diff --git a/.eslintrc b/.eslintrc
index 7fc8f5ecf8..30c2dddcff 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -15,6 +15,7 @@
         "no-underscore-dangle": "off",
         "newline-per-chained-call": "off",
         "no-console": "off",
+        "no-mixed-operators": ["error", { "allowSamePrecedence": true }],
 
         // ES6
         "prefer-rest-params": "off",
@@ -99,7 +100,7 @@
         "no-multi-spaces": "off",
         "quotes": "off",
         "keyword-spacing": "off",
-        "no-mixed-operators": "off",
+        // "no-mixed-operators": "off",
         // "comma-spacing": "off",
         // "no-trailing-spaces": "off",
         // "key-spacing": "off",
diff --git a/loader.js b/loader.js
index bcfad1b52c..a8e1bf712e 100644
--- a/loader.js
+++ b/loader.js
@@ -60,7 +60,7 @@ Loader.addWorkerEvents = function (worker) {
 					Loader.timesStarted = 0;
 				}, 10000);
 			} else {
-				console.log(numProcs * 3 + ' restarts in 10 seconds, most likely an error on startup. Halting.');
+				console.log((numProcs * 3) + ' restarts in 10 seconds, most likely an error on startup. Halting.');
 				process.exit();
 			}
 		}
diff --git a/public/src/admin/admin.js b/public/src/admin/admin.js
index d492f7d831..45211d9934 100644
--- a/public/src/admin/admin.js
+++ b/public/src/admin/admin.js
@@ -216,7 +216,7 @@
 
 		function onOpeningMenu() {
 			$('#header').css({
-				top: $('#panel').position().top * -1 + 'px',
+				top: ($('#panel').position().top * -1) + 'px',
 				position: 'absolute',
 			});
 		}
diff --git a/public/src/admin/manage/users.js b/public/src/admin/manage/users.js
index 5e3dddf19a..34cd2476cd 100644
--- a/public/src/admin/manage/users.js
+++ b/public/src/admin/manage/users.js
@@ -99,7 +99,7 @@ define('admin/manage/users', ['translator'], function (translator) {
 									data[cur.name] = cur.value;
 									return data;
 								}, {});
-								var until = formData.length ? (Date.now() + formData.length * 1000 * 60 * 60 * (parseInt(formData.unit, 10) ? 24 : 1)) : 0;
+								var until = formData.length ? (Date.now() + (formData.length * 1000 * 60 * 60 * (parseInt(formData.unit, 10) ? 24 : 1))) : 0;
 								socket.emit('user.banUsers', { uids: uids, until: until, reason: formData.reason }, done('[[admin/manage/users:alerts.ban-success]]', '.ban', true));
 							},
 						},
diff --git a/public/src/client/account/header.js b/public/src/client/account/header.js
index 9e453e8203..33756e5b6c 100644
--- a/public/src/client/account/header.js
+++ b/public/src/client/account/header.js
@@ -129,7 +129,7 @@ define('forum/account/header', [
 								data[cur.name] = cur.value;
 								return data;
 							}, {});
-							var until = parseInt(formData.length, 10) ? (Date.now() + formData.length * 1000 * 60 * 60 * (parseInt(formData.unit, 10) ? 24 : 1)) : 0;
+							var until = parseInt(formData.length, 10) ? (Date.now() + (formData.length * 1000 * 60 * 60 * (parseInt(formData.unit, 10) ? 24 : 1))) : 0;
 
 							socket.emit('user.banUsers', { uids: [ajaxify.data.theirid], until: until, reason: formData.reason || '' }, function (err) {
 								if (err) {
diff --git a/public/src/client/chats.js b/public/src/client/chats.js
index d05e9d2e99..82a4354c39 100644
--- a/public/src/client/chats.js
+++ b/public/src/client/chats.js
@@ -355,7 +355,7 @@ define('forum/chats', [
 
 			messagesList.height($(window).height() - (fromTop + inputHeight + (margin * 4)));
 			components.get('chat/recent').height($('.expanded-chat').height() - (searchHeight + searchListHeight));
-			$('[component="chat/search/list"]').css('max-height', components.get('chat/recent').height() / 2 + 'px');
+			$('[component="chat/search/list"]').css('max-height', (components.get('chat/recent').height() / 2) + 'px');
 		}
 
 		Chats.setActive();
diff --git a/public/src/modules/chat.js b/public/src/modules/chat.js
index f2e15c57b5..e5d82ba4aa 100644
--- a/public/src/modules/chat.js
+++ b/public/src/modules/chat.js
@@ -298,7 +298,7 @@ define('chat', [
 			hideAfter = true;
 		}
 		chatModal.css('left', Math.max(0, (($(window).width() - $(chatModal).outerWidth()) / 2) + $(window).scrollLeft()) + 'px');
-		chatModal.css('top', Math.max(0, $(window).height() / 2 - $(chatModal).outerHeight() / 2) + 'px');
+		chatModal.css('top', Math.max(0, ($(window).height() / 2) - ($(chatModal).outerHeight() / 2)) + 'px');
 
