Free tape calculator software for windows

Calcute is a Free, Compact yet Capable Calculator. Features: Process sequences of arbitrarily complex arithmetic expressions like:
-log(1+2) * 3% + sin(4 5/6)^7
Edit previous calculations and re-calculate, cut and paste at will. Save your work to a text file (automatic or manual), restore it later. Compact single-line mode or flexible multi-line mode. Show buttons or hide them. Separately adjustable font and button sizes. Flexible snap-on screen positioning to your preferred location. Enable/disable "always on top" style. Help file included.
Adjust it to suit your preferences: Change the font. Show or hide calculator buttons used with the mouse; adjust their size as well. Switch the work area to single line mode so that it looks like a plain desk calculator. Stretch the window to any size: shrink it down to a small utility window stashed in a corner of your screen, or maximize it in multi-line edit mode for complete editing flexibility. Save the work area contents to a text file. Do this manually or automatically when you exit the program, reload it the same way to continue working where you left off. Past calculations can be modified then recalculated individually.

Date Calculator calculates the number of days between given dates Date Calculator is a free time management tool which will calculate the number of days between given dates.

AVZ Calculator is a simple calculator extension for Firefox.
The extension can be launched just by clicking the dark gray calculator icon in the Firefox status bar

Keeps track of your courses, grades, and calculates your overall current gpa. Great for high school or college students.

The Time Calculator application it was similar designed to a standard calculator, but it works on units of time - ideal for tasks such as working out how many music tracks will fit on a 90 minute tape or an 80 minute CDR, or totalling a series of split times when timing experiments.