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Pocket Dice Roller

Pocket Dice Roller

Suggested Price $0.00

Playing a game, but don't have dice handy?

Pocket Dice Roller is an analogue, wallet-size (pocketmod) booklet that emulates d6, d10, d12, and d20 rolls.

This is not a random number generator, but an "unexpected" number generator; statistically, this does not match the randomness of an actual die roll, but it's a good replacement when you have no dice or when dice would be inconvenient.

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Reviews (1)
Discussions (3)
Customer avatar
Elliot H April 12, 2021 12:07 am UTC
I keep a Nickle in my wallet with the pocket dice roller. When I need a d20 roll, I "roll" the d10 and I flip the coin. On a heads I add 10 to the d10 result (and count the '0' as a '10'). Same principal for d12s.
Customer avatar
Elliot H November 30, 2020 6:10 pm UTC
I scaled the "letter" down to 80% before printing, and was able to get it to fit inside my wallet.
Customer avatar
Vasiliy S November 28, 2016 10:07 pm UTC
Instructions say to roll 2d10 for a d20, this is not going to give [the flat probability distribution that rolling a d20 will give][1], instead [the probability distribution will be heavily biased towards the middle numbers][2]. The same way that [rolling 2d6 results][3] in a 7 1/6th of the time and a 12 1/36th of the time.

Customer avatar
Seth K December 03, 2016 11:20 pm UTC
Yes, you're correct. Possibly a new, dedicated d20 version will be released later/soon.

There's another issue in general; there are 8 pages, so even the d6 rolls are not correctly distributed.

For this reason, I prefer to call this booklet an "unexpected number generator" rather than a "random" number generator, because it's not truly random.

Still, using this booklet for Lone Wolf and Tunnels and Trolls solo adventures has worked out well, especially since both the (pre-written) GM and the player are both biased the same way.

I'll look into publishing a d20 version soon. It'll have a free download option, as well, so if you already paid for the current version, you can just grab the d20 version for free.

Thanks for the feedback!
Customer avatar
Vasiliy S December 14, 2016 4:02 pm UTC
No problem. Thinking about this got me really into outcome probabilities of different types of dice rolls. There's [a great site for examining outcomes][1] - I was impressed that people have come up with ways to shape S curves, bathtub curves, pretty much anything.

Somebody *wink wink* could write up a primer on how to generate common curves and how to nudge them towards different shapes.

Customer avatar
Philippa H May 03, 2020 9:19 am UTC
A better way to roll 1d20 would be to roll both a d6 and a d10 - if the d6 roll comes up even, then add 10 to the d10 roll. This will give you 1-20 with an even distribution.
Customer avatar
Elliot H November 30, 2020 4:31 pm UTC
I keep a coin with my pocket dice roller. When I need a d12/d20 roll, I flip the coin and if I get heads I add 6/10 to the result.
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0.81 MB
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File Last Updated:
April 16, 2021
This title was added to our catalog on October 04, 2016.
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