Probability Calculator
Find event probability from equally likely outcome counts.
Open toolDice Probability Calculator
Find the exact chance of a target sum with identical fair dice. One to 20 independent dice, each with 2–20 consecutively numbered sides.
Free to useNo sign-upRuns in your browser
Enter your details
Enter the inputs, then select Calculate result.
Your result
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Result will appear here
How Dice Probability Calculator works
Find the exact chance of a target sum with identical fair dice.
One to 20 independent dice, each with 2–20 consecutively numbered sides. Uses exact integer counts; target sums outside the possible range return zero.
How to use Dice Probability Calculator
Follow the labelled inputs.
Enter number of fair dice
Replace the example with number of fair dice. The field labels specify the expected format and units.
Input and settings
Check the remaining inputs
Set sides per die, target sum. One to 20 independent dice, each with 2–20 consecutively numbered sides.
Tool result
Run, review and save
Select Calculate result. Review the calculated result, then copy it or download the result text.
Review the details
Examples and uses for Dice Probability Calculator
Check the supplied example
The starting example produces Favorable outcomes: 6; Total outcomes: 36; Probability: 1/6; Percent: 16.6666666667%. Find the exact chance of a target sum with identical fair dice.
Use your own inputs
Read the labels for number of fair dice and sides per die, target sum. One to 20 independent dice, each with 2–20 consecutively numbered sides.
Record a reviewed result
Copy the calculated result into your notes. Keep the formula and assumptions with it if someone else needs to reproduce the calculation.
How to read the result
Read the units and assumptions with the output.
Find the exact chance of a target sum with identical fair dice.
One to 20 independent dice, each with 2–20 consecutively numbered sides. Uses exact integer counts; target sums outside the possible range return zero.
Supported input and limits
Check the stated scope before you run it.
One to 20 independent dice, each with 2–20 consecutively numbered sides. Uses exact integer counts; target sums outside the possible range return zero.
The input stays in this browser. Copy result and Download save the same displayed text.
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Open toolDice Probability Calculator: common questions
Answers about using Dice Probability Calculator and understanding its results.
Which inputs does this tool accept?
One to 20 independent dice, each with 2–20 consecutively numbered sides. Uses exact integer counts; target sums outside the possible range return zero.
Can I copy or download the result?
Yes. Copy result copies the displayed text, and Download saves the same result as a text file. Calculations run in your browser without an account.
Calculate result with your input
Check the calculated result, then copy or download it.