> For the complete documentation index, see [llms.txt](/llms.txt).
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# Science API

29 endpoints — Same auth, same credit pool, same JSON envelope. Use them directly from apps, content sites, workflows, or agents without rebuilding formulas, validation, and docs for each tool.
[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/)
Chemistry
[
Percent Yield Calculator percent-yield-calculator
Solve percent yield, actual yield, or theoretical yield.
1cr · v2026-04-22
](/tools/percent-yield-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/) [
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/)
Physics
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Density Calculator density-calculator
Solve density, mass, or volume with common unit conversions.
1cr · v2026-04-22
](/tools/density-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/) [
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/) [
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/) [
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/)
Pressure
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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
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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
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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/)
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