diff --git a/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_adv.c b/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_adv.c
index bd0eebfc708..d30c0359ddf 100644
--- a/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_adv.c
+++ b/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_adv.c
@@ -83,9 +83,9 @@ static inline bool isr_rx_ci_adva_check(uint8_t tx_addr, uint8_t *addr,
 					struct pdu_adv *ci);
 
 #if defined(CONFIG_BT_CTLR_ADV_EXT)
-#define PAYLOAD_BASED_FRAG_COUNT ((CONFIG_BT_CTLR_ADV_DATA_LEN_MAX + \
-				   PDU_AC_PAYLOAD_SIZE_MAX - 1) / \
-				  PDU_AC_PAYLOAD_SIZE_MAX)
+#define PAYLOAD_BASED_FRAG_COUNT \
+	ceiling_fraction(CONFIG_BT_CTLR_ADV_DATA_LEN_MAX, \
+			 PDU_AC_PAYLOAD_SIZE_MAX)
 #define PAYLOAD_FRAG_COUNT MAX(PAYLOAD_BASED_FRAG_COUNT, BT_CTLR_DF_PER_ADV_CTE_NUM_MAX)
 #define BT_CTLR_ADV_AUX_SET  CONFIG_BT_CTLR_ADV_AUX_SET
 #if defined(CONFIG_BT_CTLR_ADV_PERIODIC)
diff --git a/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_test.c b/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_test.c
index 314bb625417..6aea369bdb0 100644
--- a/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_test.c
+++ b/subsys/bluetooth/controller/ll_sw/nordic/lll/lll_test.c
@@ -106,8 +106,7 @@ static void isr_tx(void *param)
 
 	/* LE Test Packet Interval */
 	l = radio_tmr_end_get() - radio_tmr_ready_get();
-	i = ((l + 249 + (SCAN_INT_UNIT_US - 1)) / SCAN_INT_UNIT_US) *
-		SCAN_INT_UNIT_US;
+	i = ceiling_fraction((l + 249), SCAN_INT_UNIT_US) * SCAN_INT_UNIT_US;
 	t = radio_tmr_end_get() - l + i;
 	t -= radio_tx_ready_delay_get(test_phy, test_phy_flags);
 
diff --git a/subsys/bluetooth/controller/ll_sw/openisa/lll/lll_adv.c b/subsys/bluetooth/controller/ll_sw/openisa/lll/lll_adv.c
index 4a32ffe1f65..1c0663380da 100644
--- a/subsys/bluetooth/controller/ll_sw/openisa/lll/lll_adv.c
+++ b/subsys/bluetooth/controller/ll_sw/openisa/lll/lll_adv.c
@@ -79,9 +79,9 @@ static inline bool isr_rx_ci_adva_check(struct pdu_adv *adv,
 					struct pdu_adv *ci);
 
 #if defined(CONFIG_BT_CTLR_ADV_EXT)
-#define PAYLOAD_FRAG_COUNT   ((CONFIG_BT_CTLR_ADV_DATA_LEN_MAX + \
-			       PDU_AC_PAYLOAD_SIZE_MAX - 1) / \
-			      PDU_AC_PAYLOAD_SIZE_MAX)
+#define PAYLOAD_BASED_FRAG_COUNT \
+	ceiling_fraction(CONFIG_BT_CTLR_ADV_DATA_LEN_MAX, \
+			 PDU_AC_PAYLOAD_SIZE_MAX)
 #define BT_CTLR_ADV_AUX_SET  CONFIG_BT_CTLR_ADV_AUX_SET
 #if defined(CONFIG_BT_CTLR_ADV_PERIODIC)
 #define BT_CTLR_ADV_SYNC_SET CONFIG_BT_CTLR_ADV_SYNC_SET
diff --git a/subsys/bluetooth/controller/ll_sw/openisa/lll/lll_test.c b/subsys/bluetooth/controller/ll_sw/openisa/lll/lll_test.c
index 485b130e834..1e805a38f2f 100644
--- a/subsys/bluetooth/controller/ll_sw/openisa/lll/lll_test.c
+++ b/subsys/bluetooth/controller/ll_sw/openisa/lll/lll_test.c
@@ -102,8 +102,7 @@ static void isr_tx(void *param)
 
 	/* LE Test Packet Interval */
 	l = radio_tmr_end_get() - radio_tmr_ready_get();
-	i = ((l + 249 + (SCAN_INT_UNIT_US - 1)) / SCAN_INT_UNIT_US) *
-		SCAN_INT_UNIT_US;
+	i = ceiling_fraction((l + 249), SCAN_INT_UNIT_US) * SCAN_INT_UNIT_US;
 	t = radio_tmr_end_get() - l + i;
 	t -= radio_tx_ready_delay_get(test_phy, test_phy_flags);
 
diff --git a/subsys/bluetooth/controller/ll_sw/ull_adv.c b/subsys/bluetooth/controller/ll_sw/ull_adv.c
index 2b5abbb6209..1f35a38bb77 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_adv.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_adv.c
@@ -1221,9 +1221,8 @@ uint8_t ll_adv_enable(uint8_t enable)
 		interval_min_us = time_us +
 				  (scan_delay + scan_window) * USEC_PER_MSEC;
 		if ((interval * SCAN_INT_UNIT_US) < interval_min_us) {
-			interval = (interval_min_us +
-				(SCAN_INT_UNIT_US - 1)) /
-				SCAN_INT_UNIT_US;
+			interval = ceiling_fraction(interval_min_us,
+						    SCAN_INT_UNIT_US);
 		}
 
