diff --git a/driver/bk4819.c b/driver/bk4819.c
index 70f8a9be..75906547 100644
--- a/driver/bk4819.c
+++ b/driver/bk4819.c
@@ -456,7 +456,7 @@ void BK4819_PlayTone(uint16_t Frequency, bool bTuningGainSwitch)
 			| BK4819_REG_30_ENABLE_TX_DSP);
 			;
 
-	BK4819_WriteRegister(BK4819_REG_71, (uint16_t)(Frequency * 10.32444));
+	BK4819_WriteRegister(BK4819_REG_71, (uint16_t)((Frequency * 1032444) / 100000));
 }
 
 void BK4819_EnterTxMute(void)
@@ -694,7 +694,7 @@ void BK4819_TransmitTone(bool bLocalLoopback, uint32_t Frequency)
 	BK4819_WriteRegister(BK4819_REG_70, 0
 			| BK4819_REG_70_MASK_ENABLE_TONE1
 			| (96U << BK4819_REG_70_SHIFT_TONE1_TUNING_GAIN));
-	BK4819_WriteRegister(BK4819_REG_71, (uint16_t)(Frequency * 10.32444));
+	BK4819_WriteRegister(BK4819_REG_71, (uint16_t)((Frequency * 1032444) / 100000));
 	if (bLocalLoopback) {
 		BK4819_SetAF(BK4819_AF_BEEP);
 	} else {
@@ -946,7 +946,7 @@ void BK4819_GetVoxAmp(uint16_t *pResult)
 
 void BK4819_SetScrambleFrequencyControlWord(uint32_t Frequency)
 {
-	BK4819_WriteRegister(BK4819_REG_71, (uint16_t)(Frequency * 10.32444));
+	BK4819_WriteRegister(BK4819_REG_71, (uint16_t)((Frequency * 1032444) / 100000));
 }
 
 void BK4819_PlayDTMFEx(bool bLocalLoopback, char Code)
diff --git a/printf_config.h b/printf_config.h
index 2518a264..3e4070f4 100644
--- a/printf_config.h
+++ b/printf_config.h
@@ -1,3 +1,4 @@
 #define PRINTF_DISABLE_SUPPORT_LONG_LONG
 #define PRINTF_DISABLE_SUPPORT_EXPONENTIAL
 #define PRINTF_DISABLE_SUPPORT_PTRDIFF_T
+#define PRINTF_DISABLE_SUPPORT_FLOAT
diff --git a/ui/menu.c b/ui/menu.c
index 508aee6f..0f9566d3 100644
--- a/ui/menu.c
+++ b/ui/menu.c
@@ -216,7 +216,7 @@ void UI_DisplayMenu(void)
 		break;
 
 	case MENU_STEP:
-		sprintf(String, "%.2fKHz", gSubMenu_Step[gSubMenuSelection] * 0.01);
+		sprintf(String, "%d.%02dKHz", gSubMenu_Step[gSubMenuSelection] / 100, gSubMenu_Step[gSubMenuSelection] % 100);
 		break;
 
 	case MENU_TXP:
@@ -239,7 +239,7 @@ void UI_DisplayMenu(void)
 		if (gSubMenuSelection == 0) {
 			strcpy(String, "OFF");
 		} else {
-			sprintf(String, "%.1fHz", CTCSS_Options[gSubMenuSelection - 1] * 0.1);
+			sprintf(String, "%d.%dHz", CTCSS_Options[gSubMenuSelection - 1] / 10, CTCSS_Options[gSubMenuSelection - 1] % 10);
 		}
 		break;
 
@@ -249,7 +249,7 @@ void UI_DisplayMenu(void)
 
 	case MENU_OFFSET:
 		if (!gIsInSubMenu || gInputBoxIndex == 0) {
-			sprintf(String, "%.5f", gSubMenuSelection * 1e-05);
+			sprintf(String, "%d.%05d", gSubMenuSelection / 100000, gSubMenuSelection % 100000);
 			break;
 		}
 		for (i = 0; i < 3; i++) {
@@ -412,7 +412,7 @@ void UI_DisplayMenu(void)
 		break;
 
 	case MENU_VOL:
-		sprintf(String, "%.2fV", gBatteryVoltageAverage * 0.01);
+		sprintf(String, "%d.%02dV", gBatteryVoltageAverage / 100, gBatteryVoltageAverage % 100);
 		break;
 
 	case MENU_RESET:
diff --git a/ui/scanner.c b/ui/scanner.c
index 2d6ec2e7..e93ca5fb 100644
--- a/ui/scanner.c
+++ b/ui/scanner.c
@@ -34,7 +34,7 @@ void UI_DisplayScanner(void)
 	memset(String, 0, sizeof(String));
 
 	if (gScanSingleFrequency || (gScanCssState != SCAN_CSS_STATE_OFF && gScanCssState != SCAN_CSS_STATE_FAILED)) {
-		sprintf(String, "FREQ:%.5f", gScanFrequency * 1e-05);
+		sprintf(String, "FREQ:%d.%05d", gScanFrequency / 100000, gScanFrequency % 100000);
 	} else {
 		sprintf(String, "FREQ:**.*****");
 	}
@@ -44,7 +44,7 @@ void UI_DisplayScanner(void)
 	if (gScanCssState < SCAN_CSS_STATE_FOUND || !gScanUseCssResult) {
 		sprintf(String, "CTC:******");
 	} else if (gScanCssResultType == CODE_TYPE_CONTINUOUS_TONE) {
-		sprintf(String, "CTC:%.1fHz", CTCSS_Options[gScanCssResultCode] * 0.1);
+		sprintf(String, "CTC:%d.%dHz", CTCSS_Options[gScanCssResultCode] / 10, CTCSS_Options[gScanCssResultCode] % 10);
 	} else {
 		sprintf(String, "DCS:D%03oN", DCS_Options[gScanCssResultCode]);
 	}
diff --git a/ui/welcome.c b/ui/welcome.c
index 5e2c3225..d495cdbb 100644
--- a/ui/welcome.c
+++ b/ui/welcome.c
@@ -39,7 +39,7 @@ void UI_DisplayWelcome(void)
 		memset(WelcomeString1, 0, sizeof(WelcomeString1));
 		if (gEeprom.POWER_ON_DISPLAY_MODE == POWER_ON_DISPLAY_MODE_VOLTAGE) {
 			sprintf(WelcomeString0, "VOLTAGE");
-			sprintf(WelcomeString1, "%.2fV", gBatteryVoltageAverage * 0.01);
+			sprintf(WelcomeString1, "%d.%02dV", gBatteryVoltageAverage / 100, gBatteryVoltageAverage % 100);
 		} else {
 			EEPROM_ReadBuffer(0x0EB0, WelcomeString0, 16);
 			EEPROM_ReadBuffer(0x0EC0, WelcomeString1, 16);