 		if (hideAfter) {
 			chatModal.addClass('hide');
diff --git a/public/src/modules/navigator.js b/public/src/modules/navigator.js
index b6f7480027..62d5bbb788 100644
--- a/public/src/modules/navigator.js
+++ b/public/src/modules/navigator.js
@@ -114,7 +114,7 @@ define('navigator', ['forum/pagination', 'components'], function (pagination, co
 		var scrollTop = $(window).scrollTop();
 		var windowHeight = $(window).height();
 		var documentHeight = $(document).height();
-		var middleOfViewport = scrollTop + windowHeight / 2;
+		var middleOfViewport = scrollTop + (windowHeight / 2);
 		var previousDistance = Number.MAX_VALUE;
 		els.each(function () {
 			var distanceToMiddle = Math.abs(middleOfViewport - $(this).offset().top);
diff --git a/public/src/modules/settings.js b/public/src/modules/settings.js
index cc10a7cdf4..cb733b970a 100644
--- a/public/src/modules/settings.js
+++ b/public/src/modules/settings.js
@@ -171,7 +171,7 @@ define('settings', function () {
 				if (trim && value != null && typeof value.trim === 'function') {
 					value = value.trim();
 				}
-				if (empty || value !== void 0 && (value == null || value.length !== 0)) {
+				if (empty || (value !== void 0 && (value == null || value.length !== 0))) {
 					return value;
 				} else {
 					return void 0;
diff --git a/public/src/modules/settings/array.js b/public/src/modules/settings/array.js
index 6957b85bc7..368574f68e 100644
--- a/public/src/modules/settings/array.js
+++ b/public/src/modules/settings/array.js
@@ -130,7 +130,7 @@ define('settings/array', function () {
 				child = $(child);
 				var val = helper.readValue(child);
 				var empty = helper.isTrue(child.data('empty'));
-				if (empty || val !== void 0 && (val == null || val.length !== 0)) {
+				if (empty || (val !== void 0 && (val == null || val.length !== 0))) {
 					return values.push(val);
 				}
 			});
diff --git a/public/src/modules/settings/object.js b/public/src/modules/settings/object.js
index 11166607e7..8bf7e8400b 100644
--- a/public/src/modules/settings/object.js
+++ b/public/src/modules/settings/object.js
@@ -102,7 +102,7 @@ define('settings/object', function () {
 				var val = helper.readValue(property);
 				var prop = property.data('prop');
 				var empty = helper.isTrue(property.data('empty'));
-				if (empty || val !== void 0 && (val == null || val.length !== 0)) {
+				if (empty || (val !== void 0 && (val == null || val.length !== 0))) {
 					return value[prop] = val;
 				}
 			});
diff --git a/public/src/utils.js b/public/src/utils.js
index 93b67dff5c..c80d530b13 100644
--- a/public/src/utils.js
+++ b/public/src/utils.js
@@ -15,7 +15,7 @@
 
 		process.elapsedTimeSince = function (start) {
 			var diff = process.hrtime(start);
-			return diff[0] * 1e3 + diff[1] / 1e6;
+			return (diff[0] * 1e3) + (diff[1] / 1e6);
 		};
 
 	} else {
@@ -27,7 +27,7 @@
 		generateUUID: function () {
 			return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {
 				var r = Math.random() * 16 | 0;
-				var v = c === 'x' ? r : (r & 0x3 | 0x8);
+				var v = c === 'x' ? r : ((r & 0x3) | 0x8);
 				return v.toString(16);
 			});
 		},
diff --git a/src/controllers/category.js b/src/controllers/category.js
index 70e167b9c7..218c7c3144 100644
--- a/src/controllers/category.js
+++ b/src/controllers/category.js
@@ -87,7 +87,7 @@ categoryController.get = function (req, res, callback) {
 				set = 'cid:' + cid + ':tids:posts';
 			}
 
-			var start = (currentPage - 1) * settings.topicsPerPage + topicIndex;
+			var start = ((currentPage - 1) * settings.topicsPerPage) + topicIndex;
 			var stop = start + settings.topicsPerPage - 1;
 
 			var payload = {
diff --git a/src/controllers/topics.js b/src/controllers/topics.js
index 4b5ef83245..12082fa32e 100644
--- a/src/controllers/topics.js
+++ b/src/controllers/topics.js
@@ -113,7 +113,7 @@ topicsController.get = function (req, res, callback) {
 				currentPage = Math.max(1, Math.ceil(index / settings.postsPerPage));
 			}
 
