diff --git a/VCECore/hevc_level.cpp b/VCECore/hevc_level.cpp
index 80117a01..eaea15b6 100644
--- a/VCECore/hevc_level.cpp
+++ b/VCECore/hevc_level.cpp
@@ -76,10 +76,20 @@ static const uint32_t HEVC_LEVEL_LIMITS[_countof(HEVC_LEVEL_INDEX)+1][LEVEL_COLU
 };
 
 //必要なLevelを計算する, 適合するLevelがなければ 0 を返す
-int calc_hevc_auto_level(int width, int height, int fps_num, int fps_den, bool high_tier, int max_bitrate) {
+int calc_hevc_auto_level(int width, int height, int ref, int fps_num, int fps_den, bool high_tier, int max_bitrate) {
+    int ref_mul_x3 = 3; //refのためにsample数にかけたい数を3倍したもの(あとで3で割る)
+    if (ref > 12) {
+        ref_mul_x3 = 4*3;
+    } else if (ref > 8) {
+        ref_mul_x3 = 2*3;
+    } else if (ref > 6) {
+        ref_mul_x3 = 4;
+    } else {
+        ref_mul_x3 = 3;
+    }
     uint32_t data[LEVEL_COLUMNS] = {
         (uint32_t)std::min((uint64_t)(width * height) * fps_num / fps_den, (uint64_t)UINT32_MAX),
-        (uint32_t)width * height,
+        (uint32_t)width * height * ref_mul_x3 / 3,
         (high_tier) ? 0 : (uint32_t)max_bitrate,
         (high_tier) ? (uint32_t)max_bitrate : 0,
         NULL
diff --git a/VCECore/hevc_level.h b/VCECore/hevc_level.h
index dfd0b73d..a0deb8cc 100644
--- a/VCECore/hevc_level.h
+++ b/VCECore/hevc_level.h
@@ -28,7 +28,7 @@
 #ifndef __HEVC_LEVEL_H__
 #define __HEVC_LEVEL_H__
 
-int calc_hevc_auto_level(int width, int height, int fps_num, int fps_den, bool high_tier, int max_bitrate);
+int calc_hevc_auto_level(int width, int height, int ref, int fps_num, int fps_den, bool high_tier, int max_bitrate);
 int get_hevc_max_bitrate(int level, bool high_tier);
 bool is_avail_hevc_high_tier(int level);
 
diff --git a/VCECore/vce_core.cpp b/VCECore/vce_core.cpp
index 03a12864..8aa60772 100644
--- a/VCECore/vce_core.cpp
+++ b/VCECore/vce_core.cpp
@@ -1358,7 +1358,7 @@ RGY_ERR VCECore::initEncoder(VCEParam *prm) {
         } else if (prm->codec == RGY_CODEC_HEVC) {
             const bool high_tier = prm->codecParam[prm->codec].nTier == AMF_VIDEO_ENCODER_HEVC_TIER_HIGH;
             if (level == 0) {
-                level = calc_hevc_auto_level(m_encWidth, m_encHeight, //m_stEncConfig.encodeCodecConfig.hevcConfig.maxNumRefFramesInDPB,
+                level = calc_hevc_auto_level(m_encWidth, m_encHeight, prm->nRefFrames,
                     m_encFps.n(), m_encFps.d(), high_tier, max_bitrate_kbps);
             }
             max_bitrate_kbps = get_hevc_max_bitrate(level, high_tier);