» Martindale's Calculators
   An extensive collection of calculators for the sciences, business and everyday measurements. Organized by subject area.
   http://www.martindalecenter.com/Calculators.html

» ABE Volume Calculator Page
   A collection of volumetric calculators for a variety of shapes. Including cylinder sphere barrel pyramid and dome.
   http://grapevine.abe.msstate.edu/~fto/tools/vol/index.html

» Calculate for Free
   Performs basic math operations, as well as square root and percentages. Includes memory save and recall.
   http://www.calculateforfree.com/

» Calculator City
   Includes tools to solve equations like for velocity, density, financial, geometry, algebra, calculus, astronomy, chemistry, physics and webpage color coders. Also, has trivia fact pages, such as state demographics and presidents.
   http://www.1728.com/

» Calculator.com
   Online calculators for a variety of conversions and calculations.
   http://www.calculator.com/

» Conversion of Units
   Database of conversion factors and a calculator.
   http://www.chemie.fu-berlin.de/chemistry/general/units_en.html

» Convertalot
   Collection of free Java measurements converters, calculators, and unit translators.
   http://convertalot.com

» Dario Alpern's Complex Number Calculator
   Computes basic operations, 1/z, pi, exponent, log, trig, and polygamma functions. Includes memory feature.
   http://www.alpertron.com.ar/CALC.HTM

» Hiox Calculator & Converter
   Features calcutors for arithmetic functions, scientific computations, binary conversions, areas, finanical interest, prime numbers, recurring fractions, factoring, matrices, HEX color converter, date and day calculations, as well as for measuring bandwidt
   http://www.easycalculation.com/

» MrCalculator
   Features calculators for arithmetic operations, hexidecimal conversions, camera focus evaluations, finding monthly mortgage payments, color codes, and to make sundials.
   http://www.mrcalculator.com/

» Percent Change Calculator
   Measures the difference in value using percentages. Includes bar graphs with the answer.
   http://www.percent-change.com/

» Physics Calculator
   This RPN calculator implements arithmetic and scientific operations and functions, as well as predefined physical constants.
   http://www.physique.fundp.ac.be/Comp/PhysComp.html

» ScatterMall.com
   Free calculators for science, travel, students, health, education, weather, math, and business. Includes graphing calculators and measurement conversions.
   http://scattermall.com/freetools/