diff --git a/src/layout/horizontal.h b/src/layout/horizontal.h
index 3ded199..c036cfb 100644
--- a/src/layout/horizontal.h
+++ b/src/layout/horizontal.h
@@ -413,6 +413,21 @@ void center_tile(Monitor *m) {
 	// 判断是否需要主区域铺满
 	int should_overspread = center_master_overspread && (n <= nmasters);
 
+	uint32_t master_surplus_height =
+		(m->w.height - 2 * cur_gappov -
+					 cur_gappiv * ie * (master_num - 1));
+	float master_surplus_ratio = 1.0;
+
+	uint32_t slave_left_surplus_height =
+		(m->w.height - 2 * cur_gappov -
+							 cur_gappiv * ie * (stack_num / 2 - 1));
+	float slave_left_surplus_ratio = 1.0;
+
+	uint32_t slave_right_surplus_height =
+		 (m->w.height - 2 * cur_gappov -
+							 cur_gappiv * ie * ((stack_num + 1) / 2 - 1));
+	float slave_right_surplus_ratio = 1.0;
+
 	if (n > nmasters || !should_overspread) {
 		// 计算主区域宽度（居中模式）
 		mw = nmasters ? (m->w.width - 2 * cur_gappoh - cur_gappih * ie) * mfact
@@ -457,9 +472,9 @@ void center_tile(Monitor *m) {
 			// 主区域窗口
 			r = MIN(n, nmasters) - i;
 			if (c->master_inner_per > 0.0f) {
-				h = (m->w.height - 2 * cur_gappov -
-					 cur_gappiv * ie * (master_num - 1)) *
-					c->master_inner_per;
+				h =  master_surplus_height * c->master_inner_per / master_surplus_ratio;
+				master_surplus_height = master_surplus_height - h;
+				master_surplus_ratio = master_surplus_ratio - c->master_inner_per;
 				c->master_mfact_per = mfact;
 			} else {
 				h = (m->w.height - my - cur_gappov -
@@ -521,9 +536,9 @@ void center_tile(Monitor *m) {
 				if ((stack_index % 2) ^ (n % 2 == 0)) {
 					// 右侧堆叠窗口
 					if (c->stack_innder_per > 0.0f) {
-						h = (m->w.height - 2 * cur_gappov -
-							 cur_gappiv * ie * ((stack_num + 1) / 2 - 1)) *
-							c->stack_innder_per;
+						h = slave_right_surplus_height * c->stack_innder_per / slave_right_surplus_ratio;
+						slave_right_surplus_height = slave_right_surplus_height - h;
+						slave_right_surplus_ratio = slave_right_surplus_ratio - c->stack_innder_per;
 						c->master_mfact_per = mfact;
 					} else {
 						h = (m->w.height - ety - cur_gappov -
@@ -547,9 +562,9 @@ void center_tile(Monitor *m) {
 				} else {
 					// 左侧堆叠窗口
 					if (c->stack_innder_per > 0.0f) {
-						h = (m->w.height - 2 * cur_gappov -
-							 cur_gappiv * ie * (stack_num / 2 - 1)) *
-							c->stack_innder_per;
+						h =  slave_left_surplus_height * c->stack_innder_per / slave_left_surplus_ratio;
+						slave_left_surplus_height = slave_left_surplus_height - h;
+						slave_left_surplus_ratio = slave_left_surplus_ratio - c->stack_innder_per;
 						c->master_mfact_per = mfact;
 					} else {
 						h = (m->w.height - oty - cur_gappov -
@@ -619,15 +634,26 @@ void tile(Monitor *m) {
 		mw = m->w.width - 2 * cur_gappoh + cur_gappih * ie;
 	i = 0;
 	my = ty = cur_gappov;
+
+	uint32_t master_surplus_height =
+		(m->w.height - 2 * cur_gappov - cur_gappiv * ie * (master_num - 1));
+	float master_surplus_ratio = 1.0;
+
+	uint32_t slave_surplus_height =
+		(m->w.height - 2 * cur_gappov - cur_gappiv * ie * (stack_num - 1));
+	float slave_surplus_ratio = 1.0;
+
 	wl_list_for_each(c, &clients, link) {
 		if (!VISIBLEON(c, m) || !ISTILED(c))
 			continue;
 		if (i < m->pertag->nmasters[m->pertag->curtag]) {
 			r = MIN(n, m->pertag->nmasters[m->pertag->curtag]) - i;
 			if (c->master_inner_per > 0.0f) {
-				h = (m->w.height - 2 * cur_gappov -
-					 cur_gappiv * ie * (master_num - 1)) *
-					c->master_inner_per;
+				h = master_surplus_height * c->master_inner_per /
+					master_surplus_ratio;
+				master_surplus_height = master_surplus_height - h;
+				master_surplus_ratio =
+					master_surplus_ratio - c->master_inner_per;
 				c->master_mfact_per = mfact;
 			} else {
 				h = (m->w.height - my - cur_gappov -
@@ -647,9 +673,10 @@ void tile(Monitor *m) {
 		} else {
