diff --git a/dts/arm/st/mem.h b/dts/arm/st/mem.h
index 76a04c484ba..e5f887da08f 100644
--- a/dts/arm/st/mem.h
+++ b/dts/arm/st/mem.h
@@ -1,27 +1,32 @@
 #ifndef __DT_BINDING_ST_MEM_H
 #define __DT_BINDING_ST_MEM_H
 
+#define __SIZE_K(x) (x * 1024)
+
 #if defined(CONFIG_SOC_STM32F103XB)
-#define DT_FLASH_SIZE		0x20000
-#define DT_SRAM_SIZE		0x5000
+#define DT_FLASH_SIZE		__SIZE_K(128)
+#define DT_SRAM_SIZE		__SIZE_K(20)
 #elif defined(CONFIG_SOC_STM32F103XE)
-#define DT_FLASH_SIZE		0x80000
-#define DT_SRAM_SIZE		0x10000
+#define DT_FLASH_SIZE		__SIZE_K(512)
+#define DT_SRAM_SIZE		__SIZE_K(64)
 #elif defined(CONFIG_SOC_STM32F107XC)
-#define DT_FLASH_SIZE		0x40000
-#define DT_SRAM_SIZE		0x10000
+#define DT_FLASH_SIZE		__SIZE_K(256)
+#define DT_SRAM_SIZE		__SIZE_K(64)
 #elif defined(CONFIG_SOC_STM32F334X8)
-#define DT_FLASH_SIZE		0x10000
-#define DT_SRAM_SIZE		0x3000
+#define DT_FLASH_SIZE		__SIZE_K(64)
+#define DT_SRAM_SIZE		__SIZE_K(12)
 #elif defined(CONFIG_SOC_STM32F373XC)
-#define DT_FLASH_SIZE		0x40000
-#define DT_SRAM_SIZE		0x8000
-#elif defined(CONFIG_SOC_STM32F401XE) || defined(CONFIG_SOC_STM32F411XE)
-#define DT_FLASH_SIZE		0x80000
-#define DT_SRAM_SIZE		0x18000
+#define DT_FLASH_SIZE		__SIZE_K(256)
+#define DT_SRAM_SIZE		__SIZE_K(32)
+#elif defined(CONFIG_SOC_STM32F401XE)
+#define DT_FLASH_SIZE		__SIZE_K(512)
+#define DT_SRAM_SIZE		__SIZE_K(96)
+#elif defined(CONFIG_SOC_STM32F411XE)
+#define DT_FLASH_SIZE		__SIZE_K(512)
+#define DT_SRAM_SIZE		__SIZE_K(128)
 #elif defined(CONFIG_SOC_STM32L476XX)
-#define DT_FLASH_SIZE		0x100000
-#define DT_SRAM_SIZE		0x18000
+#define DT_FLASH_SIZE		__SIZE_K(1024)
+#define DT_SRAM_SIZE		__SIZE_K(96)
 #else
 #error "Flash and RAM sizes not defined for this chip"
 #endif