> For the complete documentation index, see [llms.txt](/llms.txt).
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87 endpoints

# Science API

Same bearer token, same credit pool, same JSON envelope as every other endpoint — drop them into apps, sites, workflows, or agents without rebuilding formulas, validation, or docs.
[Start free →](/billing/checkout/?plan=free) [View OpenAPI](/v1/docs) [All categories](/tools/)
Astronomy
[
Astronomical Unit Converter astronomical-unit-converter
Convert astronomical distances among AU, light-time, parsecs, kilometers, and miles.
1cr · v2026-04-22
](/tools/astronomical-unit-converter/)
Chemical Calculators
[
Dilution Calculator dilution-calculator
Solve M1V1 = M2V2 for stock concentration, stock volume, final concentration, or final volume.
1cr · v2026-04-22
](/tools/dilution-calculator/) [
Empirical Formula Calculator empirical-formula-calculator
Empirical formula from element mass percentages or masses, with optional molecular formula when a molecular mass is supplied.
1cr · v2026-04-22
](/tools/empirical-formula-calculator/) [
Limiting Reactant Calculator limiting-reactant-calculator
Find the limiting reactant, theoretical yield, leftover excess, and percent yield from a balanced equation.
1cr · v2026-04-22
](/tools/limiting-reactant-calculator/) [
Molality Calculator molality-calculator
Calculate molality and colligative freezing and boiling point shifts.
1cr · v2026-04-22
](/tools/molality-calculator/) [
Molar Mass Calculator molar-mass-calculator
Molar mass of a chemical formula with per-element atom count, contribution, and percentage composition, supporting nested parentheses.
1cr · v2026-04-22
](/tools/molar-mass-calculator/) [
Molarity Calculator molarity-calculator
Calculate molarity, solute mass, or solution volume from mass, molar mass, and volume.
1cr · v2026-04-22
](/tools/molarity-calculator/) [
Mole/Gram/Particle Converter mole-gram-particle-converter
Convert among moles, grams, and particles using molar mass and Avogadro's constant.
1cr · v2026-04-22
](/tools/mole-gram-particle-converter/) [
Nernst Equation Calculator nernst-equation-calculator
Calculate electrochemical cell potential under non-standard conditions.
1cr · v2026-04-22
](/tools/nernst-equation-calculator/) [
Osmotic Pressure Calculator osmotic-pressure-calculator
Calculate osmotic pressure from molarity, temperature, and van't Hoff factor.
1cr · v2026-04-22
](/tools/osmotic-pressure-calculator/) [
pKa to Ka Converter pka-to-ka-converter
Convert between pKa, Ka, pKb, and Kb for an acid-base conjugate pair.
1cr · v2026-04-22
](/tools/pka-to-ka-converter/)
Chemistry
[
Beer-Lambert Law Calculator beer-lambert-law-calculator
Solve A = epsilon l c for absorbance, molar absorptivity, concentration, or path length.
1cr · v2026-04-22
](/tools/beer-lambert-law-calculator/) [
Boiling Point Elevation Calculator boiling-point-elevation-calculator
Calculate boiling point elevation from molality, Kb, and van't Hoff factor.
1cr · v2026-04-22
](/tools/boiling-point-elevation-calculator/) [
Chemical Equation Balancer chemical-equation-balancer
Balance a chemical equation by solving the element matrix for the smallest whole-number coefficients.
1cr · v2026-04-22
](/tools/chemical-equation-balancer/) [
Electron Configuration Calculator electron-configuration-calculator
Electron configuration of any element or ion, with noble-gas notation, shells, and valence electrons.
1cr · v2026-04-22
](/tools/electron-configuration-calculator/) [
Freezing Point Depression Calculator freezing-point-depression-calculator
Freezing point depression (delta-Tf = i * Kf * m) from molality or from solute/solvent mass, with a van't Hoff factor for ionic solutes.
