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Calculator Guide

Our unit conversion calculators provide instant, accurate results for any measurement conversion need.

  • Select a category from the grid below
  • Choose your source and target units
  • Enter a value and get instant results
  • Use the swap button to reverse direction

Common conversions: Length, Weight, Temperature

Science & Engineering: Force, Pressure, Energy, Electricity

Specialty tools: Beam Deflection, Circuit Analysis, Thermodynamic Properties

Everyday: Culinary, Date-Time, Health & Fitness

  • Bookmark frequently used converters for quick access
  • Use the search bar on the homepage to find any conversion instantly
  • Check the conversion formula section to understand the math
  • Use reference tables for quick lookups without calculating

Unit Conversion Calculators

Access our complete suite of professional unit conversion tools. From everyday measurements like length, weight, and temperature to specialized engineering and science calculators — find the right tool for any conversion need. Calculators are free and run in IEEE 754 binary64; displayed results are rounded for readability.

How factors are sourced, how the library is updated, and how IEEE 754 rounding is treated are documented on the About page.

Popular pair converters

Direct links to the most-used published conversion pages — length, weight, temperature, speed, and more.

Featured Calculators

Specialized tools for engineering, science, and health professionals.

Beam Deflection Calculator

Calculate beam deflection for simply supported, cantilever, and fixed beams under various loading conditions.

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Circuit Analysis Calculator

Analyze electrical circuits using Ohm's law. Calculate voltage, current, resistance, and power.

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Thermodynamic Properties

Calculate thermodynamic properties like density, specific heat, and thermal conductivity for common substances.

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Health & Fitness Calculator

Calculate BMI, BMR, daily calorie needs, body fat percentage, and other health metrics.

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Aviation Converters

Pilot tools for fuel weight, Mach/TAS, CAS/TAS, altimeter settings, flight levels, NM distance, crosswind, and RVR.

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Aviation Fuel Weight

Convert Jet A, AVGAS, and Jet B fuel liters or gallons to pounds and kilograms for weight-and-balance planning.

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Mach to TAS

Convert Mach number to true airspeed using outside air temperature or ISA altitude.

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Shipping Converters

Freight tools for TEU/FEU, chargeable weight, container load planning, revenue tons, voyage time, and bunker fuel.

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Container TEU / FEU

Convert 20′, 40′, 40′ HC, and 45′ containers to TEU/FEU with typical internal CBM and payload.

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Browse All Categories

Explore our complete collection of unit conversion tools organized by category.

Length

Meters, feet, inches, km, miles

Weight & Mass

Kilograms, pounds, ounces, grams

Temperature

Celsius, Fahrenheit, Kelvin

Area

Square meters, acres, hectares

Volume

Liters, gallons, cups, fluid ounces

Speed

mph, km/h, m/s, knots

Energy

Joules, calories, kWh, BTU

Power

Watts, horsepower, BTU/h

Force

Newtons, pound-force, dynes

Pressure

Pascal, bar, PSI, atm

Electricity

Volts, amps, ohms, farads

Magnetism

Tesla, gauss, weber, henry

Light

Lumens, lux, candela

Sound

Decibels, sound pressure levels

Radiation

Gray, sievert, becquerel, rem

Heat

Thermal conductivity, heat capacity

Fluid

Flow rate, viscosity, surface tension

Engineering

Acceleration, density, torque

Angle

Degrees, radians, gradians

Numbers

Binary, octal, hex, Roman numerals

Typography

Points, pixels, em, rem

Data Transfer

MB/s, Gbps, transfer rates

Date-Time

Date calculations, time zones

Case

camelCase, snake_case, PascalCase

Culinary

Cups, tablespoons, teaspoons

Fuel Consumption

MPG, L/100km, km/L

Prefix

SI prefixes, binary prefixes

Health & Fitness

BMI, BMR, calories, fitness

Calculator FAQs

Find answers to common questions about our conversion calculators.

What unit conversions can I do on this site?

AllUnitConversions.com offers 26+ categories of unit converters including length, weight, temperature, volume, speed, energy, pressure, power, electricity, magnetism, light, sound, radiation, heat, fluid dynamics, engineering, force, angle, data transfer, typography, numbers, date-time, case conversion, culinary, fuel consumption, and prefix conversions.

How accurate are these conversion calculators?

Calculations use IEEE 754 binary64 (JavaScript Number), which has about 15–17 decimal digits of significand. Displayed results are usually rounded for readability. Conversion factors follow published SI and customary definitions from sources such as NIST and BIPM. See the About page for sources, update cadence, and limits.

Can I use these converters on mobile devices?

Yes, all our conversion calculators are fully responsive and work on any device — smartphones, tablets, laptops, and desktops. The interface adapts to your screen size for optimal usability.

Are there specialty calculators beyond basic unit conversion?

Yes, we offer specialty calculators including a Beam Deflection Calculator for structural engineering, a Circuit Analysis Calculator for electrical engineering, a Thermodynamic Property Calculator for physics, and a Health & Fitness Calculator for BMI, BMR, and calorie calculations.

How do I convert between metric and imperial units?

Select the category (e.g., Length), choose your source unit (e.g., meters), enter your value, and select the target unit (e.g., feet). The result appears instantly. You can also use the swap button to reverse the conversion direction.

Is this service free to use?

Yes, all conversion calculators on AllUnitConversions.com are completely free to use. No signup, no registration, no limits. Just visit the page and start converting.

Popular pair converters

Direct links to the most-used published conversion pages — length, weight, temperature, speed, and more.

Popular pair converters