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Exponential Distribution Calculator

Compute exponential-distribution probabilities for waiting times from the rate λ, including P(X≤x), P(X>x) and a range.

Related tools

All Statistics & probability tools →
Beta Distribution CalculatorCompute beta-distribution probabilities on [0,1] from shape parameters α and β via the regularized incomplete beta function.Gaussian Distribution GeneratorNormally-distributed numbers via Box–Muller, with an optional seed and the sample mean and SD.Geometric Distribution CalculatorCompute the probability of the first success on trial k (or after k failures) from the per-trial success probability p.Hypergeometric Distribution CalculatorCompute hypergeometric probabilities of drawing k successes in n draws without replacement from a population of N with K successes.Negative Binomial Distribution CalculatorProbability of reaching the r-th success, counted either in failures before it or in total trials, with both parameterisations kept distinct.Normal Distribution CalculatorCompute normal probabilities P(X≤x), P(X>x), P(a≤X≤b) or find x for a percentile, from the mean and standard deviation.Weibull Distribution CalculatorCompute Weibull reliability probabilities F(x) and R(x) for failure analysis from the shape β and scale η.Poisson distribution calculatorThe probability of exactly k events when they happen at an average rate λ per interval, independently — P(X=k) = e^(−λ)·λ^k / k!. It returns the exact probability, the cumulative P(X≤k), the tail P(X≥k), and reminds you that the mean and variance both equal λ.

Exponential Distribution Calculator works straight from this page — free, instant, nothing to install. It sits under Statistics & probability in our catalogue, alongside Beta Distribution Calculator and Gaussian Distribution Generator.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does Exponential Distribution Calculator do?

Compute exponential-distribution probabilities for waiting times from the rate λ, including P(X≤x), P(X>x) and a range.

When would I actually use this?

Summarising a dataset before drawing conclusions from it, checking whether a difference between two groups is real, and putting an interval around an estimate.

What is the most common mistake?

Reading a p-value as the probability that the hypothesis is wrong. It is the probability of seeing data at least this extreme if the null were true — a different statement, and a much weaker one.

How is Exponential Distribution Calculator different from Beta Distribution Calculator?

They sit next to each other but answer different questions: Beta Distribution Calculator is the one to open when you need it to compute beta-distribution probabilities on [0,1] from shape parameters α and β via the regularized incomplete beta function. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Gaussian Distribution Generator is the closest one after this: Normally-distributed numbers via Box–Muller, with an optional seed and the sample mean and SD.

What else is worth having open alongside it?

Geometric Distribution Calculator and Hypergeometric Distribution Calculator — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

Distributions and test statistics are computed from their standard definitions, not from a lookup table, so results carry more digits than a printed table would. The assumptions each test makes are stated with it.

Further reading

All guides →
ExplainerA 1 % Drop Rate Does Not Mean One Hundred RunsAt 1 %, a hundred attempts give you 63.4 % — not certainty. Ninety per cent takes 230 attempts and ninety-nine takes 459, and more than a third of players are still empty-handed at a hundred.ExplainerWhat Is a Z-Score? Standard Deviations Above the MeanA z-score is z = (x − μ) / σ — how many standard deviations a value sits from the mean. Learn how to compute it, read the standard normal curve, and turn it into a percentile.ExplainerMean, Median and Mode: What's the Difference?Mean, median and mode all describe the 'middle' of your data — but answer different questions. Here's what each means, with examples and when to use which.ExplainerGeometric vs Arithmetic Mean: Which to UseThe arithmetic mean adds and divides; the geometric mean multiplies and takes a root. Learn which fits growth rates, ratios, and averages.How-toHow to Calculate Standard Deviation (Step by Step)Standard deviation measures how spread out your data is. Here's the formula, a worked example, and the difference between population and sample.ExplainerProbability Basics, With ExamplesProbability measures how likely something is, from 0 to 1. Here's the basic idea, how to combine events with AND and OR, and the complement.