1cr · v2026-04-22
](/tools/freezing-point-depression-calculator/) [
Henderson-Hasselbalch Calculator henderson-hasselbalch-calculator
Buffer pH from pKa and the conjugate base/acid ratio, or solve for the ratio or the pKa, via the Henderson-Hasselbalch equation.
1cr · v2026-04-22
](/tools/henderson-hasselbalch-calculator/) [
Percent Yield Calculator percent-yield-calculator
Solve percent yield, actual yield, or theoretical yield.
1cr · v2026-04-22
](/tools/percent-yield-calculator/) [
pH Calculator ph-calculator
pH, pOH, [H+], and [OH-] from any one of them, with acidity classification at 25 C.
1cr · v2026-04-22
](/tools/ph-calculator/)
Electrical
[
Parallel Resistor Calculator parallel-resistor-calculator
Calculate equivalent resistance and current sharing for resistors in parallel.
1cr · v2026-04-22
](/tools/parallel-resistor-calculator/) [
Power Factor Calculator power-factor-calculator
Calculate power factor, reactive power, or capacitor correction values.
1cr · v2026-04-22
](/tools/power-factor-calculator/) [
RC Time Constant Calculator rc-time-constant-calculator
Calculate RC circuit time constant, cutoff frequency, and charging or discharging levels.
1cr · v2026-04-22
](/tools/rc-time-constant-calculator/)
Electronics
[
555 Timer Calculator 555-timer-calculator
Calculate 555 timer astable frequency, period, duty cycle, or monostable pulse width.
1cr · v2026-04-22
](/tools/555-timer-calculator/) [
Capacitor Calculator capacitor-calculator
Calculate capacitor charge, stored energy, reactance, RC timing, or decode ceramic capacitor codes.
1cr · v2026-04-22
](/tools/capacitor-calculator/) [
Decibel (dB) Calculator decibel-db-calculator
Calculate power dB, voltage dB, dB ratios, and dBm/dBW/watt conversions.
1cr · v2026-04-22
](/tools/decibel-db-calculator/) [
Ohm's Law Calculator ohm-s-law-calculator
Calculate voltage, current, resistance, and power from any two known values.
1cr · v2026-04-22
](/tools/ohm-s-law-calculator/) [
Parallel Capacitor Calculator parallel-capacitor-calculator
Calculate equivalent capacitance for capacitors in parallel.
1cr · v2026-04-22
](/tools/parallel-capacitor-calculator/) [
Resistor Color Code Calculator resistor-color-code-calculator
Calculate 4-band, 5-band, and 6-band resistor values from color bands.
1cr · v2026-04-22
](/tools/resistor-color-code-calculator/) [
Resonant Frequency Calculator resonant-frequency-calculator
Calculate LC/RLC resonant frequency, inductance, capacitance, impedance, Q factor, and bandwidth.
1cr · v2026-04-22
](/tools/resonant-frequency-calculator/) [
Series Resistor Calculator series-resistor-calculator
Calculate equivalent resistance for resistors in series.
1cr · v2026-04-22
](/tools/series-resistor-calculator/)
Fluid Mechanics
[
Bernoulli Equation Calculator bernoulli-equation-calculator
Solve one Bernoulli streamline pressure, velocity, or height term.
1cr · v2026-04-22
](/tools/bernoulli-equation-calculator/) [
Reynolds Number Calculator reynolds-number-calculator
Reynolds number with laminar/transitional/turbulent classification using geometry-specific thresholds for pipes, plates, and channels.
1cr · v2026-04-22
](/tools/reynolds-number-calculator/)
Mechanics
[
Belt Length Calculator belt-length-calculator
Calculate open or crossed belt length, wrap angles, and optional belt speed.
1cr · v2026-04-22
](/tools/belt-length-calculator/) [
Bolt Torque Calculator bolt-torque-calculator
Recommended bolt tightening torque and preload for metric sizes and ISO grades, by the short-form K method and VDI 2230.
