diff --git a/README.md b/README.md
index 10f2319c..b68ae81a 100644
--- a/README.md
+++ b/README.md
@@ -8,14 +8,14 @@
 
 Xiao is a Discord bot coded in JavaScript with
 [discord.js](https://discord.js.org/) using the
-[Commando](https://github.com/discordjs/Commando) command framework. With nearly
+[Commando](https://github.com/discordjs/Commando) command framework. With over
 300 commands, she is one of the most feature-filled bots out there.
 
 ## Invite
 The bot is no longer available for invite. You can self-host the bot, or use her
 on the [home server](https://discord.gg/sbMe32W).
 
-## Commands (300)
+## Commands (301)
 ### Utility:
 
 * **eval**: Executes JavaScript code.
@@ -331,6 +331,7 @@ on the [home server](https://discord.gg/sbMe32W).
 
 * **currency**: Converts money from one currency to another.
 * **final-grade-calculator**: Determines the grade you need to make on your final to get your desired course grade.
+* **gravity**: Determines weight on another planet.
 * **math**: Evaluates a math expression.
 * **roman-numeral**: Converts a number to roman numerals.
 * **scrabble-score**: Responds with the scrabble score of a word.
diff --git a/assets/json/gravity.json b/assets/json/gravity.json
new file mode 100644
index 00000000..518f9a97
--- /dev/null
+++ b/assets/json/gravity.json
@@ -0,0 +1,12 @@
+{
+	"mercury": 0.378,
+	"venus": 0.907,
+	"earth": 1,
+	"moon": 0.166,
+	"mars": 0.377,
+	"jupiter": 2.36,
+	"saturn": 0.916,
+	"uranus": 0.889,
+	"neptune": 1.12,
+	"pluto": 0.071
+}
diff --git a/commands/number-edit/gravity.js b/commands/number-edit/gravity.js
new file mode 100644
index 00000000..80970717
--- /dev/null
+++ b/commands/number-edit/gravity.js
@@ -0,0 +1,33 @@
+const Command = require('../../structures/Command');
+const { list, firstUpperCase } = require('../../util/Util');
+const planets = require('../../assets/json/gravity');
+
+module.exports = class GravityCommand extends Command {
+	constructor(client) {
+		super(client, {
+			name: 'gravity',
+			group: 'number-edit',
+			memberName: 'gravity',
+			description: 'Determines weight on another planet.',
+			details: `**Planets**: ${Object.keys(planets).join(', ')}`,
+			args: [
+				{
+					key: 'weight',
+					prompt: 'What should the starting weight be (in KG)?',
+					type: 'float'
+				},
+				{
+					key: 'planet',
+					prompt: `What planet do you want to use as the base? Either ${list(Object.keys(planets), 'or')}.`,
+					type: 'string',
+					oneOf: planets,
+					parse: planet => planet.toUpperCase()
+				}
+			]
+		});
+	}
+
+	run(msg, { weight, planet }) {
+		return msg.say(`${weight} kg on ${firstUpperCase(planet)} is ${weight * planets[planet]} kg.`);
+	}
+};
diff --git a/commands/number-edit/roman-numeral.js b/commands/number-edit/roman-numeral.js
index c8ad007b..4a0749cb 100644
--- a/commands/number-edit/roman-numeral.js
+++ b/commands/number-edit/roman-numeral.js
@@ -22,7 +22,7 @@ module.exports = class RomanNumeralCommand extends Command {
 	}
 
 	run(msg, { number }) {
-		if (number === 0) return msg.say('_nulla_');
+		if (number === 0) return msg.reply('_nulla_');
 		let result = '';
 		for (const [numeral, value] of Object.entries(numerals)) {
 			while (number >= value) {
@@ -30,6 +30,6 @@ module.exports = class RomanNumeralCommand extends Command {
 				number -= value;
 			}
 		}
-		return msg.say(result);
+		return msg.reply(result);
 	}
 };
diff --git a/package.json b/package.json
index 39aebd76..3d744727 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
 	"name": "xiao",
-	"version": "90.2.1",
+	"version": "90.3.0",
 	"description": "Your personal server companion.",
 	"main": "Xiao.js",
 	"scripts": {
diff --git a/util/Util.js b/util/Util.js
index c96446b7..3ea53c4d 100644
--- a/util/Util.js
+++ b/util/Util.js
@@ -48,6 +48,10 @@ module.exports = class Util {
 		return arr;
 	}
 
+	static firstUpperCase(text) {
+		return `${text.charAt(0).toUpperCase()}${text.slice(1)}`;
+	}
+
 	static base64(text, mode = 'encode') {
 		if (mode === 'encode') return Buffer.from(text).toString('base64');
 		if (mode === 'decode') return Buffer.from(text, 'base64').toString('utf8') || null;