Ultra compact full adder, 2 blocks deep, using only redstone torches and dust. 6x8x2
| Category | Redstone |
| Theme | Other |
| Size | Small |
| File Format | .litematic |
| Submitted by | RubenHillier |
| Posted on | July 31st, 2026 05:53 AM EST |
| Download(s) | Has been downloaded 2 times |
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Dimensions
Length 2 Width 6 Height 8 68 blocks Relative height to paste: 8 blocksDescription
I have built a compact 1-bit ripple full adder; the dimensions are 6 wide by 8 tall with a depth of 2. I was able to make this very small thanks to my XOR gate, which is 4x2x4 (I will post it soon; it's also on my Reddit, u/Aggravating_Quiet_85). This full adder is a refined version of the one I have already posted on my Reddit.
I stacked two of my XOR gates on top of each other, and for the carry-out, I used the fact that both XOR gates already have a torch that works when both inputs are on; I simply ORed these signals together.
I have managed to place all the inputs on the base and the carry-out on the side; to put them in a linked row, the mirrored form is needed every other time. This allows the carry-in and carry-out to be on the same side.
I have updated this design (V1.1) and have now posted V1.2; the new version is 5 wide, a reduction of 1 block width. I have also reduced the tick delay in the carry circuit by one redstone tick to 4 ticks.
This is done in Java Edition.
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