1cr · v2026-04-22
](/tools/bolt-torque-calculator/) [
Gear Ratio Calculator (Mechanical) gear-ratio-calculator-mechanical
Calculate gear ratio, output RPM, torque, and mechanical advantage.
1cr · v2026-04-22
](/tools/gear-ratio-calculator-mechanical/)
Physics
[
Angular Velocity Calculator angular-velocity-calculator
Convert angular velocity between rad/s, RPM, Hz, deg/s, and period, or derive it from linear speed and radius with tangential and centripetal results.
1cr · v2026-04-22
](/tools/angular-velocity-calculator/) [
Density Calculator density-calculator
Solve density, mass, or volume with common unit conversions.
1cr · v2026-04-22
](/tools/density-calculator/) [
Doppler Effect Calculator doppler-effect-calculator
Observed frequency shift for moving sources and observers, classical for sound or relativistic for light.
1cr · v2026-04-22
](/tools/doppler-effect-calculator/) [
Falling Through Earth Calculator falling-through-earth-calculator
Calculate idealized uniform-density gravity-train travel time and speed.
1cr · v2026-04-22
](/tools/falling-through-earth-calculator/) [
Force Calculator force-calculator
Solve Newton's second law for force, mass, or acceleration with common unit conversions.
1cr · v2026-04-22
](/tools/force-calculator/) [
Heat Transfer Calculator heat-transfer-calculator
Calculate heat transfer by conduction, convection, or radiation.
1cr · v2026-04-22
](/tools/heat-transfer-calculator/) [
Kinetic Energy Calculator kinetic-energy-calculator
Solve kinetic energy, mass, or velocity with KE = 1/2 m v^2 and unit conversions.
1cr · v2026-04-22
](/tools/kinetic-energy-calculator/) [
Lens Equation Calculator lens-equation-calculator
Thin-lens equation solver for image distance, focal length, or object distance with magnification and image properties.
1cr · v2026-04-22
](/tools/lens-equation-calculator/) [
Moment of Inertia Calculator moment-of-inertia-calculator
Area moment of inertia (rectangle, circle, hollow circle, triangle) or mass moment of inertia (rod, cylinder, sphere, hollow cylinder), in SI units.
1cr · v2026-04-22
](/tools/moment-of-inertia-calculator/) [
Momentum Calculator momentum-calculator
Calculate linear momentum and kinetic energy from mass and velocity.
1cr · v2026-04-22
](/tools/momentum-calculator/) [
Pendulum Period Calculator pendulum-period-calculator
Simple pendulum solver for period, length, gravity, or frequency with planet presets and a large-amplitude correction.
1cr · v2026-04-22
](/tools/pendulum-period-calculator/) [
Potential Energy Calculator potential-energy-calculator
Calculate gravitational or elastic potential energy and solve for missing variables.
1cr · v2026-04-22
](/tools/potential-energy-calculator/) [
Projectile Motion Calculator projectile-motion-calculator
Projectile range, max height, flight time, and impact speed/angle from launch speed, angle, height, and gravity.
1cr · v2026-04-22
](/tools/projectile-motion-calculator/) [
Snell's Law Calculator snell-s-law-calculator
Refraction angles, indices, critical angle, and Brewster angle from Snell's law with a built-in material library.
1cr · v2026-04-22
](/tools/snell-s-law-calculator/) [
Specific Heat Capacity Calculator specific-heat-capacity-calculator
Solve Q = m*c*dT for heat, mass, specific heat, or final temperature with a substance library and mixed units.
1cr · v2026-04-22
](/tools/specific-heat-capacity-calculator/) [
Spring Constant Calculator spring-constant-calculator
Hooke's law solver for force, spring constant, or displacement, plus elastic energy and oscillation period.
