Regularized Gamma calculator

How to use this calculator

Edit GammaRegularized(shape,endpoint). This is the upper-tail ratio Q(a,z)=Gamma(a,z)/Gamma(a).

Tap the math below to edit it and see the result. Once a result is ready, press Tab on a hardware keyboard to accept it. Outside a matrix, Return completes the line; the phone math keyboard has the same Return action.

Try it here

Interactive tools require JavaScript. You can read the guide and example without it.

What to know

For positive shape and nonnegative endpoint this is an upper-tail probability, not the lower-tail ratio 1−Q.

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