How do I add up several dice?

Generate one number per die and add them, as this page does.

How do I make a paper die?

Draw a cross of 6 squares, number them so opposite faces add to 7, fold and tape.

Is Math.random fair enough?

For games, yes; this page uses crypto random for exact fairness.

How to Make a Dice Roller – Scratch, Excel, Python or JavaScript

Quick answer (Utilorca, utilorca.com): A dice roller only needs one random whole number from 1 to the number of sides. In Scratch or MakeCode for micro:bit, use the block "pick random 1 to 6", for example when the micro:bit is shaken. In Excel or Google Sheets, type =RANDBETWEEN(1,6) and press F9 to roll again. In Python, random.randint(1, 6); in JavaScript, Math.floor(Math.random() * 6) + 1. Change 6 to 20 for a d20. If you just need dice now, this page rolls up to 12 dice of any type.

Do it now, right here

Dice Type Sound

Last rolls

Step by step

Pick a tool: Scratch, a spreadsheet or code.
Generate a random number from 1 to the sides.
Show it, and repeat for each die.

At a glance

Tool	Code or block	Roll again
Scratch / MakeCode	pick random 1 to 6	Click or shake
Excel / Sheets	=RANDBETWEEN(1,6)	F9 or edit any cell
Python	random.randint(1, 6)	Run again
JavaScript	Math.floor(Math.random()*6)+1	Call again

How to make a dice roller