Qalculate! (GTK UI) 5.13.0

Powerful and easy to use calculator

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About Qalculate! (GTK UI)

Qalculate! is a multi-purpose cross-platform desktop calculator.
It is simple to use but provides power and versatility normally
reserved for complicated math packages, as well as useful tools for
everyday needs (such as currency conversion and percent calculation).

Features include a large library of customizable functions, unit
calculations and conversion, physical constants, symbolic calculations
(including integrals and equations), arbitrary precision, uncertainty
propagation, interval arithmetic, plotting, and a user-friendly interface.

License: GPL-2.0+

Release info	New Release on Oct 04, 2026
Release notes	Changes: o Add temporary check box to function edit dialog o Fix bookmark removed when deleting history item immediately above o Fix segfault when adding bookmark to most recent history item o Fix calculate as you type result cleared or added to history again when history is modified o Fix result containing interval with zero as lower value not displayed automatically o Fix too long lines in history with some fonts o Fix number of decimals for currency quantity when currency is placed before quantity o New function: ymd() (returns the number of calendar years, months, and days between two dates) o Return exact value for more argument values in lambertw() function o Integrate sqrt(ax + b)/x and 1/(x x sqrt(ax2 + bx + c)) o Do not use same "n" variable for different unknown integer values in equation result (e.g. e^e^x = 1) o Solve e^x = ln(x), a x sin(x) = a x tan(x), and a x sin(x) = -a x tan(x) o Solve f(x) = f(x2) and f(x) = -f(x2) for trigonometric functions, and exponentiation o Do not return x = -infinity as solution for a^x = 0 o Fix a = 1 and b = 1 solution for a^x = b when the value of a and b are unknown o Fix uncertainty propagation with duplicate equal data set functions o Fix trigonometric functions with function in argument not calculated when angle unit is not radians o Fix division by zero warning for some expressions with zero quantity (e.g. "1 m x 0 kg") o Fix inconsistent (over)use of secondary exchanges rate sources o Minor bug fixes and feature enhancements
Related tags	arithmetic scientific financial
Listing data	Flathub

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