Math Tools
Random Number
Generator
Generate random numbers instantly. Single number, bulk sets, unique non-repeating numbers, dice roller, and coin flipper — with full generation history.
Generate Random Numbers
min
max
Your Random Number
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Range: 1 – 100
🎲 Click to regenerate
🎲 Quick Tools
Roll D6 (1–6)
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Roll D20 (1–20)
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Roll D100
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Flip a Coin
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Lottery (6 of 1–49)
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Yes or No?
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Generation History
No history yet
About This Random Number Generator
This generator uses JavaScript's Math.random() to produce pseudo-random numbers — values that appear statistically random, drawn from a uniform distribution. Every number in your specified range has an equal probability of being selected.
Use Cases
Random number generators are used in: lottery number selection, statistical sampling, game mechanics, password generation, scientific simulations, shuffling lists, and decision-making (when you just can't choose).
Are these numbers truly random?
They are pseudo-random — generated by a deterministic algorithm (Mersenne Twister or xorshift, depending on the browser) seeded from system entropy. This is sufficient for games, sampling, and everyday use. For cryptographic purposes (passwords, security tokens), use window.crypto.getRandomValues() which draws from true hardware entropy sources.
What is a unique number set?
A unique set picks multiple numbers from a range without repetition — like drawing cards without replacement. For example, 6 unique numbers from 1–49 simulates a lottery draw. The pool size (max − min + 1) must be at least as large as the count you're picking. If you ask for 10 unique numbers from a range of only 5, it's mathematically impossible.
What does "bulk" generation do?
Bulk mode generates multiple independent random numbers (up to 500) in the specified range. Numbers can repeat (with replacement). This is useful for statistical sampling, creating test data, or rolling multiple dice simultaneously. Use "Unique Set" mode if you need non-repeating numbers.