diff --git a/sources/conversions/conversions.py b/sources/conversions/conversions.py
new file mode 100644
index 0000000..568a4cc
--- /dev/null
+++ b/sources/conversions/conversions.py
@@ -0,0 +1,38 @@
+import sys
+
+
+def convert(value, unit_in, unit_out):
+    coefficient = get_coefficient(unit_in, unit_out)
+    return value * coefficient
+
+
+def get_coefficient(unit_in, unit_out):
+    distances = {"km": 1 / 1000, "miles": 1 / 1609, "m": 1}
+
+    reciprocal_coefficient = 1 / distances[unit_in]
+
+    return distances[unit_out] * reciprocal_coefficient
+
+
+def main():
+    try:
+        value = sys.argv[1]
+        unit_in = sys.argv[2]
+        unit_out = sys.argv[3]
+
+    except IndexError:
+        print("Pas assez d'arguments")
+        sys.exit(1)
+
+    try:
+        value = float(value)
+    except ValueError:
+        print("Le premier argument doit être un nombre")
+        sys.exit(1)
+
+    result = convert(value, unit_in, unit_out)
+    print(f"{result:.2f}")
+
+
+if __name__ == "__main__":
+    main()