Generate random numbers instantly
42
Allow Duplicates
Same number can appear multiple times
Inputs
Result
The formula floor(random() x (100 - 1 + 1)) + 1 produces an integer from 1 to 100. Each number has an equal 1% probability of being selected.
Inputs
Result
Simulates a standard 6-sided die roll. The formula floor(random() x (6 - 1 + 1)) + 1 = floor(random() x 6) + 1 produces an integer from 1 to 6 with equal probability (16.67% each).
Computer-based random number generators use mathematical algorithms called pseudo-random number generators (PRNGs). They use a seed value and formula to produce numbers that appear random and are evenly distributed.
Browser-based generators use pseudo-random algorithms, which are statistically random and suitable for most purposes like games, simulations, and random selections. For cryptographic purposes, more sophisticated methods are needed.
Yes! Set your range to match your lottery (e.g., 1-69 for Powerball), generate multiple numbers without duplicates, and use them for your picks. Remember that all number combinations have equal probability.
With duplicates allowed, the same number can appear multiple times in your results (like rolling dice). Without duplicates, each number can only appear once (like drawing cards from a deck).
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Last Updated: Feb 12, 2026
This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.