 		/* passive scanning */
diff --git a/subsys/bluetooth/controller/ll_sw/ull_adv_iso.c b/subsys/bluetooth/controller/ll_sw/ull_adv_iso.c
index b7ef309dadd..71858b19922 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_adv_iso.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_adv_iso.c
@@ -183,11 +183,10 @@ uint8_t ll_big_create(uint8_t big_handle, uint8_t adv_handle, uint8_t num_bis,
 	lll_adv_iso->num_bis = num_bis;
 
 	/* BN (Burst Count), Mandatory BN = 1 */
-	bn = (max_sdu + (lll_adv_iso->max_pdu - 1U)) / lll_adv_iso->max_pdu;
+	bn = ceiling_fraction(max_sdu, lll_adv_iso->max_pdu);
 	if (bn > PDU_BIG_BN_MAX) {
 		lll_adv_iso->bn = PDU_BIG_BN_MAX;
-		bn = ((bn + (PDU_BIG_BN_MAX - 1)) / PDU_BIG_BN_MAX) *
-		     PDU_BIG_BN_MAX;
+		bn = ceiling_fraction(bn, PDU_BIG_BN_MAX) * PDU_BIG_BN_MAX;
 	} else {
 		lll_adv_iso->bn = bn;
 	}
diff --git a/subsys/bluetooth/controller/ll_sw/ull_conn.c b/subsys/bluetooth/controller/ll_sw/ull_conn.c
index 91cca1c3bb3..7ac8f075eaf 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_conn.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_conn.c
@@ -3126,9 +3126,9 @@ static inline int event_conn_upd_prep(struct ll_conn *conn, uint16_t lazy,
 				instant_latency;
 
 			lll->periph.window_widening_periodic_us =
-				(((lll_clock_ppm_local_get() +
-				   lll_clock_ppm_get(conn->periph.sca)) *
-				  conn_interval_us) + (1000000 - 1)) / 1000000U;
+				ceiling_fraction(((lll_clock_ppm_local_get() +
+					lll_clock_ppm_get(conn->periph.sca)) *
+					conn_interval_us), USEC_PER_SEC);
 			lll->periph.window_widening_max_us =
 				(conn_interval_us >> 1) - EVENT_IFS_US;
 			lll->periph.window_size_prepare_us =
diff --git a/subsys/bluetooth/controller/ll_sw/ull_peripheral.c b/subsys/bluetooth/controller/ll_sw/ull_peripheral.c
index 2af494d7e38..9c3e84a5be0 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_peripheral.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_peripheral.c
@@ -190,9 +190,9 @@ void ull_periph_setup(struct node_rx_hdr *rx, struct node_rx_ftr *ftr,
 	/* calculate the window widening */
 	conn->periph.sca = pdu_adv->connect_ind.sca;
 	lll->periph.window_widening_periodic_us =
-		(((lll_clock_ppm_local_get() +
-		   lll_clock_ppm_get(conn->periph.sca)) *
-		  conn_interval_us) + (1000000 - 1)) / 1000000U;
+		ceiling_fraction(((lll_clock_ppm_local_get() +
+				   lll_clock_ppm_get(conn->periph.sca)) *
+				  conn_interval_us), USEC_PER_SEC);
 	lll->periph.window_widening_max_us = (conn_interval_us >> 1) -
 					    EVENT_IFS_US;
 	lll->periph.window_size_event_us = pdu_adv->connect_ind.win_size *
diff --git a/subsys/bluetooth/controller/ll_sw/ull_sync.c b/subsys/bluetooth/controller/ll_sw/ull_sync.c
index 1cb1ee90aae..517329229db 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_sync.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_sync.c
@@ -579,8 +579,9 @@ void ull_sync_setup(struct ll_scan_set *scan, struct ll_scan_aux_set *aux,
 #endif /* CONFIG_BT_CTLR_SYNC_ISO */
 
 	lll->window_widening_periodic_us =
-		(((lll_clock_ppm_local_get() + lll_clock_ppm_get(sca)) *
-		  interval_us) + (1000000 - 1)) / 1000000U;
+		ceiling_fraction(((lll_clock_ppm_local_get() +
+				   lll_clock_ppm_get(sca)) *
+				  interval_us), USEC_PER_SEC);
 	lll->window_widening_max_us = (interval_us >> 1) - EVENT_IFS_US;
 	if (si->offs_units) {
 		lll->window_size_event_us = OFFS_UNIT_300_US;
diff --git a/subsys/bluetooth/controller/ll_sw/ull_sync_iso.c b/subsys/bluetooth/controller/ll_sw/ull_sync_iso.c
index c1891f3209a..1959e286890 100644
--- a/subsys/bluetooth/controller/ll_sw/ull_sync_iso.c
+++ b/subsys/bluetooth/controller/ll_sw/ull_sync_iso.c
@@ -335,8 +335,9 @@ void ull_sync_iso_setup(struct ll_sync_iso_set *sync_iso,
 
 	sca = sync_iso->sync->lll.sca;
 	lll->window_widening_periodic_us =
-		(((lll_clock_ppm_local_get() + lll_clock_ppm_get(sca)) *
-		  interval_us) + (1000000 - 1)) / 1000000U;
+		ceiling_fraction(((lll_clock_ppm_local_get() +
+				   lll_clock_ppm_get(sca)) *
+				 interval_us), USEC_PER_SEC);
 	lll->window_widening_max_us = (interval_us >> 1) - EVENT_IFS_US;
 	if (bi->offs_units) {
 		lll->window_size_event_us = 300U;