Minecraft:Redstone Comparator - Revision history

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2026-07-15T11:12:18Z

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	== Usage ==		== Usage ==
	A redstone comparator can be placed on the top of any [[Minecraft:opaque]] block with a solid full-height top surface (including ~~upside~~-~~down~~ [[Minecraft:slab]]s and upside-down [[Minecraft:stairs]]). {{IN\|be}}, a comparator can also be placed on [[Minecraft:wall]]s and [[Minecraft:fence]]s. For more information about placement on transparent blocks, see [[Minecraft:Opacity/Placement]].		A redstone comparator can be placed on the top of any [[Minecraft:opaque]] block with a solid full-height top surface (including top-mode [[Minecraft:slab]]s and upside-down [[Minecraft:stairs]]). {{IN\|be}}, a comparator can also be placed on [[Minecraft:wall]]s and [[Minecraft:fence]]s. For more information about placement on transparent blocks, see [[Minecraft:Opacity/Placement]].

	The redstone comparator has a front and a back — the arrow on the top of the comparator points to the front. When placed, the comparator faces away from the player. The comparator has two miniature redstone torches at the back and one at the front. The back torches turn on when the comparator's output is greater than zero (the arrow on top also turns red). The front torch has two states that can be toggled by {{control\|using}} the comparator:		The redstone comparator has a front and a back — the arrow on the top of the comparator points to the front. When placed, the comparator faces away from the player. The comparator has two miniature redstone torches at the back and one at the front. The back torches turn on when the comparator's output is greater than zero (the arrow on top also turns red). The front torch has two states that can be toggled by {{control\|using}} the comparator:

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2026-07-12T11:19:49Z

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← Older revision		Revision as of 11:19, 12 July 2026
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	:When it is not empty, the output signal strength is calculated as follows:		:When it is not empty, the output signal strength is calculated as follows:
	{{Math\|1=signal strength = floor(1 + ((sum of all slots' fullnesses) ÷ (number of slots in container)) ÷ 14)}}		{{Math\|1=signal strength = floor(1 + ((sum of all slots' fullnesses) ÷ (number of slots in container)) × 14)}}

	{{Math\|1=fullness of a slot = (number of items in slot) ÷ (max stack size for this type of item)}}		{{Math\|1=fullness of a slot = (number of items in slot) ÷ (max stack size for this type of item)}}

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2026-06-26T11:14:57Z

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← Older revision		Revision as of 11:14, 26 June 2026
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	The formula for calculating the output signal strength is as follows:		The formula for calculating the output signal strength is as follows:

	<code>output = rear × [[Wikipedia:Iverson bracket\|[]]'''''left''''' ≤ '''''rear''''' ~~ANDROID~~</code>		<code>output = rear × [[Wikipedia:Iverson bracket\|[]]'''''left''''' ≤ '''''rear''''' AND</code><code>'''''right''''' ≤ '''''rear'''''[[Wikipedia:Iverson bracket\|<nowiki>]</nowiki>]]</code>{{-}}

	<code>'''''right''''' ≤ '''''rear'''''[[Wikipedia:Iverson bracket\|<nowiki>]</nowiki>]]</code>
	{{-}}

	=== Subtract signal strength ===		=== Subtract signal strength ===

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2026-06-22T11:11:25Z

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	The formula for calculating the output signal strength is as follows:		The formula for calculating the output signal strength is as follows:

	<code>output = rear × [[Wikipedia:Iverson bracket\|[]]'''''left''''' ≤ '''''rear''''' ~~AND~~ '''''right''''' ≤ '''''rear'''''[[Wikipedia:Iverson bracket\|<nowiki>]</nowiki>]]</code>		<code>output = rear × [[Wikipedia:Iverson bracket\|[]]'''''left''''' ≤ '''''rear''''' ANDROID</code>

			<code>'''''right''''' ≤ '''''rear'''''[[Wikipedia:Iverson bracket\|<nowiki>]</nowiki>]]</code>
	{{-}}		{{-}}

