diff --git a/client/src/lib/games/bms-pms.tsx b/client/src/lib/games/bms-pms.tsx
index 1a7698569..f5699312b 100644
--- a/client/src/lib/games/bms-pms.tsx
+++ b/client/src/lib/games/bms-pms.tsx
@@ -82,7 +82,7 @@ const BASE_IMPL: GPTClientImplementation<GPTStrings["bms" | "pms"]> = {
 
 					// i don't know if this is correct
 					// it's just really hard to work out.
-					return Math.floor(v).toFixed(0);
+					return Math.round(v).toFixed(0);
 				}}
 			/>
 			<BMSOrPMSLampCell score={sc} />
diff --git a/client/src/lib/games/iidx.tsx b/client/src/lib/games/iidx.tsx
index d15f1a387..dab3ea3ee 100644
--- a/client/src/lib/games/iidx.tsx
+++ b/client/src/lib/games/iidx.tsx
@@ -106,7 +106,7 @@ const IIDXCoreCells: GPTClientImplementation<GPTStrings["iidx"]>["scoreCoreCells
 
 				// i don't know if this is correct
 				// it's just really hard to work out.
-				return Math.floor(v).toFixed(0);
+				return Math.round(v).toFixed(0);
 			}}
 		/>
 		<IIDXLampCell sc={sc} chart={chart} />
diff --git a/server/src/game-implementations/games/iidx.test.ts b/server/src/game-implementations/games/iidx.test.ts
index d9d5ca80d..b4cf3a2f8 100644
--- a/server/src/game-implementations/games/iidx.test.ts
+++ b/server/src/game-implementations/games/iidx.test.ts
@@ -2,7 +2,7 @@ import { IIDX_DP_IMPL, IIDX_SP_IMPL } from "./iidx";
 import db from "external/mongo/db";
 import CreateLogCtx from "lib/logger/logger";
 import { CreatePBDoc } from "lib/score-import/framework/pb/create-pb-doc";
-import { IIDX_GRADES, IIDX_LAMPS } from "tachi-common";
+import { GetGrade, IIDXLIKE_GBOUNDARIES, IIDX_GRADES, IIDX_LAMPS } from "tachi-common";
 import t from "tap";
 import { dmf, mkFakePBIIDXSP, mkFakeScoreIIDXSP } from "test-utils/misc";
 import ResetDBState from "test-utils/resets";
@@ -360,6 +360,19 @@ t.test("IIDX Implementation", (t) => {
 					IIDX_LAMPS.HARD_CLEAR,
 					"HARD CLEAR"
 				);
+				f(
+					"grade",
+					{ score: 1899, percent: (100 * 1899) / 1918, grade: "MAX-" },
+					IIDX_GRADES.MAX,
+					"MAX-19"
+				);
+
+				f(
+					"grade",
+					{ score: 2831, percent: (100 * 2831) / 3546, grade: "AA" },
+					IIDX_GRADES.AA,
+					"AA+73"
+				);
 
 				t.end();
 			});