diff --git a/index.html b/index.html
index a35a5355..ba8191f6 100644
--- a/index.html
+++ b/index.html
@@ -5,6 +5,11 @@
   <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
   <title>Loot Table Generator</title>
   <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.2.1/css/bootstrap.min.css" integrity="sha384-GJzZqFGwb1QTTN6wy59ffF1BuGJpLSa9DkKMp0DgiMDm4iYMj70gZWKYbI706tWS" crossorigin="anonymous">
+  <style media="screen">
+    .dropdown-item {
+      cursor: pointer;
+    }
+  </style>
 </head>
 <body>
   <nav class="navbar navbar-dark bg-dark">
@@ -47,11 +52,25 @@
         <button type="button" class="btn btn-outline-success mr-3 mb-2 float-left">Add Condition</button>
       </div>
       <div class="card-body">
-        <div class="input-group">
+        <div class="input-group mb-3 rolls">
           <div class="input-group-prepend">
             <span class="input-group-text">Rolls</span>
+            <button type="button" class="btn btn-outline-secondary dropdown-toggle dropdown-toggle-split" data-toggle="dropdown">
+            <div class="dropdown-menu">
+              <a class="dropdown-item" onclick="switchExact(this)">Exact</a>
+              <a class="dropdown-item" onclick="switchRange(this)">Range</a>
+              <a class="dropdown-item" onclick="switchBinomial(this)">Binomial</a>
+            </div>
           </div>
-          <input type="text" class="form-control" onchange="updateRollsField(this)" value="1">
+          <input type="text" class="form-control exact" onchange="updateRollsField(this)" value="1">
+          <span class="input-group-text rounded-0 range d-none">Min</span>
+          <input type="text" class="form-control range min d-none" value="1" onchange="updateRollsField(this)">
+          <span class="input-group-text rounded-0 range d-none">Max</span>
+          <input type="text" class="form-control range max d-none" value="2" onchange="updateRollsField(this)">
+          <span class="input-group-text rounded-0 binomial d-none">n</span>
+          <input type="text" class="form-control binomial n d-none" value="1" onchange="updateRollsField(this)">
+          <span class="input-group-text rounded-0 binomial d-none">p</span>
+          <input type="text" class="form-control binomial p d-none" value="2" onchange="updateRollsField(this)">
         </div>
       </div>
     </div>
diff --git a/script.js b/script.js
index 848c0478..578c7aa0 100644
--- a/script.js
+++ b/script.js
@@ -19,7 +19,7 @@ function addPool(el) {
 }
 
 function removePool(el) {
-  let $pool = $(el).parent().parent();
+  let $pool = $(el).closest('.pool');
   table.pools.pop($pool.attr('data-index'));
   $('#structure .pool').each((i, el) => {
     if ($(el).attr('data-index') > $pool.attr('data-index')) {
@@ -30,6 +30,59 @@ function removePool(el) {
   invalidated();
 }
 
+function updateRollsField(el) {
+  let $pool = $(el).closest('.pool')
+  let $rolls = $(el).closest('.rolls');
+  let data = parseInt($rolls.find('.exact').val());
+  if ($rolls.attr('data-type') === 'range') {
+    data = {};
+    let min = $rolls.find('.range.min').val();
+    let max = $rolls.find('.range.max').val();
+    if (min) data.min = parseInt(min);
+    if (max) data.max = parseInt(max);
+  } else if ($rolls.attr('data-type') === 'binomial') {
+    data = {type: "minecraft:binomial"};
+    let n = $rolls.find('.binomial.n').val();
+    let p = $rolls.find('.binomial.p').val();
+    if (n) data.n = parseInt(n);
+    if (p) data.p = parseFloat(p);
+  }
+  table.pools[$pool.attr('data-index')].rolls = data;
+  invalidated();
+}
+
+function switchExact(el) {
+  let $rolls = $(el).closest('.rolls');
+  $rolls.attr('data-type', 'exact');
+  $rolls.find('.exact').removeClass('d-none');
+  $rolls.find('.range').addClass('d-none');
+  $rolls.find('.binomial').addClass('d-none');
+  updateRollsField(el);
+}
+
+function switchRange(el) {
+  let $rolls = $(el).closest('.rolls');
+  $rolls.attr('data-type', 'range');
+  $rolls.find('.exact').addClass('d-none');
+  $rolls.find('.range').removeClass('d-none');
+  $rolls.find('.binomial').addClass('d-none');
+  updateRollsField(el);
+}
+
+function switchBinomial(el) {
+  let $rolls = $(el).closest('.rolls');
+  $rolls.attr('data-type', 'binomial');
+  $rolls.find('.exact').addClass('d-none');
+  $rolls.find('.range').addClass('d-none');
+  $rolls.find('.binomial').removeClass('d-none');
+  updateRollsField(el);
+}
+
+function invalidated() {
+  $('#source').val(JSON.stringify(table, null, indentation));
+  $('#source').autogrow();
+}
+
 function updateIndentation(el) {
   if (el.value === 'tab') {
     indentation = '\t';
@@ -39,18 +92,6 @@ function updateIndentation(el) {
   invalidated();
 }
 
-function updateRollsField(el) {
-  let $pool = $(el).parent().parent().parent();
-  let value = parseInt($(el).val());
-  table.pools[$pool.attr('data-index')].rolls = value;
-  invalidated();
-}
-
-function invalidated() {
-  $('#source').val(JSON.stringify(table, null, indentation));
-  $('#source').autogrow();
-}
-
 function copySource(el) {
   $('#source').get()[0].select();
   document.execCommand('copy');
