diff --git a/PkmnLib.Dynamic/Libraries/DynamicLibrary.cs b/PkmnLib.Dynamic/Libraries/DynamicLibrary.cs
index 9fb0cc7..b59c513 100644
--- a/PkmnLib.Dynamic/Libraries/DynamicLibrary.cs
+++ b/PkmnLib.Dynamic/Libraries/DynamicLibrary.cs
@@ -39,6 +39,12 @@ public interface IDynamicLibrary
     /// </summary>
     ICaptureLibrary CaptureLibrary { get; }
 
+    /// <summary>
+    /// The experience gain calculator deals with the calculation of experience gained by a
+    /// Pokémon after defeating another Pokémon.
+    /// </summary>
+    IExperienceGainCalculator ExperienceGainCalculator { get; }
+
     /// <summary>
     /// A holder of the script types that can be resolved by this library.
     /// </summary>
@@ -64,12 +70,13 @@ public class DynamicLibraryImpl : IDynamicLibrary
 
         return new DynamicLibraryImpl(load.StaticLibrary, load.Registry.BattleStatCalculator!,
             load.Registry.DamageCalculator!, load.Registry.MiscLibrary!, load.Registry.CaptureLibrary!, load.Resolver,
-            load.Registry.ExplicitAIHandlers);
+            load.Registry.ExplicitAIHandlers, load.Registry.ExperienceGainCalculator!);
     }
 
     private DynamicLibraryImpl(IStaticLibrary staticLibrary, IBattleStatCalculator statCalculator,
         IDamageCalculator damageCalculator, IMiscLibrary miscLibrary, ICaptureLibrary captureLibrary,
-        ScriptResolver scriptResolver, IReadOnlyExplicitAIHandlers explicitAIHandlers)
+        ScriptResolver scriptResolver, IReadOnlyExplicitAIHandlers explicitAIHandlers,
+        IExperienceGainCalculator experienceGainCalculator)
     {
         StaticLibrary = staticLibrary;
         StatCalculator = statCalculator;
@@ -77,6 +84,7 @@ public class DynamicLibraryImpl : IDynamicLibrary
         MiscLibrary = miscLibrary;
         ScriptResolver = scriptResolver;
         ExplicitAIHandlers = explicitAIHandlers;
+        ExperienceGainCalculator = experienceGainCalculator;
         CaptureLibrary = captureLibrary;
     }
 
@@ -95,6 +103,9 @@ public class DynamicLibraryImpl : IDynamicLibrary
     /// <inheritdoc />
     public ICaptureLibrary CaptureLibrary { get; }
 
+    /// <inheritdoc />
+    public IExperienceGainCalculator ExperienceGainCalculator { get; }
+
     /// <inheritdoc />
     public ScriptResolver ScriptResolver { get; }
 
diff --git a/PkmnLib.Dynamic/Libraries/ExperienceGainCalculator.cs b/PkmnLib.Dynamic/Libraries/ExperienceGainCalculator.cs
new file mode 100644
index 0000000..2fc1d37
--- /dev/null
+++ b/PkmnLib.Dynamic/Libraries/ExperienceGainCalculator.cs
@@ -0,0 +1,14 @@
+using PkmnLib.Dynamic.Models;
+
+namespace PkmnLib.Dynamic.Libraries;
+
+/// <summary>
+/// Calculates experience gain for Pokémon battles.
+/// </summary>
+public interface IExperienceGainCalculator
+{
+    /// <summary>
+    /// Calculates the experience a Pokémon gains when defeating another Pokémon.
+    /// </summary>
+    uint CalculateExperienceGain(IPokemon defeatedPokemon, IPokemon victoriousPokemon);
+}
\ No newline at end of file
diff --git a/PkmnLib.Dynamic/Libraries/LibraryLoader.cs b/PkmnLib.Dynamic/Libraries/LibraryLoader.cs
index 26ef872..3401efe 100644
--- a/PkmnLib.Dynamic/Libraries/LibraryLoader.cs
+++ b/PkmnLib.Dynamic/Libraries/LibraryLoader.cs
@@ -36,6 +36,8 @@ public static class LibraryLoader
             throw new InvalidOperationException("Misc library not found in plugins.");
         if (registry.CaptureLibrary is null)
             throw new InvalidOperationException("Capture library not found in plugins.");
+        if (registry.ExperienceGainCalculator is null)
+            throw new InvalidOperationException("Experience gain calculator not found in plugins.");
         var scriptResolver = new ScriptResolver(registry.ScriptTypes, registry.ItemScriptTypes);
         return new LoadResult(registry, scriptResolver, staticLibrary);
     }
diff --git a/PkmnLib.Dynamic/Models/Pokemon.cs b/PkmnLib.Dynamic/Models/Pokemon.cs
index dad5d5e..a819330 100644
--- a/PkmnLib.Dynamic/Models/Pokemon.cs
+++ b/PkmnLib.Dynamic/Models/Pokemon.cs
@@ -1184,6 +1184,11 @@ public class PokemonImpl : ScriptSource, IPokemon
         BattleData.BattleSide.MarkFaint(BattleData.Position);
         BattleData.BattleSide.ForceClearPokemonFromField(BattleData.Position);
 
