Mini Calculator
A simple 'pocket' calculator with all the basic functions, and that uses very little space in your desktop.
http://www.webxpace.net/cgi-bin/countdown.cgi?minicalc.zip - 95Kb - Download - Screenshot

CLK-Calculator
CLK-Calculator is a software calculator for windows. The program can handle basic operations but can handle complex numbers and vectors as well. Often used constants can be picked out of the library. Additional the program can convert 261 units of measure, work with matrices, offers a formula... And this is not everything at all.
http://www.clk-calculator.de/CLK-Setup.exe - 16Mb - Download - Screenshot

Dovada student calculator
Developed by the Dovada research team, this student calculator is ideal for use in the school, home, office or any engineering or research areas, anywhere scientific calculator or graphic calculator is regularly used or required. Great for that science or maths homework help. ... The student calculator graphically displays many of the standard mathematical formulae and has the ability to edit graphically, lines, circles, triangles and many other standard images, thus providing an insight into the basic structure of mathematic formulae.
http://www.dovada.com.au/downloads/CalcInst.msi - 3Mb - Download - Screenshot

Cosycalc
The main idea of our project is: "Comfort is the first". This calculator is not a scientific or an engineering one. It is a basic calculator for everyday usage. But as it often happens, merits and demerits change their places. When did you use all that scientific or engineering functions? ... But you do remember, how long it takes to launch any installed calculator. ... In that case you can just hide the virtual keyboard panel to minimize a size of the calculator. ... With this calculator: "You even don?
http://www.cosycalc.com/cosycalc.zip - 176Kb - Download - Screenshot

MoneyToys - Rent Vs. Buy Calculator applet
The MoneyToys - Rent Vs. Buy Calculator applet automatically displays financial answers to the basic question of whether one should rent or buy their housing. This applet is designed to provide webmasters with a simple way to add instant interactivity to a web site.
http://www.moneytoys.com/RVB.php - 14Kb - Download - Screenshot

Orneta Calculator for Smartphone 2002
Orneta Calculator is a simple and easy to use application that acts like a standard scientific handheld calculator for Windows Mobile based Smartphone's. Just use your Smartphone when a separate handheld calculator is too much. Enjoy the simple access for quick calculation of difficult problems. ... You can perform any of the standard operations for which you would use a calculator, including basic arithmetic, such as addition and subtraction, as well as functions found on a scientific calculator, such as logarithms and factorials.
http://www.orneta.com/srvc/dl/calculator_sp_2002.exe - 51Kb - Download - Screenshot

Basal Metabolic Rate Calculator
Calculate your BMR. BMR or Basal Metabolic Rate is the number of calories needed for the basic processes of life. BMR Calculator will help you know the number of calories you need daily to maintain your weight. BMR is individual. Your BMR is influenced by a number of factors: gender, age,... BMR Calculator takes into consideration your activity level. ... If you want to lose weight, you can reduce your daily calorie intake by going on a low calorie diet and/or do physical exercises. ... However, make sure you consult your doctor first.
http://www.actabit.com/download/bmr-calculator.exe - 642Kb - Download - Screenshot

Calorie Calculator
Calorie Burn Calculator - Find all possibilities to burn your calories. This handy software will give you insight in all possibilities with almost 100 activities and ways to rationally spend your energy. This ultimate tool will help you to plan your daily workout. ... Using the basic info such as activity, duration and body weight, it will calculate your calorie consumption in seconds giving you the best possible solution to spare your time.
http://www.steadyhealth.com/software/calorie_calculator.exe - 44Kb - Download - Screenshot

Hpmbcalc Hex Calculator
This is a programmable multiple-precision hex calculator with many utilities for you to perform a lot of big number math operations. Key Features: 1. Standard hex calculator: basic math operations; Hex/Dec/Oct/Bin conversion; byte/operand swap; square root, Jacobi symbol calculation. ... Hash/CRC/checksum calculator: MD2, MD4, MD5, SHA, RIPEMD hash algorithm; 16-bit and 32-bit CRC value; message and file support. ... 5. ... Pseudo-random data/prime generator: generate pseudo-random sequence of bits; search for random prime.
http://www.hexprobe.com/hpmbcalc/download/hpmbc332.zip - 1Mb - Download - Screenshot

archCalc
archCalc is a mixed unit decimal and fraction calculator. It allows one to enter dimensions in standard english and metric units of measurement, perform basic calculations, convert between units, keep track of a series of operations, and easily solve for a leg or slope of a right tiangle. ... archCalc works as a standalone calculator or in conjunction with other programs, calculating stair risers in CAD software, or aiding in takeoffs with a spreadsheet. ... archCalc floats above applications allowing one to work with it as if it were a part of the active application.
http://www.cast-db.com/archCalc/ - 1Mb - Download - Screenshot