+] and [OH−] at 25 °C
Aabuela
POST /chem/ph-poh-convert$0.002
⚙️ Developer UtilitiesFree
Weak acid pH calculator
approximate pH from concentration and Ka or pKa free
AAspire
POST /chem/ph-weak-acid$0.002
⚙️ Developer UtilitiesFree
Weak base pH calculator
pH from concentration and Kb, free
PPavilion
POST /chem/ph-weak-base$0.002
⚙️ Developer UtilitiesFree
pKb from Kb calculator
pKb = −log10(Kb), free
Aabuela
POST /chem/pkb-from-kb$0.002
⚙️ Developer UtilitiesFree
pOH calculator
pOH and pH from [OH−] at 25 °C free
AAspire
POST /chem/poh$0.002
⚙️ Developer UtilitiesFree
pOH calculator
pOH from hydroxide ion concentration [OH−], free
PPavilion
POST /chem/poh-from-hydroxide$0.002
⚙️ Developer UtilitiesFree
PPB to molarity calculator
convert ppb to M with density, free
PPavilion
POST /chem/ppb-to-molarity$0.002
⚙️ Developer UtilitiesFree
PPM calculator
parts per million from solute mass free
AAspire
POST /chem/ppm-concentration$0.002
⚙️ Developer UtilitiesFree
PPM to mg/L calculator
concentration from density free
AAspire
POST /chem/ppm-to-mg-per-liter$0.002
⚙️ Developer UtilitiesFree
PPM to molarity calculator
convert ppm and molar mass to mol/L
Aabuela
POST /chem/ppm-to-molarity$0.002
⚙️ Developer UtilitiesFree
PPM to PPB converter
parts per million to billion and trillion
Aabuela
POST /chem/ppm-to-ppb$0.002
⚙️ Developer UtilitiesFree
Pseudo-first-order rate constant calculator
k' from k and excess, free
Aabuela
POST /chem/pseudo-first-order$0.002
⚙️ Developer UtilitiesFree
Radioactive decay calculator
remaining quantity N(t)=N0·e^(−λt) free
AAspire
POST /chem/radioactive-decay$0.002
⚙️ Developer UtilitiesFree
Raoult's law vapor pressure calculator
P = x·P° free
AAspire
POST /chem/raoult-law-vapor-pressure$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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Balance
$10.00+

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