diff --git a/Firmware/EggbotWireless/include/Config.h b/Firmware/EggbotWireless/include/Config.h
index 27f4128..24e152e 100644
--- a/Firmware/EggbotWireless/include/Config.h
+++ b/Firmware/EggbotWireless/include/Config.h
@@ -4,6 +4,9 @@
 constexpr int pin12v{5};
 constexpr int i2cTimeout{10}, i2cTimeoutTries{10};
 constexpr int lastStsTTL{10};
+
+constexpr float battR1{12}, battR2{2.2};
+
 constexpr unsigned long powerTimeout{20000}, powerStartupDelay{100};
 
 constexpr const char *defSSID{"eggbot"}, *defPass{"eggbotwi"},
diff --git a/Firmware/EggbotWireless/src/WebAPI.cpp b/Firmware/EggbotWireless/src/WebAPI.cpp
index ac64cbc..a35aa1b 100644
--- a/Firmware/EggbotWireless/src/WebAPI.cpp
+++ b/Firmware/EggbotWireless/src/WebAPI.cpp
@@ -1,10 +1,13 @@
 #include "WebAPI.h"
+#include "Config.h"
 #include "QueueManager.h"
 
 ESP8266WebServer server(80);
 
 WebAPI::WebAPI() {}
 
+float getVin(float r1, float r2, float vout) { return ((r1 + r2) * vout) / r2; }
+
 String WebAPI::getStatusJson() {
     StaticJsonDocument<256> doc;
     Status status = executor.status();
@@ -17,7 +20,7 @@ String WebAPI::getStatusJson() {
     doc["mmS"] = status.mmS;
     doc["pEng"] = status.pEng;
     doc["xLim"] = status.xLim;
-    doc["batt"] = analogRead(A0);
+    doc["batt"] = getVin(battR1, battR2, analogRead(A0) / 1000.0);
 
     String out;
     serializeJson(doc, out);