# Dice Roller & Coin Flipper > Roll 1–12 dice (d4–d100, custom sides) with D&D notation, advantage, and exploding dice. Flip up to 100 coins at once — instant, fair, private, no download. A dice roller and coin flipper in one free tool. Roll any number of polyhedral dice using standard notation like 3d6+2 or 2d20kh1, apply advantage, disadvantage, or exploding dice, and flip up to 100 coins with a live heads-or-tails tally. Every result uses a cryptographically secure random source and runs entirely in your browser, so your rolls are fair and stay private. - **Live tool:** https://www.toolnova.org/utilities/dice-roller-coin-flipper - **Category:** Calculators & Converters (https://www.toolnova.org/utilities) - **Price:** Free - **Requirements:** Runs in a modern web browser · No signup · No install ## What this tool does - Dice and coin modes in one tool — switch instantly - Roll 1–12 dice with presets d4, d6, d8, d10, d12, d20, d100 - One-tap quick rolls: d20, 2d6, 4d6kh3, 2d20kh1 and more - Custom dice sides from 2 to 999 for any house rule - D&D notation parser: 3d6+2, 2d20kh1 (advantage), 4d6kh3 (drop lowest) - Advantage / disadvantage and exploding dice support - Live possible-range and average readout for your dice - Success-threshold counting (how many dice beat a target) - Flip 1–100 coins at once with heads/tails tally and streak - Coin analytics: heads %, expected %, and a proportion bar - Cryptographically secure RNG — not Math.random - Roll history, frequency histogram, and min/max/mean/mode stats - Spacebar to roll, plus copy, export, and reset — 100% client-side ## How to use Dice Roller & Coin Flipper 1. **Choose a mode** — Pick Dice to roll polyhedral dice or Coin to flip. The workspace swaps to the right controls for each mode. 2. **Set up your dice or coins** — For dice, choose how many to roll, their sides (or a custom value), and any modifier like +2. For coins, choose how many to flip and whether you want a fair or weighted coin. 3. **Roll or flip** — Press the big Roll/Flip button or hit the Space bar. Results animate in and the total, individual values, and running history update instantly. 4. **Read the results** — See the sum and each die, or the heads/tails split. Use advantage/disadvantage or success-threshold options to reshape the outcome before rolling. 5. **Review, copy, or export** — Open the history panel for a frequency histogram and stats, then copy the result to your clipboard or export it — everything stays on your device. ## Common use cases - Tabletop and D&D players rolling attacks, saves, and skill checks on the fly - Teachers demonstrating probability, randomness, and the law of large numbers - Friends settling a fair coin-flip decision without hunting for loose change - Board-game nights that need quick, unbiased dice without a dice bag - Developers and QA engineers testing random logic and sampling behavior ## About ### One tool for every random roll and flip Skip the physical dice bag and the arguing over whether a coin landed heads or tails. This single tool rolls any combination of dice and flips any number of coins with one tap, giving you a clean, shareable result in milliseconds. It is built for tabletop nights, classroom demos, and everyday 'who goes first' decisions alike. ### Roll dice like a tabletop pro Go beyond a plain six-sided die. Choose 1 to 12 dice, pick standard shapes (d4, d6, d8, d10, d12, d20, d100), or set a custom side count from 2 to 999. Type standard notation such as 3d6+2, roll with advantage using 2d20kh1, or drop the lowest with 4d6kh3. Exploding dice and success-threshold counting cover everything from indie RPGs to board-game house rules. ### Flip coins for fair, instant decisions Flip a single coin or up to 100 at once. Each flip is animated and the tool keeps a running tally of heads versus tails plus the current streak, so you can settle bets, assign turns, or run a quick A/B split without reaching for loose change. Weighted bias is available when you want an unfair coin for a game. ### Private, fast, and statistically fair Every result comes from a cryptographically secure random number generator (not JavaScript's Math.random), so the distribution is genuinely uniform and unpredictable. All rolling and flipping happens in your browser — nothing is uploaded, logged, or stored on a server — and a built-in history with a frequency histogram lets you review, copy, or export your rolls anytime. ## FAQ ### How do I roll dice online with this tool? Switch to Dice mode, choose how many dice to roll (1–12), pick a side count like d6 or d20 (or enter a custom value from 2 to 999), add a modifier if you like, then press Roll or hit the Space bar. The total and each individual die appear instantly, with a full roll history you can copy or export. ### What is dice notation and does this tool support it? Dice notation is a compact way to describe a roll: NdS+M means roll N dice with S sides each and add M. This tool parses standards like 3d6+2 (three six-sided dice plus two), 2d20kh1 (advantage — keep the highest of two d20s), and 4d6kh3 (drop the lowest). It also supports exploding dice and success thresholds. ### Can I roll with advantage or disadvantage? Yes. Use 2d20kh1 for advantage (keep the highest of two d20 rolls) or 2d20kl1 for disadvantage (keep the lowest). The tool resolves the notation for you and shows which die was kept, which is exactly what D&D and many other RPGs require. ### How many coins can I flip at once? Up to 100 coins in a single flip. The tool animates the flip and shows a live tally of heads versus tails plus the current streak, so it is perfect for quick group decisions, raffles, or probability experiments. ### Is the dice roller truly random and fair? Yes. Results come from a cryptographically secure random number generator rather than JavaScript's Math.random, giving a uniform, unpredictable distribution. No result is weighted or steered unless you deliberately turn on the optional biased-coin setting. ### Do my rolls or flips get saved or uploaded? No. All rolling, flipping, history, and stats run locally in your browser. Nothing is sent to a server, logged, or stored remotely, so your results stay completely private on your device. ### Can I use this for D&D and other tabletop games? Absolutely. Standard polyhedral dice (d4, d6, d8, d10, d12, d20, d100), advantage/disadvantage, drop-lowest rolls, exploding dice, and success counting cover the most common tabletop and role-playing systems. You can also set custom side counts for house rules. --- ToolNova — free, privacy-first browser tools. Most tools process data locally on your device. See https://www.toolnova.org/llms.txt for the full directory.