diff --git a/esphome/components/modbus_controller/number/modbus_number.cpp b/esphome/components/modbus_controller/number/modbus_number.cpp
index 5e977f5df4..a0e990d272 100644
--- a/esphome/components/modbus_controller/number/modbus_number.cpp
+++ b/esphome/components/modbus_controller/number/modbus_number.cpp
@@ -57,9 +57,11 @@ void ModbusNumber::control(float value) {
   // Create and send the write command
   ModbusCommandItem write_cmd;
   if (this->register_count == 1 && !this->use_write_multiple_) {
-    write_cmd = ModbusCommandItem::create_write_single_command(parent_, this->start_address + this->offset, data[0]);
+    // since offset is in bytes and a register is 16 bits we get the start by adding offset/2
+    write_cmd =
+        ModbusCommandItem::create_write_single_command(parent_, this->start_address + this->offset / 2, data[0]);
   } else {
-    write_cmd = ModbusCommandItem::create_write_multiple_command(parent_, this->start_address + this->offset,
+    write_cmd = ModbusCommandItem::create_write_multiple_command(parent_, this->start_address + this->offset / 2,
                                                                  this->register_count, data);
   }
   // publish new value