This site is designed to provide a calculator for the chi-squared and normal distributions. See below for notes on how to use the forms.

X | P(X>x) | df | NCP | |

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x | P(X>x) | mean | SD | |

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For central chi-squared distribution, NCP = 0.

i.e. df=1, P(X>x) = 0.05, NCP = 0 gives X = 3.84146

For standard normal distribution, mean = 0, sd = 1

i.e. mean = 0, sd = 1, P(X>x) = 0.025 give X = 1.95996