1cr · v2026-04-22
](/tools/spring-constant-calculator/) [
Stopping Distance Calculator stopping-distance-calculator
Vehicle reaction + braking stopping distance by road condition (dry/wet/snow/ice), km/h or mph.
1cr · v2026-04-22
](/tools/stopping-distance-calculator/) [
Terminal Velocity Calculator terminal-velocity-calculator
Terminal velocity from mass, drag coefficient, area, and fluid density, with object presets and approach-time milestones.
1cr · v2026-04-22
](/tools/terminal-velocity-calculator/) [
Thermal Expansion Calculator thermal-expansion-calculator
Calculate linear, area, or volume thermal expansion for common materials.
1cr · v2026-04-22
](/tools/thermal-expansion-calculator/) [
Torque Calculator torque-calculator
Solve torque, force, lever arm distance, or angle using tau = F r sin(theta).
1cr · v2026-04-22
](/tools/torque-calculator/) [
Velocity Calculator velocity-calculator
Calculate average velocity, distance, time, or relative velocity with distance, time, and speed units.
1cr · v2026-04-22
](/tools/velocity-calculator/) [
Work and Power Calculator work-and-power-calculator
Calculate mechanical work and power with common unit conversions.
1cr · v2026-04-22
](/tools/work-and-power-calculator/) [
Work Calculator work-calculator
Calculate mechanical work from force, distance, and angle.
1cr · v2026-04-22
](/tools/work-calculator/)
Physics Calculators
[
Buoyancy Calculator buoyancy-calculator
Calculate buoyant force, object density, apparent weight, and float/sink verdict.
1cr · v2026-04-22
](/tools/buoyancy-calculator/) [
Coulomb's Law Calculator coulomb-s-law-calculator
Electrostatic force between two point charges via Coulomb's law, solving for force, charge, or distance with dielectric media.
1cr · v2026-04-22
](/tools/coulomb-s-law-calculator/) [
de Broglie Wavelength Calculator de-broglie-wavelength-calculator
Calculate a particle's de Broglie wavelength from velocity or kinetic energy.
1cr · v2026-04-22
](/tools/de-broglie-wavelength-calculator/) [
E=mc² Calculator e-mc-calculator
Convert mass and energy using E=mc² with configurable conversion efficiency.
1cr · v2026-04-22
](/tools/e-mc-calculator/) [
Electricity Calculator electricity-calculator
Solve voltage, current, resistance, and power from any two known Ohm's law values.
1cr · v2026-04-22
](/tools/electricity-calculator/) [
Escape Velocity Calculator escape-velocity-calculator
Calculate escape velocity for preset or custom celestial bodies.
1cr · v2026-04-22
](/tools/escape-velocity-calculator/) [
Gravitational Force Calculator gravitational-force-calculator
Solve Newton's universal gravitation equation for force, mass, or distance.
1cr · v2026-04-22
](/tools/gravitational-force-calculator/) [
Ideal Gas Law Calculator ideal-gas-law-calculator
Solve PV=nRT for pressure, volume, moles, or temperature with unit conversion.
1cr · v2026-04-22
](/tools/ideal-gas-law-calculator/) [
Kepler's Third Law Calculator kepler-s-third-law-calculator
Calculate orbital period and mean velocity from semi-major axis and central mass.
1cr · v2026-04-22
](/tools/kepler-s-third-law-calculator/) [
Photon Energy Calculator photon-energy-calculator
Convert photon wavelength, frequency, and energy using E=hf=hc/lambda.
1cr · v2026-04-22
](/tools/photon-energy-calculator/) [
Time Dilation Calculator time-dilation-calculator
Relativistic time dilation, Lorentz factor, clock rate, and optional length contraction at any sub-light speed.
1cr · v2026-04-22
](/tools/time-dilation-calculator/)
Pressure
[
Bar to PSI Converter bar-to-psi-converter
Convert bar and PSI, including kPa, MPa, atm, torr, inHg, and Pa.