 			r = n - i;
 			if (c->stack_innder_per > 0.0f) {
-				h = (m->w.height - 2 * cur_gappov -
-					 cur_gappiv * ie * (stack_num - 1)) *
-					c->stack_innder_per;
+				h = slave_surplus_height * c->stack_innder_per /
+					slave_surplus_ratio;
+				slave_surplus_height = slave_surplus_height - h;
+				slave_surplus_ratio = slave_surplus_ratio - c->stack_innder_per;
 				c->master_mfact_per = mfact;
 			} else {
 				h = (m->w.height - ty - cur_gappov -
@@ -717,15 +744,26 @@ void right_tile(Monitor *m) {
 		mw = m->w.width - 2 * cur_gappoh + cur_gappih * ie;
 	i = 0;
 	my = ty = cur_gappov;
+
+	uint32_t master_surplus_height =
+		(m->w.height - 2 * cur_gappov - cur_gappiv * ie * (master_num - 1));
+	float master_surplus_ratio = 1.0;
+
+	uint32_t slave_surplus_height =
+		(m->w.height - 2 * cur_gappov - cur_gappiv * ie * (stack_num - 1));
+	float slave_surplus_ratio = 1.0;
+
 	wl_list_for_each(c, &clients, link) {
 		if (!VISIBLEON(c, m) || !ISTILED(c))
 			continue;
 		if (i < m->pertag->nmasters[m->pertag->curtag]) {
 			r = MIN(n, m->pertag->nmasters[m->pertag->curtag]) - i;
 			if (c->master_inner_per > 0.0f) {
-				h = (m->w.height - 2 * cur_gappov -
-					 cur_gappiv * ie * (master_num - 1)) *
-					c->master_inner_per;
+				h = master_surplus_height * c->master_inner_per /
+					master_surplus_ratio;
+				master_surplus_height = master_surplus_height - h;
+				master_surplus_ratio =
+					master_surplus_ratio - c->master_inner_per;
 				c->master_mfact_per = mfact;
 			} else {
 				h = (m->w.height - my - cur_gappov -
@@ -746,9 +784,10 @@ void right_tile(Monitor *m) {
 		} else {
 			r = n - i;
 			if (c->stack_innder_per > 0.0f) {
-				h = (m->w.height - 2 * cur_gappov -
-					 cur_gappiv * ie * (stack_num - 1)) *
-					c->stack_innder_per;
+				h = slave_surplus_height * c->stack_innder_per /
+					slave_surplus_ratio;
+				slave_surplus_height = slave_surplus_height - h;
+				slave_surplus_ratio = slave_surplus_ratio - c->stack_innder_per;
 				c->master_mfact_per = mfact;
 			} else {
 				h = (m->w.height - ty - cur_gappov -
diff --git a/src/layout/vertical.h b/src/layout/vertical.h
index 713c385..3893a4c 100644
--- a/src/layout/vertical.h
+++ b/src/layout/vertical.h
@@ -41,15 +41,26 @@ void vertical_tile(Monitor *m) {
 
 	i = 0;
 	mx = tx = cur_gapih;
+
+	uint32_t master_surplus_width =
+		(m->w.width - 2 * cur_gapih - cur_gapih * ie * (master_num - 1));
+	float master_surplus_ratio = 1.0;
+
+	uint32_t slave_surplus_width =
+		(m->w.width - 2 * cur_gapih - cur_gapih * ie * (stack_num - 1));
+	float slave_surplus_ratio = 1.0;
+
 	wl_list_for_each(c, &clients, link) {
 		if (!VISIBLEON(c, m) || !ISTILED(c))
 			continue;
 		if (i < m->pertag->nmasters[m->pertag->curtag]) {
 			r = MIN(n, m->pertag->nmasters[m->pertag->curtag]) - i;
 			if (c->master_inner_per > 0.0f) {
-				w = (m->w.width - 2 * cur_gapih -
-					 cur_gapih * ie * (master_num - 1)) *
-					c->master_inner_per;
+				w = master_surplus_width * c->master_inner_per /
+					master_surplus_ratio;
+				master_surplus_width = master_surplus_width - w;
+				master_surplus_ratio =
+					master_surplus_ratio - c->master_inner_per;
 				c->master_mfact_per = mfact;
 			} else {
 				w = (m->w.width - mx - cur_gapih - cur_gapih * ie * (r - 1)) /
@@ -68,9 +79,10 @@ void vertical_tile(Monitor *m) {
 		} else {
 			r = n - i;
 			if (c->stack_innder_per > 0.0f) {
-				w = (m->w.width - 2 * cur_gapih -
-					 cur_gapih * ie * (stack_num - 1)) *
-					c->stack_innder_per;
+				w = slave_surplus_width * c->stack_innder_per /
+					slave_surplus_ratio;
+				slave_surplus_width = slave_surplus_width - w;
+				slave_surplus_ratio = slave_surplus_ratio - c->stack_innder_per;
 				c->master_mfact_per = mfact;
 			} else {
 				w = (m->w.width - tx - cur_gapih - cur_gapih * ie * (r - 1)) /