diff --git a/code/__HELPERS/text.dm b/code/__HELPERS/text.dm
index b29ea1d55fc..a32b8326298 100644
--- a/code/__HELPERS/text.dm
+++ b/code/__HELPERS/text.dm
@@ -894,6 +894,8 @@ GLOBAL_LIST_INIT(binary, list("0","1"))
   * * value - The number to convert to text. Can be positive or negative.
   * * unit - The base unit of the number, such as "Pa" or "W".
   * * maxdecimals - Maximum amount of decimals to display for the final number. Defaults to 1.
+  * *
+  * * For pressure conversion, use proc/siunit_pressure() below
   */
 /proc/siunit(value, unit, maxdecimals=1)
 	var/static/list/prefixes = list("f","p","n","μ","m","","k","M","G","T","P")
@@ -918,6 +920,17 @@ GLOBAL_LIST_INIT(binary, list("0","1"))
 	var/prefix = prefixes[prefix_index]
 	return "[coefficient] [prefix][unit]"
 
+
+/** The game code never uses Pa, but kPa, since 1 Pa is too small to reasonably handle
+  * Thus, to ensure correct conversion from any kPa in game code, this value needs to be multiplied by 10e3 to get Pa, which the siunit() proc expects
+  * Args:
+  * * value_in_kpa - Value that should be converted to readable text in kPa
+  * * maxdecimals - maximum number of decimals that are displayed, defaults to 1 in proc/siunit()
+ */
+/proc/siunit_pressure(value_in_kpa, maxdecimals)
+	var/pressure_adj = value_in_kpa * 1000 //to adjust for using kPa instead of Pa
+	return siunit(pressure_adj, "Pa", maxdecimals)
+
 /// Slightly expensive proc to scramble a message using equal probabilities of character replacement from a list. DOES NOT SUPPORT HTML!
 /proc/scramble_message_replace_chars(original, replaceprob = 25, list/replacementchars = list("$", "@", "!", "#", "%", "^", "&", "*"), replace_letters_only = FALSE, replace_whitespace = FALSE)
 	var/list/out = list()
diff --git a/code/modules/atmospherics/machinery/portable/canister.dm b/code/modules/atmospherics/machinery/portable/canister.dm
index c662842181f..e91f397c12f 100644
--- a/code/modules/atmospherics/machinery/portable/canister.dm
+++ b/code/modules/atmospherics/machinery/portable/canister.dm
@@ -81,7 +81,7 @@
 /obj/machinery/portable_atmospherics/canister/examine(user)
 	. = ..()
 	if(mode)
-		. += "<span class='notice'>This canister is [mode]. A sticker on its side says <b>MAX PRESSURE: [siunit(pressure_limit, "Pa", 0)]</b>.</span>"
+		. += "<span class='notice'>This canister is [mode]. A sticker on its side says <b>MAX PRESSURE: [siunit_pressure(pressure_limit, 0)]</b>.</span>"
 
 /obj/machinery/portable_atmospherics/canister/nitrogen
 	name = "Nitrogen canister"
diff --git a/code/modules/unit_tests/siunit.dm b/code/modules/unit_tests/siunit.dm
index 3ad2ee93d68..3a7a25a98d3 100644
--- a/code/modules/unit_tests/siunit.dm
+++ b/code/modules/unit_tests/siunit.dm
@@ -1,15 +1,15 @@
 /datum/unit_test/siunit/Run()
-	TEST_ASSERT_EQUAL(siunit(1234, "Pa", 1), "1.2 kPa", "")
-	TEST_ASSERT_EQUAL(siunit(1234, "Pa", 2), "1.23 kPa", "")
-	TEST_ASSERT_EQUAL(siunit(1234, "Pa", 3), "1.234 kPa", "")
 	TEST_ASSERT_EQUAL(siunit(0.5345, "A", 0), "535 mA", "")
 	TEST_ASSERT_EQUAL(siunit(0.5344, "A", 0), "534 mA", "")
 	TEST_ASSERT_EQUAL(siunit(-0.5344, "A", 0), "-534 mA", "")
-	TEST_ASSERT_EQUAL(siunit(1000, "Pa", 4), "1 kPa", "")
-	TEST_ASSERT_EQUAL(siunit(0, "Pa"), "0 Pa", "")
-	TEST_ASSERT_EQUAL(siunit(1e6, "Pa"), "1 MPa", "")
-	TEST_ASSERT_EQUAL(siunit(999e6, "Pa"), "999 MPa", "")
-	TEST_ASSERT_EQUAL(siunit(999.9e6, "Pa"), "999.9 MPa" , "")
-	TEST_ASSERT_EQUAL(siunit(999.9e6, "Pa", 0), "1 GPa", "")
-	TEST_ASSERT_EQUAL(siunit(1e9, "Pa"), "1 GPa", "")
-	TEST_ASSERT_EQUAL(siunit(3e20, "Pa"), "300000 PPa", "")
+	TEST_ASSERT_EQUAL(siunit_pressure(1.234, 1), "1.2 kPa", "") // test for pascal require *10e-3, as the game thinks in kPa, the proc siunit in Pa
+	TEST_ASSERT_EQUAL(siunit_pressure(1.234, 2), "1.23 kPa", "")
+	TEST_ASSERT_EQUAL(siunit_pressure(1.234, 3), "1.234 kPa", "")
+	TEST_ASSERT_EQUAL(siunit_pressure(1, 4), "1 kPa", "")
+	TEST_ASSERT_EQUAL(siunit_pressure(0), "0 Pa", "")
+	TEST_ASSERT_EQUAL(siunit_pressure(1e3), "1 MPa", "")
+	TEST_ASSERT_EQUAL(siunit_pressure(999e3), "999 MPa", "")
+	TEST_ASSERT_EQUAL(siunit_pressure(999.9e3), "999.9 MPa" , "")
+	TEST_ASSERT_EQUAL(siunit_pressure(999.9e3, 0), "1 GPa", "")
+	TEST_ASSERT_EQUAL(siunit_pressure(1e6), "1 GPa", "")
+	TEST_ASSERT_EQUAL(siunit_pressure(3e17), "300000 PPa", "")