1cr · v2026-04-22
](/tools/bar-to-psi-converter/) [
psi to kPa Converter psi-to-kpa-converter
Convert pounds per square inch to kilopascals and related pressure units.
1cr · v2026-04-22
](/tools/psi-to-kpa-converter/)
Temperature
[
Celsius to Fahrenheit Calculator celsius-to-fahrenheit-calculator
Convert Celsius to Fahrenheit and related temperature scales.
1cr · v2026-04-22
](/tools/celsius-to-fahrenheit-calculator/) [
Celsius to Kelvin Converter celsius-to-kelvin-converter
Convert Celsius to Kelvin and related temperature scales.
1cr · v2026-04-22
](/tools/celsius-to-kelvin-converter/) [
Celsius to Rankine Converter celsius-to-rankine-converter
Convert Celsius to Rankine and related temperature scales.
1cr · v2026-04-22
](/tools/celsius-to-rankine-converter/) [
Fahrenheit to Celsius Calculator fahrenheit-to-celsius-calculator
Convert Fahrenheit to Celsius and related temperature scales.
1cr · v2026-04-22
](/tools/fahrenheit-to-celsius-calculator/) [
Fahrenheit to Kelvin Converter fahrenheit-to-kelvin-converter
Convert Fahrenheit to Kelvin and related temperature scales.
1cr · v2026-04-22
](/tools/fahrenheit-to-kelvin-converter/) [
Fahrenheit to Rankine Converter fahrenheit-to-rankine-converter
Convert Fahrenheit to Rankine and related temperature scales.
1cr · v2026-04-22
](/tools/fahrenheit-to-rankine-converter/) [
Kelvin to Celsius Converter kelvin-to-celsius-converter
Convert Kelvin to Celsius and related temperature scales.
1cr · v2026-04-22
](/tools/kelvin-to-celsius-converter/) [
Kelvin to Fahrenheit Converter kelvin-to-fahrenheit-converter
Convert Kelvin to Fahrenheit and related temperature scales.
1cr · v2026-04-22
](/tools/kelvin-to-fahrenheit-converter/) [
Rankine to Celsius Converter rankine-to-celsius-converter
Convert Rankine to Celsius and related temperature scales.
1cr · v2026-04-22
](/tools/rankine-to-celsius-converter/) [
Rankine to Fahrenheit Converter rankine-to-fahrenheit-converter
Convert Rankine to Fahrenheit and related temperature scales.
1cr · v2026-04-22
](/tools/rankine-to-fahrenheit-converter/)
Unit Converters
[
Energy Converter energy-converter
Convert energy between joules, calories, BTU, watt-hours, electronvolts, ergs, and therms.
1cr · v2026-04-22
](/tools/energy-converter/) [
Power Converter power-converter
Convert power among watts, kilowatts, horsepower, BTU per hour, refrigeration tons, and related units.
1cr · v2026-04-22
](/tools/power-converter/) [
Ultimate Frequency & Wavelength Converter ultimate-frequency-wavelength-converter
Convert between frequency and wavelength using a configurable propagation speed and identify the spectrum band.
1cr · v2026-04-22
](/tools/ultimate-frequency-wavelength-converter/)
Weather
[
Dew Point Calculator dew-point-calculator
Calculate dew point temperature from air temperature and relative humidity using the Magnus formula.
1cr · v2026-04-22
](/tools/dew-point-calculator/) [
Heat Index Calculator heat-index-calculator
Calculate the NWS heat index (apparent temperature) from air temperature and relative humidity.
1cr · v2026-04-22
](/tools/heat-index-calculator/) [
Wind Chill Calculator wind-chill-calculator
Calculate NWS wind chill and frostbite risk from air temperature and wind speed.
1cr · v2026-04-22
](/tools/wind-chill-calculator/)
API OPERATIONAL v1 · OpenAPI 3.1 · MCP 2025-06-18
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