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2026-06-20T11:19:15Z

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← Older revision		Revision as of 11:19, 20 June 2026
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	{{IN\|Bedrock}} the list of comparator-conducting blocks also includes some non-conductive blocks. This may be useful in contraptions as they do not conduct redstone signals from elsewhere like a regular [[Minecraft:conductive]] block would.<ref>{{Bug\|MCPE-138549\|3=Comparators can read inventories through chains}}</ref> These blocks are: [[Category:Bedrock Edition specific information]]		{{IN\|Bedrock}} the list of comparator-conducting blocks also includes some non-conductive blocks. This may be useful in contraptions as they do not conduct redstone signals from elsewhere like a regular [[Minecraft:conductive]] block would.<ref>{{Bug\|MCPE-138549\|3=Comparators can read inventories through chains}}</ref> These blocks are: [[Category:Bedrock Edition specific information]]
	* {{BlockLink\|Chain}}
	* {{BlockLink\|Dirt Path}} and {{BlockLink\|Farmland}}		* {{BlockLink\|Dirt Path}} and {{BlockLink\|Farmland}}
			* {{BlockLink\|Iron Chain}}
	* {{BlockLink\|Piston}} and {{BlockLink\|Sticky Piston}}		* {{BlockLink\|Piston}} and {{BlockLink\|Sticky Piston}}
	* {{BlockLink\|Copper Grate}} (all variants)		* {{BlockLink\|Copper Grate}} (all variants)

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2026-06-17T11:24:27Z

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	\|2		\|2
	\|-		\|-
	\|8\|\|32\|\|1s+32\|\|2s+32\|\|4s+32\|\|13s+32\|\|27s\|\|''[[Minecraft:Music Disc stal\|stal]]''		\|8\|\|32\|\|1s+32\|\|2s+32\|\|4s+32\|\|13s+32\|\|27s\|\|''[[Minecraft:Music Disc stal\|stal]]''<br>[[Minecraft:Music Disc Bounce\|''Bounce'']]
	[[Minecraft:Music Disc Bounce\|''Bounce'']]~~{{upcoming\|Chaos Cubed}}~~
	\|8		\|8
	\|		\|

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2026-06-12T11:10:47Z

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← Older revision		Revision as of 11:10, 12 June 2026
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	:When it is not empty, the output signal strength is calculated as follows:		:When it is not empty, the output signal strength is calculated as follows:
	{{Math\|1=signal strength = floor(1 + ((sum of all slots' fullnesses)/(number of slots in container))14)}}{{Math\|1=fullness of a slot = number of items in slot/max stack size for this type of item}}		{{Math\|1=signal strength = floor(1 + ((sum of all slots' fullnesses) ÷ (number of slots in container)) ÷ 14)}}

			{{Math\|1=fullness of a slot = (number of items in slot) ÷ (max stack size for this type of item)}}
	:		:

	:''Example:'' 300 blocks in a dispenser (which has 9 slots), where each block stacks to a maximum of 64 has a 300 ''full-stack-equivalent.'' This produces an output with a signal strength of 8:		:''Example:'' 300 blocks in a dispenser (which has 9 slots), where each block stacks to a maximum of 64 has a 300 ''full-stack-equivalent.'' This produces an output with a signal strength of 8:
	<blockquote>		<blockquote>
	1 + ((300 items / 64 items per slot) / 9 slots) × 14 = 8.292, floored is 8		1 + ((300 items ÷ 64 items per slot) ÷ 9 slots) × 14 = 8.292, floored is 8
	</blockquote>		</blockquote>

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	:''Example:'' To use a furnace (which has 3 slots) to create a strength 9 signal, players need 110 items:		:''Example:'' To use a furnace (which has 3 slots) to create a strength 9 signal, players need 110 items:
	<blockquote>		<blockquote>
	max(9, (~~3×64/14~~) × (9−1)) = 109.714, rounded up is 110		max(9, (3×64÷14) × (9−1)) = 109.714, rounded up is 110
	</blockquote>		</blockquote>
	{{-}}		{{-}}

