diff --git a/cara/apps/calculator/static/form.html b/cara/apps/calculator/static/form.html
index 0bcc2d4c..22059db8 100644
--- a/cara/apps/calculator/static/form.html
+++ b/cara/apps/calculator/static/form.html
@@ -30,8 +30,8 @@ Beta v1.0.0 <span style="float:right; font-weight:bold">Please send feedback to
     <input type="radio" id="room_type_volume" name="volume_type" value="room_volume" onclick="require_fields(this)" required>
     Room volume: &nbsp;&nbsp; <input type="number" step=0.01 id="room_volume" name="room_volume" placeholder="Room volume (m³)" min="0.01"><br>
     <input type="radio" id="room_type_dimensions" name="volume_type" value="room_dimensions" onclick="require_fields(this)" required>
-    Floor area: &nbsp;&nbsp; <input type="number" step=0.01 id="floor_area" name="floor_area" placeholder="Room floor area (m²)" min="0"><br>
-    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ceiling height: &nbsp;&nbsp; <input type="number" step=0.01 id="ceiling_height" name="ceiling_height" placeholder="Room ceiling height (m²)" min="0"><br>
+    Floor area: &nbsp;&nbsp; <input type="number" step=0.01 id="floor_area" name="floor_area" placeholder="Room floor area (m²)" min="0.01"><br>
+    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Ceiling height: &nbsp;&nbsp; <input type="number" step=0.01 id="ceiling_height" name="ceiling_height" placeholder="Room ceiling height (m²)" min="0.01"><br>
     <hr width="80%">
 
     <!-- Ventilation Options -->