diff --git a/conversions/ounces_to_grams.py b/conversions/ounces_to_grams.py
new file mode 100644
index 000000000000..f40fba23fe79
--- /dev/null
+++ b/conversions/ounces_to_grams.py
@@ -0,0 +1,25 @@
+"""
+Convert ounces to grams.
+
+This conversion uses the avoirdupois ounce:
+1 ounce = 28.3495 grams
+"""
+
+
+def ounces_to_grams(ounces: float) -> float:
+    """
+    Convert ounces to grams.
+
+    :param ounces: Weight in ounces
+    :return: Weight in grams
+    """
+    if ounces < 0:
+        raise ValueError("Weight cannot be negative")
+
+    return ounces * 28.3495
+
+
+if __name__ == "__main__":
+    ounces = float(input("Enter weight in ounces: "))
+    grams = ounces_to_grams(ounces)
+    print(f"{ounces} ounces is equal to {grams:.2f} grams")