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2026-06-11T11:07:54Z

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	\| 3-1 = Powered Redstone Comparator (S)_JE6.png		\| 3-1 = Powered Redstone Comparator (S)_JE6.png
	\| 3-1caption = {{JE}}		\| 3-1caption = {{JE}}
	\| 3-2 = Powered Redstone Comparator (S)~~_JE5~~.png		\| 3-2 = Powered Redstone Comparator (S)_BE.png
	\| 3-2caption = {{BE}}		\| 3-2caption = {{BE}}
	\| 4-1 = Powered Subtracting Redstone Comparator (S)_JE7.png		\| 4-1 = Powered Subtracting Redstone Comparator (S)_JE7.png
	\| 4-1caption = {{JE}}		\| 4-1caption = {{JE}}
	\| 4-2 = Powered Subtracting Redstone Comparator (S)~~_JE6~~.png		\| 4-2 = Powered Subtracting Redstone Comparator (S)_BE.png
	\| 4-2caption = {{BE}}		\| 4-2caption = {{BE}}
	\| 1-2 = Redstone Comparator (S)_BE.png		\| 1-2 = Redstone Comparator (S)_BE.png
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	\|{{HistoryLine\|\|1.2.0\|dev=beta 1.2.0.2\|Redstone comparators now measure [[Minecraft:jukebox]]es.		\|{{HistoryLine\|\|1.2.0\|dev=beta 1.2.0.2\|Redstone comparators now measure [[Minecraft:jukebox]]es.
	\|Redstone comparators now render their underside, which has changed their undersides from [[File:Redstone Comparator UNKVER1 (facing NWU).png\|32px]] to [[File:Redstone Comparator UNKVER3 (facing NWU).png\|32px]]}}		\|Redstone comparators now render their underside, which has changed their undersides from [[File:Redstone Comparator UNKVER1 (facing NWU).png\|32px]] to [[File:Redstone Comparator UNKVER3 (facing NWU).png\|32px]]}}
	\|{{HistoryLine\|\|1.10.0\|dev=beta 1.10.0.3\|[[File:Redstone Comparator (S) BE.png\|32px]] [[File:Powered Redstone Comparator (S) BE.png\|32px]] [[File:Subtracting Redstone Comparator (S) BE.png\|32px]] [[File:Powered Subtracting Redstone Comparator (S) BE.png\|32px]] [[File:Redstone Comparator (item) JE2 BE2.png\|32px]] The textures of redstone comparators have now been changed.}}		\|{{HistoryLine\|\|1.10.0\|dev=beta 1.10.0.3\|[[File:Redstone Comparator (S) BE2.png\|32px]] [[File:Powered Redstone Comparator (S) BE2.png\|32px]] [[File:Subtracting Redstone Comparator (S) BE2.png\|32px]] [[File:Powered Subtracting Redstone Comparator (S) BE2.png\|32px]] [[File:Redstone Comparator (item) JE2 BE2.png\|32px]] The textures of redstone comparators have now been changed.}}
	\|{{HistoryLine\|\|1.11.0\|dev=beta 1.11.0.1\|Redstone comparators now measure [[Minecraft:smoker]]s, [[Minecraft:blast furnace]]s, [[Minecraft:lectern]]s and [[Minecraft:composter]]s.}}		\|{{HistoryLine\|\|1.11.0\|dev=beta 1.11.0.1\|Redstone comparators now measure [[Minecraft:smoker]]s, [[Minecraft:blast furnace]]s, [[Minecraft:lectern]]s and [[Minecraft:composter]]s.}}
	\|{{HistoryLine\|\|1.18.10\|dev=beta 1.18.10.20\|[[File:Powered Redstone Comparator (S) ~~JE5~~.png\|32px]] [[File:Powered Subtracting Redstone Comparator (S) ~~JE6~~.png\|32px]] The texture of powered redstone comparator have now been changed.}}		\|{{HistoryLine\|\|1.18.10\|dev=beta 1.18.10.20\|[[File:Powered Redstone Comparator (S) BE3.png\|32px]] [[File:Powered Subtracting Redstone Comparator (S) BE3.png\|32px]] The texture of powered redstone comparator have now been changed.}}
	\|{{HistoryLine\|\|1.20.50\|dev=Preview 1.20.50.20\|Redstone comparators now measure [[Minecraft:decorated pot]]s.}}		\|{{HistoryLine\|\|1.20.50\|dev=Preview 1.20.50.20\|Redstone comparators now measure [[Minecraft:decorated pot]]s.}}
	\|{{HistoryLine\|\|1.20.50\|exp=Update 1.21\|dev=Preview 1.20.50.21\|Redstone comparators now measure [[Minecraft:crafter]]s.}}		\|{{HistoryLine\|\|1.20.50\|exp=Update 1.21\|dev=Preview 1.20.50.21\|Redstone comparators now measure [[Minecraft:crafter]]s.}}

