Password Entropy Calculator
Estimate theoretical password entropy from length and character-set assumptions.
Free browser-based utilities
Calculate, convert, count, generate, and check answers quickly. Every tool works directly in your browser with no account required.
Newest additions, ready to use.
Estimate theoretical password entropy from length and character-set assumptions.
Convert length among millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles.
Choose one or more random entries from your own list without replacement.
Calculate a semester GPA from course credits and grade points using a configurable course table.
Estimate concrete volume in cubic yards and the number of premixed bags for a rectangular slab.
Calculate percentage increase or decrease from an original value to a new value.