diff --git a/src/features/dsp408/components/DelaySection/DelaySection.tsx b/src/features/dsp408/components/DelaySection/DelaySection.tsx
index 7a60282..6611c79 100644
--- a/src/features/dsp408/components/DelaySection/DelaySection.tsx
+++ b/src/features/dsp408/components/DelaySection/DelaySection.tsx
@@ -79,6 +79,7 @@ function DelayGraph({
   unit: DelayUnit;
 }) {
   const [min, max] = DELAY_RANGES[unit];
+  const roundedMax = (Math.floor(max / 100) + 1) * 100;
   const labelByX = useMemo(() => {
     const map = new Map<number, string>();
     rows.forEach((row, i) => map.set(i + 1, row.label));
@@ -93,7 +94,7 @@ function DelayGraph({
         xMax={rows.length + 0.5}
         xStep={1}
         yMin={min}
-        yMax={max}
+        yMax={roundedMax}
         xLabel="Channel"
         yLabel={UNIT_LABEL[unit]}
         showGrid={true}