The Conversion & Calculation Center is a comprehensive site for converting from one measure to another.
“Convert just about anything to anything else. Over 5,000 units, and 50,000 conversions.”
“... online conversions for different kind of metrics such as length, weight, temperature, area, volume, speed, frequency, light, cooking, currency and many more with pictures to allow easy access the menu items and some explanations.”
EquPlus Online Units Conversion
Organized by area, cooking, energy, etc.
For Inches, fractions, metric, number, and letter drills.
OnlineConversion.com Ring Size Conversion
Ring size with the values in inches and millimeters for diameter. Equivalents to sizes in other countries.
Zales Measure, Determine, Check
Ring size Measure by string, with a paper sizer, or by comparing to circles with size and mm equivalents.
homefair.com part of Move™ The Salary Calculator
"Use this calculator to compare the cost of living in hundreds of U.S. and international cities."
CalculatorPlus.com Finance and Loan Calculators “Comprehensive source of free online calculators: Mortgage loan calculator, Credit card, Insurance, Interest rate, Savings, Retirement, Auto finance.”