I would like to perform basic, arbitrary maths without writing a lua function for it.

One (non-working) example might be: ${${loadavg 1}*100)}% If this were possible then many other uses might be imagined.

  • Now that I think about it, 0.16 might actually be my average CPU usage but I'd still like to know how to do basic math in Conky variables.
    – bp.
    Oct 20, 2016 at 7:46

1 Answer 1


The answer depends on how you look at it. If you consider Conky's built-in Lua support and the associated use of Lua to be part of Conky, then yes. Otherwise, no.

Using Lua to do calculations is fairly straightforward. Here's an example Lua file called temps.lua for doing some calculations (I threw in your example, too)...

function conky_F2C(f)
    local c = (5.0/9.0)*(f-32.0)
    return c

function conky_C2F(c)
    local f = c*(9.0/5.0)+32.0
    return f

function conky_acpitempF()
    local c = conky_parse("${acpitemp}")
    return conky_C2F(c)

function conky_loadavg()
    return conky_parse("${loadavg 1}") * 100

At the top of the conky.config section of my .conkyrc file, I put the following...

lua_load = '~/bin/lua_scripts/temps.lua',

And in the conky.text section, I put the following lines...

ACPI Temp... ${acpitemp}°C
Conv to F... ${lua conky_acpitempF}°F

Body Temp... 98.6°C
Conv to C... ${lua conky_F2C 98.6}°C

Load Avg... ${loadavg 1}
Multipliled by 100... ${lua conky_loadavg}%

The resulting display on Conky should appear similar to...

ACPI Temp... 43°C
Conv to F... 109.4°F

Body Temp... 98.6°C
Conv to C... 37°C

Load Avg... 0.28
Multipliled by 100... 28.0%

Note that, as far as I've been able to tell, you can't pass a Conky object like ${loadavg 1} to a Lua function. But you can access an object within a Lua function as in the example code above.

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