+        foreach (var opponent in BattleData.SeenOpponents.WhereNotNull())
+        {
+            opponent.AddExperience(Library.ExperienceGainCalculator.CalculateExperienceGain(this, opponent));
+        }
+
         // Validate the battle state to see if the battle is over.
         BattleData.Battle.ValidateBattleState();
     }
diff --git a/PkmnLib.Dynamic/ScriptHandling/Registry/ScriptRegistry.cs b/PkmnLib.Dynamic/ScriptHandling/Registry/ScriptRegistry.cs
index 756ac62..0a90089 100644
--- a/PkmnLib.Dynamic/ScriptHandling/Registry/ScriptRegistry.cs
+++ b/PkmnLib.Dynamic/ScriptHandling/Registry/ScriptRegistry.cs
@@ -19,6 +19,7 @@ public class ScriptRegistry
     private IDamageCalculator? _damageCalculator;
     private IMiscLibrary? _miscLibrary;
     private ICaptureLibrary? _captureLibrary;
+    private IExperienceGainCalculator? _experienceGainCalculator;
 
     /// <summary>
     /// Automatically register all scripts in the given assembly that have the <see cref="ScriptAttribute"/>, and
@@ -110,11 +111,18 @@ public class ScriptRegistry
     public void RegisterCaptureLibrary<T>(T captureLibrary) where T : ICaptureLibrary =>
         _captureLibrary = captureLibrary;
 
+    /// <summary>
+    /// Register an experience gain calculator.
+    /// </summary>
+    public void RegisterExperienceGainCalculator<T>(T experienceGainCalculator) where T : IExperienceGainCalculator =>
+        _experienceGainCalculator = experienceGainCalculator;
+
     internal IReadOnlyDictionary<(ScriptCategory category, StringKey name), Func<Script>> ScriptTypes => _scriptTypes;
     internal IReadOnlyDictionary<StringKey, Func<IItem, ItemScript>> ItemScriptTypes => _itemScriptTypes;
     internal IBattleStatCalculator? BattleStatCalculator => _battleStatCalculator;
     internal IDamageCalculator? DamageCalculator => _damageCalculator;
     internal IMiscLibrary? MiscLibrary => _miscLibrary;
     internal ICaptureLibrary? CaptureLibrary => _captureLibrary;
+    internal IExperienceGainCalculator? ExperienceGainCalculator => _experienceGainCalculator;
     public ExplicitAIHandlers ExplicitAIHandlers { get; } = new();
 }
\ No newline at end of file
diff --git a/Plugins/PkmnLib.Plugin.Gen7/Gen7Plugin.cs b/Plugins/PkmnLib.Plugin.Gen7/Gen7Plugin.cs
index 335262b..a5314af 100644
--- a/Plugins/PkmnLib.Plugin.Gen7/Gen7Plugin.cs
+++ b/Plugins/PkmnLib.Plugin.Gen7/Gen7Plugin.cs
@@ -49,6 +49,7 @@ public class Gen7Plugin : Plugin<Gen7PluginConfiguration>, IResourceProvider
         registry.RegisterDamageCalculator(new Gen7DamageCalculator(Configuration));
         registry.RegisterMiscLibrary(new Gen7MiscLibrary());
         registry.RegisterCaptureLibrary(new Gen7CaptureLibrary(Configuration));
+        registry.RegisterExperienceGainCalculator(new Gen7ExperienceGainCalculator());
 
         ExplicitAIFunctionRegistration.RegisterAIFunctions(registry.ExplicitAIHandlers);
     }
diff --git a/Plugins/PkmnLib.Plugin.Gen7/Libraries/Battling/Gen7ExperienceGainCalculator.cs b/Plugins/PkmnLib.Plugin.Gen7/Libraries/Battling/Gen7ExperienceGainCalculator.cs
new file mode 100644
index 0000000..fe9b9e5
--- /dev/null
+++ b/Plugins/PkmnLib.Plugin.Gen7/Libraries/Battling/Gen7ExperienceGainCalculator.cs
@@ -0,0 +1,40 @@
+using System.Diagnostics.CodeAnalysis;
+using PkmnLib.Dynamic.Libraries;
+
+namespace PkmnLib.Plugin.Gen7.Libraries.Battling;
+
+/// <inheritdoc />
+public class Gen7ExperienceGainCalculator : IExperienceGainCalculator
+{
+    /// <inheritdoc />
+    [SuppressMessage("ReSharper", "UselessBinaryOperation")]
+    public uint CalculateExperienceGain(IPokemon defeatedPokemon, IPokemon victoriousPokemon)
+    {
+        var b = defeatedPokemon.Form.BaseExperience;
+        var levelFainted = defeatedPokemon.Level;
+        var levelOpponent = victoriousPokemon.Level;
+        // TODO: Experience share, in which case s = 2 for Pokemon that did not participate in battle
+        var s = 1;
+
+        var v1 = b * levelFainted / 5 * (1 / s);
+        var v2 = (2 * levelFainted + 10) / (levelFainted + levelOpponent + 10);
+        var res = v1 * Math.Pow(v2, 2.5) + 1;
+
+        // TODO: t = 1.5 if the Pokemon is traded, and 1.7 is traded and has a different language
+        var t = 1;
+        res *= t;
+        // TODO: script modifier, which is e.
+        var e = 1;
+        res *= e;
+        // TODO: v = 1.2 if the Pokemon is at or past the level where it evolves
+        var v = 1;
+        res *= v;
+
+        return res switch
+        {
+            > uint.MaxValue => uint.MaxValue,
+            < 0 => 0,
+            _ => (uint)res,
+        };
+    }
+}
\ No newline at end of file