-			var start = (currentPage - 1) * settings.postsPerPage + postIndex;
+			var start = ((currentPage - 1) * settings.postsPerPage) + postIndex;
 			var stop = start + settings.postsPerPage - 1;
 
 			topics.getTopicWithPosts(results.topic, set, req.uid, start, stop, reverse, next);
diff --git a/src/image.js b/src/image.js
index 54777d6c79..82d8886895 100644
--- a/src/image.js
+++ b/src/image.js
@@ -42,7 +42,7 @@ image.resizeImage = function (data, callback) {
 					crop = async.apply(image.crop.bind(image), x, y, h * desiredRatio, h);
 				} else {
 					x = 0;	// width is the smaller dimension here
-					y = Math.floor(h / 2 - (w * desiredRatio / 2));
+					y = Math.floor((h / 2) - (w * desiredRatio / 2));
 					crop = async.apply(image.crop.bind(image), x, y, w, w * desiredRatio);
 				}
 			} else {
diff --git a/src/middleware/render.js b/src/middleware/render.js
index 8d2c96a4ee..3f565353a1 100644
--- a/src/middleware/render.js
+++ b/src/middleware/render.js
@@ -107,7 +107,7 @@ module.exports = function (middleware) {
 	}
 
 	function translate(str, req, res, next) {
-		var language = res.locals.config && res.locals.config.userLang || 'en-GB';
+		var language = (res.locals.config && res.locals.config.userLang) || 'en-GB';
 		language = req.query.lang ? validator.escape(String(req.query.lang)) : language;
 		translator.translate(str, language, function (translated) {
 			next(null, translator.unescape(translated));
diff --git a/src/posts/votes.js b/src/posts/votes.js
index 61ba87b919..d069f0f57a 100644
--- a/src/posts/votes.js
+++ b/src/posts/votes.js
@@ -162,7 +162,7 @@ module.exports = function (Posts) {
 			var hook;
 			var current = voteStatus.upvoted ? 'upvote' : 'downvote';
 
-			if (voteStatus.upvoted && command === 'downvote' || voteStatus.downvoted && command === 'upvote') {	// e.g. User *has* upvoted, and clicks downvote
+			if ((voteStatus.upvoted && command === 'downvote') || (voteStatus.downvoted && command === 'upvote')) {	// e.g. User *has* upvoted, and clicks downvote
 				hook = command;
 			} else if (voteStatus.upvoted || voteStatus.downvoted) {	// e.g. User *has* upvoted, clicks upvote (so we "unvote")
 				hook = 'unvote';
diff --git a/src/privileges/users.js b/src/privileges/users.js
index 94426d154c..5dd26f5189 100644
--- a/src/privileges/users.js
+++ b/src/privileges/users.js
@@ -128,7 +128,7 @@ module.exports = function (privileges) {
 			if (err) {
 				return callback(err);
 			}
-			if (Array.isArray(uid) && !Array.isArray(data.isModerator) || Array.isArray(cid) && !Array.isArray(data.isModerator)) {
+			if ((Array.isArray(uid) || Array.isArray(cid)) && !Array.isArray(data.isModerator)) {
 				return callback(new Error('filter:user.isModerator - i/o mismatch'));
 			}
 
diff --git a/src/topics/unread.js b/src/topics/unread.js
index e76ee22fda..17c5b701e0 100644
--- a/src/topics/unread.js
+++ b/src/topics/unread.js
@@ -64,7 +64,8 @@ module.exports = function (Topics) {
 	};
 
 	Topics.unreadCutoff = function () {
-		return Date.now() - (parseInt(meta.config.unreadCutoff, 10) || 2) * 86400000;
+		var cutoff = parseInt(meta.config.unreadCutoff, 10) || 2;
+		return Date.now() - (cutoff * 86400000);
 	};
 
 	Topics.getUnreadTids = function (cid, uid, filter, callback) {
diff --git a/src/user/email.js b/src/user/email.js
index 05a3db8719..2e51da951a 100644
--- a/src/user/email.js
+++ b/src/user/email.js
@@ -57,7 +57,7 @@ var emailer = require('../emailer');
 				}, next);
 			},
 			function (next) {
-				db.expireAt('confirm:' + confirm_code, Math.floor(Date.now() / 1000 + 60 * 60 * 24), next);
+				db.expireAt('confirm:' + confirm_code, Math.floor((Date.now() / 1000) + (60 * 60 * 24)), next);
 			},
 			function (next) {
 				user.getUserField(uid, 'username', next);
diff --git a/src/user/reset.js b/src/user/reset.js
index 9b3732c13e..90aa9f072e 100644
--- a/src/user/reset.js
+++ b/src/user/reset.js
@@ -48,7 +48,7 @@ var emailer = require('../emailer');
 				db.sortedSetScore('reset:issueDate:uid', uid, next);
 			},
 			function (score, next) {
-				if (score > Date.now() - 1000 * 60) {
+				if (score > Date.now() - (1000 * 60)) {
 					return next(new Error('[[error:cant-reset-password-more-than-once-a-minute]]'));
 				}
 				next();
diff --git a/src/user/search.js b/src/user/search.js
index ee20b48c39..95e5b6ed29 100644
--- a/src/user/search.js
+++ b/src/user/search.js
@@ -156,7 +156,7 @@ module.exports = function (User) {
 			},
 			function (users, next) {
 				var diff = process.hrtime(start);
-				var timing = (diff[0] * 1e3 + diff[1] / 1e6).toFixed(1);
+				var timing = ((diff[0] * 1e3) + (diff[1] / 1e6)).toFixed(1);
 				next(null, {timing: timing, users: users});
 			},
 		], callback);