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Kalker
Use Kalker as a calculator with custom variables, functions, differentiation and integration on desktop, mobile or web.
About Kalker
Kalker is a calculator that supports user-defined variables and functions. It can differentiate with prime notation, integrate over an interval, and work with complex numbers, vectors, matrices, sums, and different number bases. It runs on Windows, macOS, Linux, Android, and in web browsers.
Integrals and derivatives are estimated, and higher-order derivatives can be inaccurate. Root finding is estimated and limited to one root.
Key features
- Define custom variables and functions with parameters
- Differentiate using prime notation, such as f'(3)
- Integrate over an interval, such as integrate(0, pi, sin(x) dx)
- Work with complex numbers, vectors and matrices
- Understand ambiguous syntax such as 2sinx + 2xy
- Calculate sums and use different number bases
Best for: People who need to evaluate custom formulas with variables, functions, and calculus on multiple devices.
Good for
- Runs on Windows, macOS, Linux, Android, and in web browsers
- Supports user-defined variables and functions
- Understands ambiguous syntax such as 2sinx + 2xy
Watch out for
- Root finding is estimated and limited to one root
- Integrals and derivatives are estimated; higher-order derivatives can be inaccurate
- Vector comprehensions are marked as experimental
Kalker at a glance
- Website
- kalker.xyz
- Category
- Research & Data › Research & Study Tools
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Android, Linux, macOS, Web, Windows
- Open source
- Not stated
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Kalker FAQ
How do I define variables and functions?
Use name = value for variables, such as x = 3/4, and name(param1, param2) = value for functions, such as f(x) = 2x+3.
How do I enter special symbols?
Type the function or constant name and press tab, for example sqrt becomes √, pi becomes π, and sum becomes Σ().
How do I change the display number base?
Use the base command, for example base 16 displays output in hexadecimal as well as decimal.
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