Roll 20d20
Free online 20d20 dice roller and calculator. Roll 20 d20 instantly — see results, min 20, max 400, and average 210.
Quick roll
Dice notation
kh keep highest · kl keep lowest · dl drop lowest · Space roll
Presets
Roll lines
Roll log
Your roll history appears here.
Need to roll 20d20? Dice Cove’s roller is preloaded with 20d20 so you can roll once or many times, log every result, and check the math: minimum 20, maximum 400, expected average 210.
20d20 calculator stats
- Minimum: 20
- Maximum: 400
- Average: 210
Use this page as a quick 20d20 roller and average calculator — roll as many times as you need and compare totals to the 210 expected value. For keep/drop rules and custom formulas, open the dice calculator.
How to roll 20d20
- Press Roll — notation is already set to 20d20.
- Add a modifier (for example 20d20+5) when damage or a bonus applies.
- Check the roll log to compare several 20d20 results in a row.
- Switch dice anytime via the tray or the full dice roller.
Common 20d20 uses
- Quick 20d20 damage or table rolls at the table
- Multi-attack checks or mass d20 rolls
- Compare results to the 210 average for 20d20
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- Dice calculator — averages, odds, and custom notation
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Frequently asked questions
What is the average of 20d20?
The average of 20d20 is 210. Each d20 averages 10.5, so 20 × 10.5 = 210.
What is the minimum and maximum for 20d20?
20d20 ranges from 20 (all 1s) to 400 (all 20s).
How do I roll 20d20 with a modifier?
Type 20d20+3 (or use the modifier field) to add a bonus to the total — useful for damage riders and spell attack modifiers.