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2026-06-03T11:11:56Z

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	;{{BlockLink\|Beehive}} and {{BlockLink\|bee nest}}		;{{BlockLink\|Beehive}} and {{BlockLink\|bee nest}}
	: A hive or nest outputs a signal strength equal to the amount of honey in the hive/nest.		: A hive or nest outputs a signal strength equal to the amount of honey in the hive/nest up to a maximum of 5.

	;{{BlockLink\|Cake}}		;{{BlockLink\|Cake}}

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2026-05-31T11:14:58Z

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	\|-		\|-
	\|8\|\|32\|\|1s+32\|\|2s+32\|\|4s+32\|\|13s+32\|\|27s\|\|''[[Minecraft:Music Disc stal\|stal]]''		\|8\|\|32\|\|1s+32\|\|2s+32\|\|4s+32\|\|13s+32\|\|27s\|\|''[[Minecraft:Music Disc stal\|stal]]''
	[[Minecraft:Music Disc Bounce\|''Bounce'']]~~<ref>Upcoming 26.2</ref>~~		[[Minecraft:Music Disc Bounce\|''Bounce'']]{{upcoming\|Chaos Cubed}}
	\|8		\|8
	\|		\|
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	</blockquote>		</blockquote>
	{{-}}		{{-}}


	==== Miscellaneous ====		==== Miscellaneous ====

← Older revision		Revision as of 11:19, 20 June 2026
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	{{IN\|Bedrock}} the list of comparator-conducting blocks also includes some non-conductive blocks. This may be useful in contraptions as they do not conduct redstone signals from elsewhere like a regular [[Minecraft:conductive]] block would.<ref>{{Bug\|MCPE-138549\|3=Comparators can read inventories through chains}}</ref> These blocks are: [[Category:Bedrock Edition specific information]]		{{IN\|Bedrock}} the list of comparator-conducting blocks also includes some non-conductive blocks. This may be useful in contraptions as they do not conduct redstone signals from elsewhere like a regular [[Minecraft:conductive]] block would.<ref>{{Bug\|MCPE-138549\|3=Comparators can read inventories through chains}}</ref> These blocks are: [[Category:Bedrock Edition specific information]]
	* {{BlockLink\|Chain}}
	* {{BlockLink\|Dirt Path}} and {{BlockLink\|Farmland}}		* {{BlockLink\|Dirt Path}} and {{BlockLink\|Farmland}}
			* {{BlockLink\|Iron Chain}}
	* {{BlockLink\|Piston}} and {{BlockLink\|Sticky Piston}}		* {{BlockLink\|Piston}} and {{BlockLink\|Sticky Piston}}
	* {{BlockLink\|Copper Grate}} (all variants)		* {{BlockLink\|Copper Grate}} (all variants)