Roll a D120 die and a D120 die

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D120 + D120 Dice Roller

  • Rolls a D120 die and a D120 die.
  • Lets you roll multiple dice like 2 D120s, or 3 D120s. Add, remove or set numbers of dice to roll.
  • Combine with other types of dice (like D118 and D122) to throw and make a custom dice roll.

Statistics of this Dice Roller

  • Total Kinds of Dice1
  • Total Dice2
  • Minimum Sum2
  • Maximum Sum240
  • Lowest Dice Face1
  • Highest Dice Face120
  • Highest Dice Face of the Smallest Die120
  • Total Possible Combinations 7,260

    Number of combinations are calculated using the formula [ (120+2-1) choose (2) ]

    You can try generating all the combinations using the following combination generator
    All possible combinations of 2D120
  • Total Possible Permutations 14,400

    Number of permutations are calculated using the formula [ 120^2 ]

    You can try generating all the permutations using the following permutations generator
    All possible permutations of 2D120

Probabilities of this Dice Roller

Probability of getting atleast one 1 is close to 0.017, about 1.66% percent.

This is calculated by multiplying all the probabilities of not getting a 1 for each dice and then subtracting the answer from 1.

1 - (119/120 x 119/120)

Probability of not getting any 1 is close to 0.98, about 98.34% percent.

This is calculated by multiplying all the probabilities of not getting a 1 for each dice.

119/120 x 119/120

Probability of getting all 1's is close to 0.000069, about 0.0069% percent.

This is calculated by multiplying together all the probabilities of getting a 1 for each dice.

1/120 x 1/120

Probability of getting 2 1's is close to 0.000069, about 0.0069% percent.

This is calculated by multiplying together all the probabilities of getting a 1 for each dice that has a 1.

1/120 x 1/120

Probability of getting atleast one 120 is close to 0.017, about 1.66% percent.

This is calculated by multiplying all the probabilities of not getting a 120 for each dice and then subtracting the answer from 1.

1 - (119/120 x 119/120)

Probability of not getting any 120 is close to 0.98, about 98.34% percent.

This is calculated by multiplying all the probabilities of not getting a 120 for each dice.

119/120 x 119/120

Probability of getting all 120's is close to 0.000069, about 0.0069% percent.

This is calculated by multiplying together all the probabilities of getting a 120 for each dice.

1/120 x 1/120

Probability of getting 2 120's is close to 0.000069, about 0.0069% percent.

This is calculated by multiplying together all the probabilities of getting a 120 for each dice that has a 120.

1/120 x 1/120

Probability of getting all the maximum faces (2 120's) is close to 0.000069, about 0.0069% percent.

This is calculated by multiplying together all the probabilities of getting the maximum face for each dice.

1/120 x 1/120

Probability of getting one of a kind is close to 0.0083, about 0.83% percent.

There are 120 ways to get one of a kind (all 1's, all 2's, all 3's, all 4's, all 5's, all 6's, all 7's, all 8's, all 9's, all 10's, all 11's, all 12's, all 13's, all 14's, all 15's, all 16's, all 17's, all 18's, all 19's or all 20's and so on). The probability of getting all of any kind is then caclulated by adding the probability of getting all 1's, all 2's, all 3's, all 4's, all 5's, all 6's, all 7's, all 8's, all 9's, all 10's, all 11's, all 12's, all 13's, all 14's, all 15's, all 16's, all 17's, all 18's, all 19's or all 20's and so on. Since, probabilities of getting all 1's through all 120's are the same, we can multiply them all together. So, multiplying the probability of getting all 1's by 120 will give us the probability of getting all of any kind.

    
    120 x (1/120 x 1/120)    
    

Javascript code to create this dice roller


    
    // define the sets of dice to use
    // 1 set for each kind of dice
    var dice_sets = [
                [1, 120], // 1d120        
                [1, 120], // 1d120        
            ];

    var this_roll = []; // array to store the results of this roll

    for (var ds = 0; ds < dice_sets.length; ds++) {

        //loop through each dice set

        // for each dice set, determine the numbers of dice, lowest and highest side of the dice

        var numbers_of_dice = dice_sets[ds][0];     // how many dice to roll 
        var lowest = 1;                             // lowest possible side of the dice
        var highest = dice_sets[ds][1];             // highest possible side of the dice          

        for (var j = 1; j <= numbers_of_dice; j++) {

            // loop for the number of dice

            // for each dice, generate a number between lowest and highest
            var dice_face = Math.floor(Math.random() * (highest-lowest+1) + lowest);
            this_roll.push(dice_face); //store this in the array
        }


    }            
        
    // print all the generated rolls
        
    for (j = 0; j < this_roll.length; j++) {

        // loop through the inner dice array 

        //print each dice roll value followed by a space
        document.write(this_roll[j]);
        document.write(" ");

    }

    
    

    /* 

    Sample output 

    

    */
    


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