Loot Drop Calculator
How many runs until you get the drop? Enter any drop rate and see exactly how many attempts you need for 50%, 90%, or 99% confidence.
About Loot Drop Calculator
You enter a drop rate — say, 2% for that rare sword — and the calculator instantly tells you how many runs it takes to have a 50%, 90%, or 99% chance of seeing it at least once. No spreadsheets, no forum posts with dodgy math. Just a number you can actually plan around.
The tool uses the standard negative binomial formula under the hood, so the results are real probability estimates rather than rough guesses. Plug in anything from a 0.1% legendary to a 25% uncommon and watch how quickly the attempt counts balloon at the 99% confidence tier. It's a good reality check before you commit forty hours to a grind.
If you build characters around those drops, One-Shot Hero pairs nicely for quick tabletop planning. This tool lives in gaming tools and works best on desktop where you can keep it open beside your game client.
How to use
This tool calculates how many attempts you need to get a rare drop in games with known drop rates. • Enter the drop rate percentage (e.g., "1" for 1% chance per attempt) • Use preset buttons for common rarity tiers: Common (50%), Uncommon (10%), Rare (5%), Epic (1%), Legendary (0.1%), or Mythic (0.01%) • Set your desired confidence level (default 90% means 90% chance you'll get the drop) • Optionally enter attempts already made to see remaining runs needed • Click Calculate to see results The calculator shows: • Main result: runs needed for your confidence level • Expected runs (mathematical average) • Median runs (50% chance) • Unlucky scenario (99% chance) • Probability table showing your chances at different attempt counts If you entered previous attempts, it shows your odds so far and whether you're getting unlucky. Each attempt is independent - previous failures don't improve future odds. Use this for farming rare items, mount drops, or any RNG-based rewards in games.
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