Is this online coin toss really random?

Yes. Each flip uses the browser's Math.random() to pick heads or tails with a 50/50 split. There is no memory of previous flips - a long streak of heads does not make tails 'due' on the next flip. That's the gambler's fallacy. Over many flips your heads/tails count will converge toward 50/50, but any individual flip is independent.

How do I flip a coin online?

Click the Flip the Coin button (or press Space). The coin spins for about a second and lands on heads or tails. Your stats, streaks, and history update automatically and are saved in your browser.

What is prediction mode?

Prediction mode lets you call heads or tails before each flip. If the coin lands on your call, it counts as a win and adds to your prediction streak. Over enough flips a fair coin will reward you about 50% of the time, but it's a fun way to play hot-hand against the universe.

What is the longest streak of heads in a row?

The probability of a streak of n heads in a row is 1 in 2^n. So 10 heads in a row is about 1 in 1024 flips - rare but very possible. The best streak this page records is the longest run of the same side in your personal history, saved across visits.

Flip a Coin

Free online coin toss with live stats, streaks, and a chart of every flip. Click the coin or press Space to flip.

Prediction mode (call it before the flip)

H HEADS

T TAILS

Tap the coin or hit Flip

Press Space, H, or T to flip.

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Heads 0

Tails 0

Current Streak —

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Best Tails Run 0

Heads vs Tails

Heads Tails

Heads & Tails Counts

Recent Flips

No flips yet — tap the coin to start.

Free Online Coin Toss

This is a free online coin toss for whenever you need to flip a coin and don't have one handy. Click the big coin, press Space, or hit the Flip the Coin button - the coin spins for about a second and lands on heads or tails. Every flip updates your live stats and saves to your browser, so you can flip a hundred times in a row and watch the long-run 50/50 split emerge in the chart.

How to Flip a Coin Online

Click the coin - Or hit the Flip the Coin button, or press Space
Watch it spin - The coin rotates several times and lands on either heads or tails
Read the result - The result appears under the coin and is added to your stats
Keep flipping - There is no flip limit. Stats and history are stored locally in your browser.

Prediction Mode

Turn on Prediction mode at the top of the page to call heads or tails before the flip. Two buttons replace the single Flip the Coin button - one for heads, one for tails. Click your call, the coin flips, and the result is judged against your prediction. A green "You called it!" means you matched; red "Missed" means you didn't. Over time the Call Win Rate stat converges to 50% against a fair coin, but in the short run it's a satisfyingly stupid hot-hand game.

What the Stats Show

Flips - Total number of times you've tossed the coin on this device
Heads / Tails - Running totals for each side
Current Streak - How many of the same side just landed in a row
Best Heads Run / Best Tails Run - The longest unbroken streak of each side
Heads vs Tails Donut - Live proportion with the current heads % in the center
Heads & Tails Counts - Bar chart of total flips per side
Recent Flips - Last 60 flips as a strip of H/T cells, newest on the right
Call Win Rate - (Prediction mode only) Wins divided by total calls

Is This Online Toss Random?

Yes. Each flip uses JavaScript's Math.random() to pick a uniform value, which maps to heads if it's below 0.5 and tails otherwise. Every flip is independent - the coin has no memory of what just happened. Over many flips your heads/tails counts converge toward 50/50, but any single flip is a true 50/50. A run of ten heads in a row does not make tails "due" - that's the gambler's fallacy.

How Long Can a Streak Get?

The probability of n heads in a row is 1 in 2ⁿ. So:

5 heads in a row - About 1 in 32 attempts
7 heads in a row - About 1 in 128
10 heads in a row - About 1 in 1,024 - rare but very possible over an evening of flipping
15 heads in a row - About 1 in 32,768 - hit one of these and you've got bragging rights
20 heads in a row - About 1 in 1,048,576 - functionally a lottery ticket

The Best Heads Run and Best Tails Run stats track your personal records.

What People Use a Coin Toss For

Settling decisions - "Heads we get pizza, tails we get burgers"
Sports kickoffs - The original use case for a coin toss
Tie-breaking - Anywhere you need a fast, fair, binary decision
Random sampling - Picking between two paths in a study
Teaching probability - Watching the long-run 50/50 split appear is a great classroom demo
Just because - Sometimes you want to flip a coin and there isn't one in the room

Where Your Stats Live

Everything on this page is stored in your browser's local storage. Nothing leaves your device. Use Reset Stats to wipe everything and start fresh.