Exponential Distribution CDF Calculator
Calculate exponential probability P(X ≤ x) = 1 − exp(−λx).
Open toolEvaluate exponential density λ exp(−λx). Positive rate and nonnegative x.
Enter the inputs, then select Calculate.
Result will appear here
Evaluate exponential density λ exp(−λx).
Positive rate and nonnegative x. A density is not a point probability. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
Follow the labelled inputs.
Replace the example with nonnegative value x. The field labels specify the expected format and units.
Select Calculate. Review the calculated result, then copy it or download the result text.
The starting example produces 0.270670566473. Evaluate exponential density λ exp(−λx).

Read the labels for nonnegative value x and rate λ. Positive rate and nonnegative x.

Copy the calculated result into your notes. Keep the formula and assumptions with it if someone else needs to reproduce the calculation.

Read the units and assumptions with the output.
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Positive rate and nonnegative x. A density is not a point probability. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
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Positive rate and nonnegative x. A density is not a point probability. Inputs and results use floating-point numbers and may be rounded. Results show up to 12 significant digits.
Copy result copies the displayed text. Download saves the same text as a TXT file. Processing runs in this browser without an account.
Check the calculated result, then copy or download it.