diff --git a/.idea/vcs.xml b/.idea/vcs.xml
new file mode 100644
index 0000000..35eb1dd
--- /dev/null
+++ b/.idea/vcs.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>
\ No newline at end of file
diff --git a/conversion.iml b/conversion.iml
index 4b044f1..400d910 100644
--- a/conversion.iml
+++ b/conversion.iml
@@ -13,5 +13,7 @@
     <orderEntry type="sourceFolder" forTests="false" />
     <orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.12" level="project" />
     <orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
+    <orderEntry type="library" scope="TEST" name="Maven: junit:junit:4.12" level="project" />
+    <orderEntry type="library" scope="TEST" name="Maven: org.hamcrest:hamcrest-core:1.3" level="project" />
   </component>
 </module>
\ No newline at end of file
diff --git a/src/main/java/ConversionTool.java b/src/main/java/ConversionTool.java
index df73653..22ce713 100644
--- a/src/main/java/ConversionTool.java
+++ b/src/main/java/ConversionTool.java
@@ -1,21 +1,72 @@
+
+
 public class ConversionTool {
 
 
-    public static void main(String[] args){}
+    public static void main(String[] args) {
+    }
+
+    public static float CentimetersToInches(float centimeters) {
+        double inches_per_cm = 0.393701;
+        if (centimeters < 0) {
+            return 0;
+        } else {
+            return (float) (centimeters * inches_per_cm);
+        }
+    }
 
-    public static float CentimetersToInches(float centimeters){}
+    public static float InchesToCentimeters(float inches) {
+        double cm_per_inch = 2.54;
+        if (inches < 0) {
+            return 0;
+        } else {
+            return (float) (inches * cm_per_inch);
+        }
+    }
 
-    public static float InchesToCentimeters(float inches){}
+    public static float FeetToMeters(float feet) {
+        double Meters_Per_Foot = 0.3048;
+        if (feet < 0) {
+            return 0;
+        } else {
 
-    public static float FeetToMeters(float feet){}
+            return (float) (feet * Meters_Per_Foot);
+        }
+    }
 
-    public static float MetersToFeet(float meters){}
+    public static float MetersToFeet(float meters) {
+        double Feet_Per_Meter = 3.28084;
+        if (meters < 0) {
+            return 0;
+        } else {
+            return (float) (meters * Feet_Per_Meter);
+        }
+    }
 
-    public static float CelsiusToFahrenheit(float celsius){}
+    public static float CelsiusToFahrenheit(float celsius) {
+       return (float) ((celsius * 9/5) + 32);
+    }
 
-    public static float FahrenheitToCelsius(float fahrenheit){}
+    public static float FahrenheitToCelsius(float fahrenheit) {
+        double fahren_to_cels = (- 32) * 5/9;
+        return (float) ((fahrenheit - 32) * 5/9);
+    }
 
-    public static float MphToKph(float mph){}
+    public static float MphToKph(float mph) {
+        double KPH_PER_MPH = 1 / 0.621371;
+        if (mph < 0) {
+            return 0;
+        } else {
+            return (float) (KPH_PER_MPH * mph);
+        }
+    }
 
-    public static float KphToMph(float kph){}
+    public static float KphToMph(float kph) {
+        double MPH_PER_KPH = 0.621371;
+        if (kph < 0) {
+            return 0;
+        } else {
+            return (float) (kph * MPH_PER_KPH);
+        }
+    }
 }
diff --git a/target/classes/ConversionTool.class b/target/classes/ConversionTool.class
index 7d20ebc..6ec2ce1 100644
Binary files a/target/classes/ConversionTool.class and b/target/classes/ConversionTool.class differ