List of Online Calculators

List of online calculators
Image by 200 Degrees from Pixabay

In the digital age, online calculators have emerged as indispensable tools that provide quick and accurate solutions to various mathematical, scientific, and financial calculations. These versatile tools have revolutionized how we approach complex problems, enabling us to save time, enhance accuracy, and simplify our daily tasks. This article explores a useful list of online calculators available today, highlighting their unique features and benefits.

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

  1. Scientific Calculators: Scientific calculators are invaluable for students, researchers, and professionals in various scientific disciplines. They allow for complex mathematical operations, trigonometric calculations, statistical analysis, and more. Online scientific calculators often offer additional features such as graph plotting, unit conversions, and equation-solving capabilities, making them powerful aids for problem-solving in physics, chemistry, and engineering.
  2. Mortgage and Loan Calculators: Online mortgage and loan calculators provide crucial insights for individuals planning to purchase a home or take out a loan. These calculators can help determine monthly mortgage payments, estimate total interest paid over the loan term, and assess the financial impact of different repayment strategies. Users can make informed decisions about their financial commitments by adjusting variables like loan amount, interest rate, and loan term.
  3. Body Mass Index (BMI) Calculators: Maintaining a healthy lifestyle is a priority for many individuals. BMI calculators are simple tools that help determine if a person’s weight is within a healthy range based on height and weight. Online BMI calculators often provide additional information, such as ideal weight ranges and personalized recommendations for achieving or maintaining a healthy BMI. These calculators play a vital role in promoting awareness of health and wellness.
  4. Currency Converters: In today’s interconnected world, currency converters are essential for international travelers, businesses, and investors. Online currency converters allow instant conversion between currencies, helping users calculate accurate exchange rates. With real-time updates and historical data, these calculators enable users to stay informed about fluctuations in exchange rates and make informed financial decisions.
  5. Retirement Calculators: Preparing for retirement requires careful planning and considering various factors, such as income, savings, and investment returns. Online retirement calculators simplify this process by providing projections and estimating the amount needed for a comfortable retirement. By inputting variables such as current savings, desired retirement age, and expected rate of return, individuals can gain insights into their retirement goals and make adjustments to ensure financial security.
  6. Distance and Travel Time Calculators: Whether planning a road trip or commuting to work, online distance and travel time calculators offer valuable information. These calculators can estimate travel distances, provide optimal routes, calculate travel time based on average speeds, and even consider factors like traffic congestion. Such calculators empower users to plan their journeys effectively, saving time and reducing stress.

List of Calculators and Conversion Websites

Following is a list of various online calculators and online converters. We included various websites to provide access to many tools available.

  • 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 that converses between many common (and not-so-common) units. Calculations include 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 site is an online metric converter that gives U.S. customary and metric conversions. The site includes 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 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 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 regularly. 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; sometimes, those numbers must be converted from one measurement system to another. Utilize the tools below to convert data from one format to another.


Online calculators have revolutionized how we approach mathematical, scientific, financial, and everyday calculations. They empower users with efficiency, accuracy, and convenience, eliminating the need for manual computations and reducing the margin of error. From scientific calculations to financial planning and travel logistics, these calculators provide invaluable assistance across various domains. Embracing the power of online calculators unlocks a world of efficiency and accuracy, enabling us to tackle complex tasks easily and confidently in the digital age.

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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