diff --git a/layouts/shortcodes/splice/calc_loop.html b/layouts/shortcodes/splice/calc_loop.html
index a5b1d0e..f4ecd4f 100644
--- a/layouts/shortcodes/splice/calc_loop.html
+++ b/layouts/shortcodes/splice/calc_loop.html
@@ -40,7 +40,7 @@ function Calculate(obj)
         <label for="loop_dia">Loop diameter (in centimeter)</label>
         <input type="number" min="0" step=".1" class="form-control form-control-lg" id="loop_dia" aria-describedby="emailHelp" placeholder="Enter loop diameter" onChange="Calculate(this.form)">
 
-        <input type="button" onClick="Calculate(this.form)" class="btn btn-primary">Calculate</input>
+        <input type="button" onClick="Calculate(this.form)" class="btn btn-primary" value="Calculate"/>
     </div>
     <hr>
     <div class="form-group">