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
Calculator.com
lots of calculators on many topics
Reference
Desk
Weights & Measures Resources

Calculator
Use Google to evaluate mathematical expressions.
To use
Google's builtin 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. 