Online calculators are online tools for advanced mathematical calculations and graphing. They can be very useful for anyone that uses math, in some cases even becoming a substitute for commercial software.
Calculators :: Hardware
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Calculators :: Software

Martindale's Calculators - An extensive collection of calculators for the sciences, business and everyday measurements. Organized by subject area.
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 bandwidth.
ABE Volume Calculator Page - A collection of volumetric calculators for a variety of shapes. Including cylinder sphere barrel pyramid and dome.
Calculate for Free - Performs basic math operations, as well as square root and percentages. Includes memory save and recall.
Meta Description: [ free online calculators for house and home, car and travel, finance,health and medical, business,engineering, and mathematics. ]
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.
Meta Description: [ Calculator City,
calculators for 2 3 or 4 unknowns, quadratic equations, cubic equations,
quartic equations, 4th degree polynomials, simultaneous equations,
converters for length, distance, area, volume, mass, time, velocity, force, pressure,
energy, power, density, flow (volume/time), flo... ]
Calculator.com - Online calculators for a variety of conversions and calculations.
Meta Description: [ Online calculators for everything. Some solve problems, some satisfy curiosity. ]
Conversion of Units - Database of conversion factors and a calculator.
Convertalot - Collection of free Java measurements converters, calculators, and unit translators.
Meta Description: [ FREE Online Measurements Converters and Calculators ]
Dario Alpern's Complex Number Calculator - Computes basic operations, 1/z, pi, exponent, log, trig, and polygamma functions. Includes memory feature.
Meta Description: [ Features a Javascript complex number calculator. ]
MrCalculator - Features calculators for arithmetic operations, hexidecimal conversions, camera focus evaluations, finding monthly mortgage payments, color codes, and to make sundials.
Online Calculators.net - Features converters and calculators for math, physics, atmospheric science, volume, blood alcohol levels, calendar, physics, and finance.
Meta Description: [ FREE Online Measurements Converters and Calculators ]
Physics Calculator - This RPN calculator implements arithmetic and scientific operations and functions, as well as predefined physical constants.
ScatterMall.com - Free calculators for science, travel, students, health, education, weather, math, and business. Includes graphing calculators and measurement conversions.
Meta Description: [ ScatterMall.com Free Tools Online - All kinds of free tools such as calculators for students and businesses. ]