Generate random integers or decimals in any range, with optional unique values for draws and raffles.
Numbers come from your browser's built-in random source, which is suitable for games, raffles, sampling and simulations. It is not cryptographically secure — do not use it for passwords or security tokens.
Choosing unique values guarantees no repeats; the maximum count then equals the size of your range.
Yes — set min 1, max to your lottery's ceiling, choose 'No duplicates' and request as many balls as the draw uses.
They are pseudorandom: deterministic sequences that pass casual statistical checks. For most everyday purposes this is indistinguishable from true randomness.
Calculate X% of Y, find what percent one number is of another, and solve percentage increase problems in one place.
Find the percentage increase between an original value and a new value, including the absolute change.
Add, subtract, multiply and divide fractions and mixed numbers, with results automatically simplified.
Find √ of any non-negative number, plus perfect-square detection and nearby roots.
Full expression calculator with parentheses, powers, roots, trigonometry, logarithms and constants π and e.
Test whether a number is prime and see its smallest factors when it isn't.