diff --git a/conversions/bmi_conversion.py b/conversions/bmi_conversion.py
new file mode 100644
index 000000000000..4fd442674d49
--- /dev/null
+++ b/conversions/bmi_conversion.py
@@ -0,0 +1,31 @@
+"""Converts height and mass to Body Mass Index"""
+
+
+def metric_units_bmi(kg: int, cm: int) -> int:
+    """
+    Convert mass in kilograms and height in centimetres to Body Mass Index
+    >>> metric_units_bmi(50, 160)
+    19.53
+    >>> metric_units_bmi(80, 175)
+    26.12
+    """
+    metre_square = (cm / 100) ** 2
+    return round(kg / metre_square, 2)
+
+
+def us_units_bmi(pounds: int, inches: int) -> int:
+    """
+    Convert mass in pounds and height in inches to Body Mass Index
+    >>> us_units_bmi(200, 75)
+    25.0
+    >>> us_units_bmi(130, 65)
+    21.63
+    """
+    inches_square = inches ** 2
+    return round(703 * (pounds / inches_square), 2)
+
+
+if __name__ == "__main__":
+    import doctest
+
+    doctest.testmod()