I saw a rumor online a long time ago that stated by microwaving a die on a specific face it would be more likely to land on said face and have been looking for science by which to either prove or disprove this method for creating a set of loaded dice for use in a d20 campaign.

I'm looking for answers with at least some form of testing involved utilizing a microwave to significantly alter a die's balance. Answers with an accompanying chi-squared test or a Saltwater float test to determine balance after the experimentation has been done would be preferred.

Testing with multiple types of dice would also be appreciated. (to make fudge damage dice)

Note: Microwaving dice will likely destroy them and should only be attempted by people who have many spare dice. Microwaving of plastics in the microwave also carries the risk of melting said dice if the time spent in the microwave exceeds a certain time, so for your own safety please don't touch dice with your bare hands without some form of safety precautions.


3 Answers 3


It doesn't do anything.

As a chemist, I had to give this a try.

First, I started with a die that had a clear bias toward ~18, according to the saltwater test. The first picture is the initial drop into the water, and the second is after poking the die.

enter image description here

I put the die on a paper plate, and microwaved it for 4 minutes. I made sure to put it on its "side," so that if there was some kind of difference on the top and bottom, it would affect the balance.

enter image description here

After microwaving, I put it back into the salt water, to see that there is still a rough bias toward 18. As before, the left is pre-poke, and the right is post-poke.

enter image description here

This is not surprising.

I could have microwaved it even more, but I don't think that it's necessary: while the paper plate got hot, the die hardly warmed up at all.

This is because microwaves work through dielectric heating, which requires the molecules to have a dipole moment. Dice are made of polymers, and while I don't know exactly which polymer my die is made of, many polymers don't have a permanent dipole moment and thus wouldn't warm up significantly in the microwave. I suppose you could microwave for a really long time, or submerge it in something that does heat up, but that's an awful lot of effort for a single loaded die.

If you want to melt your dice, you're better off putting them in the oven. If you want loaded dice, you should just buy one.

I don't even think that melting your dice would affect their balance anyway. Most things, including microwaves, heat from the outside in. In the case of, say, a hot pocket, the interior heats up a lot faster because it has a lot more water to get heated, compared to the relatively dry pastry outside. However, gaming dice are pretty much uniform throughout, and so any melting that could plausibly affect the internal balance would mean that the outside would be obviously melted.

What if we put it in something that does heat up?

In true Mythbusters fashion (and because this answer is getting a lot of attention), I wanted to see if there was a way to get the microwave to affect the die. We know that water heats up a lot in the microwave, so what if we put the die partially in a layer of water, so that one side of it get heated and the other doesn't?

I put the same die back in the paper plate, and added a layer of water to submerge half of the die. I then put it back in the microwave for 4 minutes, and measure the temperature of the water. As you can see, the water definitely heats up (it was actually at boiling when I first measured it, and cooled slightly before I took the picture):

enter image description here

212 F is the hottest that liquid water can get. Any extra energy that goes into non-superheated water at 212F will go toward evaporating the water, not increasing its temperature. Therefore, 212F is the maximum temperature we can apply to the die with this setup.

After the die was partially boiled, I noticed that the surface that was under the water had a slightly chalkier texture. Is this heat enough to affect the balance of the die?

enter image description here

Unfortunately, no--the die still shows a bias toward 18.

What about the oven?

This is a bit outside the scope of the question, but I was curious to see if the higher temperature of the oven would be able to change the balance of the die without obviously changing its appearance. I preheated the oven to 300F, and put the poor d20 inside for 20 minutes:

enter image description here

This melted the bottom of the die:

enter image description here

Which was enough to significantly change the balance in the saltwater test:

enter image description here

So yes, the basic principle of melting your die to change its balance works. However, you need to melt the die in the higher heat of the oven, and not the microwave. It also obviously changes the appearance of the die, so you're not going to make any secretly loaded dice this way.

Just buy a loaded d20.

  • \$\begingroup\$ Comments are not for extended discussion; this conversation has been moved to chat. \$\endgroup\$
    – mxyzplk
    Dec 22, 2017 at 5:20
  • \$\begingroup\$ A common sort of variable load loaded die has a construction format that would almost make this work. I keep coming back to this question and almost posting an answer, but it doesn't actually work so I think it works better as a comment. Many variable load dice work by having a solid ball-bearing-like heavy core suspended in a light weight, easily melted substance that's solid at room temperature. The whole filling is encased in a typical polymer die shell (with a pip drilled out and resealed, usually). \$\endgroup\$ Jan 23, 2018 at 23:50
  • \$\begingroup\$ You heat the material by clenching your hand and your body heat is enough to just melt the filling and allow the ball bearing to shift. Unfortunately, the filling involved is usually (as in, always as far as I'm aware) parrafin. Parrafin has, like, no water in it at all and does not heat well in a microwave. Instead of melting, it will catch fire if you heat it long enough, and the inside will still be solid. idk what happens if the die casing air-seals it, though. \$\endgroup\$ Jan 23, 2018 at 23:54
  • \$\begingroup\$ What would happen if you were to use a metal die? I believe I heard somewhere that metal reacts more microwaves. \$\endgroup\$ Aug 8, 2019 at 0:13
  • \$\begingroup\$ 10/10 effort, you really went all out on this myth \$\endgroup\$
    – Hobbamok
    Jan 11, 2021 at 13:21

What you have there is an urban legend. Since domestic microwaves are designed to heat food as evenly as possible, and the microwaves will penetrate plastics as readily as food, microwaving just one face of a die is impractical.

Heating the whole die so that it slumps a bit and enlarges its bottom face may make it more likely to finish a roll with that face downwards, but that's unlikely to have a significant effect without the die being obviously misshapen.

I suspect the post you saw was written by a prankster who liked the idea of:

  • People damaging their dice by melting them.
  • People contaminating their microwave ovens with the smell of burnt plastic, making food heated in them unpalatable.
  • People damaging their microwave ovens by running them without sufficient microwave-absorbing material in them.

As detailed in the other answers, microwaving does not work.

Baking does, with most kinds of die, as they actually heat the die, melting and rearranging the inside to be heavier on the side it is sitting on while baked, thus increasing the likelihood of rolling this-side-down.

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    \$\begingroup\$ Welcome to rpg.se. Would you like to provide some sources, links or other material to support your argument? \$\endgroup\$
    – ZwiQ
    Dec 21, 2017 at 14:38
  • 1
    \$\begingroup\$ As my experiment shows, the side that it's baked on actually becomes the side that's most likely to be on top. \$\endgroup\$
    – Icyfire
    Dec 22, 2017 at 0:53
  • \$\begingroup\$ @Icyfire I think his wording is miss leading, he was trying to say the side it is sitting on when baked is the side that will get heavier and land face down. \$\endgroup\$ Dec 22, 2017 at 2:05
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    \$\begingroup\$ @NotACheater I also find your evaluation (presumably based on experience) humorous given your account name. \$\endgroup\$ Dec 22, 2017 at 2:06
  • \$\begingroup\$ @MichaelGorman, Ah, that makes a lot more sense. \$\endgroup\$
    – Icyfire
    Dec 22, 2017 at 2:24

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