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Simple Calculator on Caithness.org

Handy Metric Imperial Convertor

Simple Scientific Calculator on Caithness.org

Currency Convertor 

Convert From/To 

Savings & Mortgages

Utility Bills

Calendar Convertor

lots of calculators on many topics

Reference Desk

Weights & Measures Resources

Use Google to evaluate mathematical expressions.
To use Google's built-in calculator function, simply enter the expression you'd like evaluated in the search box and hit the Enter key or click the Google Search button. The calculator can evaluate mathematical expressions involving basic arithmetic (5+2*2 or 2^20), more complicated math (sine(30 degrees) or e^(i pi)+1), units of measure and conversions (100 miles in kilometers or 160 pounds * 4000 feet in Calories), and physical constants (1 a.u./c or G*mass of earth/radius of earth^2). You can also experiment with other numbering systems, including hexadecimal and binary.

This Is Money Comparison Calculators
What is the best interest rate, best telephone, electricity, gas rates and much more

When Calculators Are OK
A reply suggesting when children should be allowed to use a calculator and when not for homework.