A Vim plugin that provides a convenient interactive calculator inside a buffer.
Python Vim script Makefile
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fedorenchik Merge pull request #2 from tracyone/master
add <c-p> and <c-n> keymapping
Latest commit fab884d Apr 21, 2018



This is port of VimCalc (https://github.com/gregsexton/VimCalc) to Python 3. Some of the Vims out there have only +python3, hence this port (of very useful plugin).


VimCalc3 provides a convenient way to access a powerful interactive calculator whilst inside a Vim session. Quickly rattle off a few sums to test an idea. Perform complex calculations using built-in functions to validate answers. Quickly and simply convert from octal to hex to decimal and back again. Setup a bunch of variables to be used in a complex expression. Change variables easily and then simply re-evaluate the expression. Whatever you may need a calculator for, VimCalc3 is up to the task.

Not only can VimCalc3 calculate but it uses Vim for input and editing. Quickly and easily perform edits on previous calculations using the power of Vim and then re-evaluate them by simply hitting return. Once you've got the answers yank them into several registers and paste with ease into other buffers!

Type :Calc to open a new window containing the VimCalc3 buffer.

Here are some example expressions run in a VimCalc3 session:

> 5+4
ans = 9.0
> let x = 4
x = 4.0
> 9 * sqrt(4)
ans = 18.0
> 9**2 - (sqrt(4)+2)
ans = 77.0
> 0xff + 2
ans = 257.0

Here is an example of calculating the roots of a quadratic equation:

> let a = 2
a = 2.0
> let b = -1
b = -1.0
> let c = -6
c = -6.0
> ((b*-1) + sqrt(b**2 - 4*a*c))/(2*a)
ans = 2.0
> ((b*-1) - sqrt(b**2 - 4*a*c))/(2*a)
ans = -1.5



  • Vim 7.0+ with +python3.
  • Python 3 installed.

If you're compiling Vim from source, be sure to use the --enable-python3interp option. Otherwise check your OS's package distro for a version of Vim with Python 3 support. On OS X the best option is MacVim. VimCalc3 should work on Windows too, you will need to install the correct python 3 dll for the version of Vim you are using. Please see the web for help with this.


Use your favourite package manager for Vim.

If you don't have a preferred installation method, I recommend using Vim's native package management support, simply copy and paste:

mkdir -p ~/.vim/pack/bundle/start
cd ~/.vim/pack/bundle/start
git clone https://github.com/fedorenchik/VimCalc3.git