List of Online Calculators


A calculator is a device for performing mathematical calculations. Calculators can come in physical form or can be in the form of software on a computer or mobile device. Some calculating devices have specialized functions and some are completely specialized for particular purposes.

List of Calculators and Conversion Websites

Following is a list of various online calculators and online converters. We included a wide variety of websites to provide access to a large number of tools available on the web.

  • Body Height Weight Converter – The Body, Height and Weight converter website helps you convert from American to metric units and vice versa. Works with Feet, Inches, Pounds, Centimeters and Kilograms. This could be helpful for investigators who need to convert from centimeters to inches, for example.
  • Conversion Factors for Energy Equivalents – The Physics laboratory of the National Institute of Standards and Technology (NIST) sponsors and maintains this reference resource of CODATA-recommended values of fundamental physical restraints. This is a good resource with many different tools. However, the website only provides a few programs.
  • EngNet Engineering Units Converter – Provided by the Engineering Network. This website provides an online calculator which does conversions between a number of common (and not so common) units. Calculations include such categories as acceleration, angles, velocity, length, mass flow, power, pressure, time, temperature, volume, and weight.
  • eFunda: Units and Constants – eFunda is an index page for units, fundamental constants, and currencies. Includes unique tools for converting thermal, magnetic, permeability, hardness, viscosity, and more.
  • Science Made Simple – The Science Made Simple site is an online metric converter that gives U.S. customary and metric conversions. The site includes such forms as area, speed, currency, distance, time, volume, weight, power, pressure, fuel economy, fractions to decimals, metrics, and more.

List of Common Measurements

Liquid Measurements

  • Teaspoon
  • Tablespoon
  • Pint – 16 fluid ounces
  • Quart – two pints
  • Gallon – 4 quarts or 8 pints


  • Twelve inches in a foot
  • Three feet in a yard
  • Mile = 5280 feet or 1760 yards
  • Nautical Mile = 6,076 feet

List of Time Measurements

  • 60 seconds in a minute
  • 60 minutes in an hour
  • 24 hours in a day
  • Seven days a week
  • 52 weeks in a year
  • 28 to 31 days in a month
  • 365 days in a year
  • 12 months in a year
  • Ten 10 years in a decade
  • 1000 years in a millennium

Metric System

  • 1 millimeter = 1/1,000 meter
  • 1 centimeter = 1/100 meter
  • 1 decimeter = 1/10 meter
  • 1 meter (core unit of measurement in the metric system)
  • 1 dekameter = 10 meters
  • 1 kilometer = 1,000 meters

What Do Private Investigators Need to Know?

Private investigators deal with many different types of data on a regular basis. Crime scene investigators analyze evidence and data from a crime scene. Accident investigators analyze data about vehicles and the environment to investigate car accidents.

Case after case, private eyes deal with numbers and sometimes those numbers need to be converted from one measurement system to another. Utilize the tools below to convert data from one format to another as needed.

If you know of a resource that might be helpful to others, please leave a comment below. Also, view more Lists.

Michael Kissiah is the owner of Brandy Lane Publishing, LLC, which owns and operates a small portfolio of websites, including Michael created more than 20 years ago after working as a private investigator in the state of Florida. Since that time, he has become an expert at how to find information online and has written over 1000 articles on topics related to the investigation industry. In addition, he is the author of the "Private Investigator Licensing Handbook", available at



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