For the complete documentation index, see llms.txt.

Science API

30 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.

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Astronomy
Astronomical Unit Converterastronomical-unit-converter
Convert astronomical distances among AU, light-time, parsecs, kilometers, and miles.
1cr · v2026-04-22
Chemistry
Percent Yield Calculatorpercent-yield-calculator
Solve percent yield, actual yield, or theoretical yield.
1cr · v2026-04-22
Electronics
555 Timer Calculator555-timer-calculator
Calculate 555 timer astable frequency, period, duty cycle, or monostable pulse width.
1cr · v2026-04-22
Capacitor Calculatorcapacitor-calculator
Calculate capacitor charge, stored energy, reactance, RC timing, or decode ceramic capacitor codes.
1cr · v2026-04-22
Decibel (dB) Calculatordecibel-db-calculator
Calculate power dB, voltage dB, dB ratios, and dBm/dBW/watt conversions.
1cr · v2026-04-22
Resonant Frequency Calculatorresonant-frequency-calculator
Calculate LC/RLC resonant frequency, inductance, capacitance, impedance, Q factor, and bandwidth.
1cr · v2026-04-22
Physics
Density Calculatordensity-calculator
Solve density, mass, or volume with common unit conversions.
1cr · v2026-04-22
Force Calculatorforce-calculator
Solve Newton's second law for force, mass, or acceleration with common unit conversions.
1cr · v2026-04-22
Kinetic Energy Calculatorkinetic-energy-calculator
Solve kinetic energy, mass, or velocity with KE = 1/2 m v^2 and unit conversions.
1cr · v2026-04-22
Potential Energy Calculatorpotential-energy-calculator
Calculate gravitational or elastic potential energy and solve for missing variables.
1cr · v2026-04-22
Torque Calculatortorque-calculator
Solve torque, force, lever arm distance, or angle using tau = F r sin(theta).
1cr · v2026-04-22
Velocity Calculatorvelocity-calculator
Calculate average velocity, distance, time, or relative velocity with distance, time, and speed units.
1cr · v2026-04-22
Work and Power Calculatorwork-and-power-calculator
Calculate mechanical work and power with common unit conversions.
1cr · v2026-04-22
Physics Calculators
Electricity Calculatorelectricity-calculator
Solve voltage, current, resistance, and power from any two known Ohm's law values.
1cr · v2026-04-22
Pressure
Bar to PSI Converterbar-to-psi-converter
Convert bar and PSI, including kPa, MPa, atm, torr, inHg, and Pa.
1cr · v2026-04-22
psi to kPa Converterpsi-to-kpa-converter
Convert pounds per square inch to kilopascals and related pressure units.
1cr · v2026-04-22
Temperature
Celsius to Fahrenheit Calculatorcelsius-to-fahrenheit-calculator
Convert Celsius to Fahrenheit and related temperature scales.
1cr · v2026-04-22
Celsius to Kelvin Convertercelsius-to-kelvin-converter
Convert Celsius to Kelvin and related temperature scales.
1cr · v2026-04-22
Celsius to Rankine Convertercelsius-to-rankine-converter
Convert Celsius to Rankine and related temperature scales.
1cr · v2026-04-22
Fahrenheit to Celsius Calculatorfahrenheit-to-celsius-calculator
Convert Fahrenheit to Celsius and related temperature scales.
1cr · v2026-04-22
Fahrenheit to Kelvin Converterfahrenheit-to-kelvin-converter
Convert Fahrenheit to Kelvin and related temperature scales.
1cr · v2026-04-22
Fahrenheit to Rankine Converterfahrenheit-to-rankine-converter
Convert Fahrenheit to Rankine and related temperature scales.
1cr · v2026-04-22
Kelvin to Celsius Converterkelvin-to-celsius-converter
Convert Kelvin to Celsius and related temperature scales.
1cr · v2026-04-22
Kelvin to Fahrenheit Converterkelvin-to-fahrenheit-converter
Convert Kelvin to Fahrenheit and related temperature scales.
1cr · v2026-04-22
Rankine to Celsius Converterrankine-to-celsius-converter
Convert Rankine to Celsius and related temperature scales.
1cr · v2026-04-22
Rankine to Fahrenheit Converterrankine-to-fahrenheit-converter
Convert Rankine to Fahrenheit and related temperature scales.
1cr · v2026-04-22
Unit Converters
Energy Converterenergy-converter
Convert energy between joules, calories, BTU, watt-hours, electronvolts, ergs, and therms.
1cr · v2026-04-22
Power Converterpower-converter
Convert power among watts, kilowatts, horsepower, BTU per hour, refrigeration tons, and related units.
1cr · v2026-04-22
Ultimate Frequency & Wavelength Converterultimate-frequency-wavelength-converter
Convert between frequency and wavelength using a configurable propagation speed and identify the spectrum band.
1cr · v2026-04-22
Weather
Wind Chill Calculatorwind-chill-calculator
Calculate NWS wind chill and frostbite risk from air temperature and wind speed.
1cr · v2026-04-22