diff --git a/ultralytics/utils/metrics.py b/ultralytics/utils/metrics.py
index 235db567..b5988110 100644
--- a/ultralytics/utils/metrics.py
+++ b/ultralytics/utils/metrics.py
@@ -64,6 +64,9 @@ def box_iou(box1, box2, eps=1e-7):
         (torch.Tensor): An NxM tensor containing the pairwise IoU values for every element in box1 and box2.
     """
 
+    # NOTE: need float32 to get accurate iou values
+    box1 = torch.as_tensor(box1, dtype=torch.float32)
+    box2 = torch.as_tensor(box2, dtype=torch.float32)
     # inter(N,M) = (rb(N,M,2) - lt(N,M,2)).clamp(0).prod(2)
     (a1, a2), (b1, b2) = box1.unsqueeze(1).chunk(2, 2), box2.unsqueeze(0).chunk(2, 2)
     inter = (torch.min(a2, b2) - torch.max(a1, b1)).clamp_(0).prod(2)