diff --git a/lib/chai/interface/assert.js b/lib/chai/interface/assert.js
index c8ea79566..98067b04d 100644
--- a/lib/chai/interface/assert.js
+++ b/lib/chai/interface/assert.js
@@ -243,6 +243,25 @@ module.exports = function (chai, util) {
     new Assertion(val, msg).to.be.above(abv);
   };
 
+   /**
+   * ### .isAtLeast(valueToCheck, valueToBeAtLeast, [message])
+   *
+   * Asserts `valueToCheck` is greater than or equal to (>=) `valueToBeAtLeast`
+   *
+   *     assert.isAtLeast(5, 2, '5 is greater or equal to 2');
+   *     assert.isAtLeast(3, 3, '3 is greater or equal to 3');
+   *
+   * @name isAtLeast
+   * @param {Mixed} valueToCheck
+   * @param {Mixed} valueToBeAtLeast
+   * @param {String} message
+   * @api public
+   */
+
+  assert.isAtLeast = function (val, atlst, msg) {
+    new Assertion(val, msg).to.be.least(atlst);
+  };
+
    /**
    * ### .isBelow(valueToCheck, valueToBeBelow, [message])
    *
@@ -261,6 +280,25 @@ module.exports = function (chai, util) {
     new Assertion(val, msg).to.be.below(blw);
   };
 
+   /**
+   * ### .isAtMost(valueToCheck, valueToBeAtMost, [message])
+   *
+   * Asserts `valueToCheck` is less than or equal to (<=) `valueToBeAtMost`
+   *
+   *     assert.isAtMost(3, 6, '3 is less than or equal to 6');
+   *     assert.isAtMost(4, 4, '4 is less than or equal to 4');
+   *
+   * @name isAtMost
+   * @param {Mixed} valueToCheck
+   * @param {Mixed} valueToBeAtMost
+   * @param {String} message
+   * @api public
+   */
+
+  assert.isAtMost = function (val, atmst, msg) {
+    new Assertion(val, msg).to.be.most(atmst);
+  };
+
   /**
    * ### .isTrue(value, [message])
    *
diff --git a/test/assert.js b/test/assert.js
index 2bf985cfc..c59601203 100644
--- a/test/assert.js
+++ b/test/assert.js
@@ -726,6 +726,15 @@ describe('assert', function () {
     }, 'expected 1 to be above 1');
   });
 
+  it('atLeast', function() {
+    assert.isAtLeast(5, 2, '5 should be above 2');
+    assert.isAtLeast(1, 1, '1 should be equal to 1');
+
+    err(function() {
+      assert.isAtLeast(1, 3);
+    }, 'expected 1 to be at least 3');
+  });
+
   it('below', function() {
     assert.isBelow(2, 5, '2 should be below 5');
 
@@ -739,6 +748,15 @@ describe('assert', function () {
 
   });
 
+  it('atMost', function() {
+    assert.isAtMost(2, 5, '2 should be below 5');
+    assert.isAtMost(1, 1, '1 should be equal to 1');
+
+    err(function() {
+      assert.isAtMost(3, 1);
+    }, 'expected 3 to be at most 1');
+  });
+
   it('memberDeepEquals', function() {
     assert.sameDeepMembers([ {b: 3}, {a: 2}, {c: 5} ], [ {c: 5}, {b: 3}, {a: 2} ], 'same deep members');
     assert.sameDeepMembers([ {b: 3}, {a: 2}, 5, "hello" ], [ "hello", 5, {b: 3}, {a: 2} ], 'same deep members');