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Calculators & Conversion Tools

OCPL ROI Calculator

OCPL's return on investment [ROI] calculator. Get the value of all OCPL services.

Calculator.com—Online Scientific Calculator

Consumer Price Index Calculator
From the Federal Reserve Bank of Minneapolis. Uses the Consumer Price Index to calculate inflation rates and the value of a dollar from 1913 to 2004.

FXConverter: 164 Currency Converter
This site converts over 164 foreign currencies.

How Many? A Dictionary of Units of Measurement

How Much is That?
Several types of historical currency converters and inflation rate and purchasing power calculators. Historical economic conversions for the U.S. dollar and British pound.


"Convert just about anything to anything else." This site converts measurements of length, weight, force, energy, speed, volume, currency, clothing sizes in different countries, astronomical units, BMI, Morse Code and more. It includes a fun section for conversions like Roman numerals, your age in minutes and seconds, or the height of horses.

Science Made Simple Conversions
U.S. customary and metric conversions for unit measurements.

Universal Currency Converter
Another currency exchange rate calculator.

Yahoo! Reference: Weights and Measures
Performs conversions with area, length, volume, weight and mass.

Last updated: April 27, 2010