diff --git a/internal/api/handlers_user.go b/internal/api/handlers_user.go
index 4295f47..ff34171 100644
--- a/internal/api/handlers_user.go
+++ b/internal/api/handlers_user.go
@@ -1145,15 +1145,10 @@ func quantityToMilli(q resource.Quantity) int {
 	return int(q.MilliValue())
 }
 
-// quantityToMB converts a K8s resource.Quantity to whole megabytes, rounding up
-// (e.g. "4Gi"→4096, "1G"→1000). A zero/unset quantity returns 0.
+// quantityToMB converts a K8s resource.Quantity to whole MiB, the MB of the quota
+// columns, rounding up so a size between two counts as the larger: "4Gi"→4096,
+// "1G"→954. A zero/unset quantity returns 0.
 func quantityToMB(q resource.Quantity) int {
-	if q.IsZero() {
-		return 0
-	}
-	mb := q.Value() / (1024 * 1024)
-	if mb < 1 {
-		return 1
-	}
-	return int(mb)
+	const mib = 1 << 20
+	return int((q.Value() + mib - 1) / mib)
 }
diff --git a/internal/api/quantity_test.go b/internal/api/quantity_test.go
new file mode 100644
index 0000000..98d64a5
--- /dev/null
+++ b/internal/api/quantity_test.go
@@ -0,0 +1,31 @@
+package api
+
+import (
+	"testing"
+
+	"k8s.io/apimachinery/pkg/api/resource"
+)
+
+// Sizes reach the quota sums in whole MiB, rounded up: a part-MiB used to be
+// dropped, so a server sized in decimal units counted for less than it holds.
+func TestQuantityToMB(t *testing.T) {
+	for _, c := range []struct {
+		in   string
+		want int
+	}{
+		{"4Gi", 4096},
+		{"1Mi", 1},
+		{"1G", 954},     // 953.67 MiB
+		{"1500M", 1431}, // 1430.51 MiB
+		{"1048577", 2},  // one byte past 1 MiB
+		{"1", 1},
+		{"0", 0},
+	} {
+		if got := quantityToMB(resource.MustParse(c.in)); got != c.want {
+			t.Errorf("quantityToMB(%s) = %d, want %d", c.in, got, c.want)
+		}
+	}
+	if got := quantityToMB(resource.Quantity{}); got != 0 {
+		t.Errorf("quantityToMB(unset) = %d, want 0", got)
+	}
+}