Sometimes you need to know the length of a curve for some setups; for a while I sometimes used an addon called jsCurveLength.

However, the way it’s designed relies on the existance of the addon to evaluate. Without it, your rig is broken. I’ve made a version which is self-contained, so when you export your rig you don’t need to tell people to install any addon.

Select your curve(s) and run this code from either a button or the Script Editor. Here’s the JavaScript:

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