Each flip is 50/50 using the browser's random. Suitable for games, not cryptographic use.

Can I flip multiple times?

Click again to flip again. Each flip is independent.

Result is shown as Heads or Tails after each flip.

Online Coin Flipper

Flip a virtual coin: random heads or tails. Fair 50/50 outcome.

Is it fair?: Each flip is 50/50 using the browser's random. Suitable for games, not cryptographic use.
Can I flip multiple times?: Click again to flip again. Each flip is independent.
Heads or tails?: Result is shown as Heads or Tails after each flip.

Celsius to Fahrenheit Converter

Convert Celsius to Fahrenheit and Fahrenheit to Celsius instantly. Free temperature converter.

Tip Calculator

Calculate tip and split the bill. Enter bill amount, tip percentage, and number of people.

Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals to numbers. Supports 1–3999.

Combinations Calculator

Calculate C(n,r) — the number of ways to choose r items from n without order. Uses n!/(r!(n-r)!).

Combinations with Replacement Calculator

Calculate the number of ways to choose r items from n with repetition allowed. Formula: C(n+r-1, r).

Even Permutations Calculator

Count how many permutations of n objects are even (expressible as an even number of swaps). For n ≥ 2, equals n!/2.