diff --git a/src/ImageSharp/Formats/Png/Chunks/PngPhysicalChunkData.cs b/src/ImageSharp/Formats/Png/Chunks/PngPhysicalChunkData.cs
new file mode 100644
index 0000000000..39a9676b63
--- /dev/null
+++ b/src/ImageSharp/Formats/Png/Chunks/PngPhysicalChunkData.cs
@@ -0,0 +1,93 @@
+using System;
+using System.Buffers.Binary;
+using SixLabors.ImageSharp.Common.Helpers;
+using SixLabors.ImageSharp.MetaData;
+
+namespace SixLabors.ImageSharp.Formats.Png
+{
+    /// <summary>
+    /// The pHYs chunk specifies the intended pixel size or aspect ratio for display of the image.
+    /// </summary>
+    internal readonly struct PngPhysicalChunkData
+    {
+        public const int Size = 9;
+
+        public PngPhysicalChunkData(uint x, uint y, byte unitSpecifier)
+        {
+            this.XAxisPixelsPerUnit = x;
+            this.YAxisPixelsPerUnit = y;
+            this.UnitSpecifier = unitSpecifier;
+        }
+
+        /// <summary>
+        /// Gets the number of pixels per unit on the X axis.
+        /// </summary>
+        public uint XAxisPixelsPerUnit { get; }
+
+        /// <summary>
+        /// Gets the number of pixels per unit on the Y axis.
+        /// </summary>
+        public uint YAxisPixelsPerUnit { get; }
+
+        /// <summary>
+        /// Gets the unit specifier.
+        /// 0: unit is unknown
+        /// 1: unit is the meter
+        /// When the unit specifier is 0, the pHYs chunk defines pixel aspect ratio only; the actual size of the pixels remains unspecified.
+        /// </summary>
+        public byte UnitSpecifier { get; }
+
+        /// <summary>
+        /// Constructs the PngPhysicalChunkData from the provided metadata.
+        /// If the resolution units are not in meters, they are automatically convereted.
+        /// </summary>
+        /// <param name="meta">The metadata.</param>
+        /// <returns>The constructed PngPhysicalChunkData instance.</returns>
+        public static PngPhysicalChunkData FromMetadata(ImageMetaData meta)
+        {
+            byte unitSpecifier = 0;
+            uint x;
+            uint y;
+
+            switch (meta.ResolutionUnits)
+            {
+                case PixelResolutionUnit.AspectRatio:
+                    unitSpecifier = 0; // Unspecified
+                    x = (uint)Math.Round(meta.HorizontalResolution);
+                    y = (uint)Math.Round(meta.VerticalResolution);
+                    break;
+
+                case PixelResolutionUnit.PixelsPerInch:
+                    unitSpecifier = 1; // Per meter
+                    x = (uint)Math.Round(UnitConverter.InchToMeter(meta.HorizontalResolution));
+                    y = (uint)Math.Round(UnitConverter.InchToMeter(meta.VerticalResolution));
+                    break;
+
+                case PixelResolutionUnit.PixelsPerCentimeter:
+                    unitSpecifier = 1; // Per meter
+                    x = (uint)Math.Round(UnitConverter.CmToMeter(meta.HorizontalResolution));
+                    y = (uint)Math.Round(UnitConverter.CmToMeter(meta.VerticalResolution));
+                    break;
+
+                default:
+                    unitSpecifier = 1; // Per meter
+                    x = (uint)Math.Round(meta.HorizontalResolution);
+                    y = (uint)Math.Round(meta.VerticalResolution);
+                    break;
+            }
+
+            return new PngPhysicalChunkData(x, y, unitSpecifier);
+        }
+
+        /// <summary>
+        /// Writes the data to the given buffer.
+        /// </summary>
+        /// <param name="buffer">The buffer.</param>
+        public void WriteTo(Span<byte> buffer)
+        {
+            BinaryPrimitives.WriteUInt32BigEndian(buffer.Slice(0, 4), this.XAxisPixelsPerUnit);
+            BinaryPrimitives.WriteUInt32BigEndian(buffer.Slice(4, 4), this.YAxisPixelsPerUnit);
+            buffer[8] = this.UnitSpecifier;
+        }
+    }
+}
diff --git a/src/ImageSharp/Formats/Png/PngEncoderCore.cs b/src/ImageSharp/Formats/Png/PngEncoderCore.cs
index 525cc8bd1c..7f3c9945ad 100644
--- a/src/ImageSharp/Formats/Png/PngEncoderCore.cs
+++ b/src/ImageSharp/Formats/Png/PngEncoderCore.cs
@@ -674,47 +674,9 @@ namespace SixLabors.ImageSharp.Formats.Png
         /// <param name="meta">The image meta data.</param>
         private void WritePhysicalChunk(Stream stream, ImageMetaData meta)
         {
-            // The pHYs chunk specifies the intended pixel size or aspect ratio for display of the image. It contains:
-            // Pixels per unit, X axis: 4 bytes (unsigned integer)
-            // Pixels per unit, Y axis: 4 bytes (unsigned integer)
-            // Unit specifier:          1 byte
-            //
-            // The following values are legal for the unit specifier:
-            //   0: unit is unknown
-            //   1: unit is the meter
-            //
-            // When the unit specifier is 0, the pHYs chunk defines pixel aspect ratio only; the actual size of the pixels remains unspecified.
-            Span<byte> hResolution = this.chunkDataBuffer.AsSpan(0, 4);
-            Span<byte> vResolution = this.chunkDataBuffer.AsSpan(4, 4);
-
-            switch (meta.ResolutionUnits)
-            {
-                case PixelResolutionUnit.AspectRatio:
-                    this.chunkDataBuffer[8] = 0;
-                    BinaryPrimitives.WriteInt32BigEndian(hResolution, (int)Math.Round(meta.HorizontalResolution));
-                    BinaryPrimitives.WriteInt32BigEndian(vResolution, (int)Math.Round(meta.VerticalResolution));
-                    break;
-
-                case PixelResolutionUnit.PixelsPerInch:
-                    this.chunkDataBuffer[8] = 1; // Per meter
-                    BinaryPrimitives.WriteInt32BigEndian(hResolution, (int)Math.Round(UnitConverter.InchToMeter(meta.HorizontalResolution)));
-                    BinaryPrimitives.WriteInt32BigEndian(vResolution, (int)Math.Round(UnitConverter.InchToMeter(meta.VerticalResolution)));
-                    break;
-
-                case PixelResolutionUnit.PixelsPerCentimeter:
-                    this.chunkDataBuffer[8] = 1; // Per meter
-                    BinaryPrimitives.WriteInt32BigEndian(hResolution, (int)Math.Round(UnitConverter.CmToMeter(meta.HorizontalResolution)));
-                    BinaryPrimitives.WriteInt32BigEndian(vResolution, (int)Math.Round(UnitConverter.CmToMeter(meta.VerticalResolution)));
-                    break;
-
-                default:
-                    this.chunkDataBuffer[8] = 1; // Per meter
-                    BinaryPrimitives.WriteInt32BigEndian(hResolution, (int)Math.Round(meta.HorizontalResolution));
-                    BinaryPrimitives.WriteInt32BigEndian(vResolution, (int)Math.Round(meta.VerticalResolution));
-                    break;
-            }
+            PngPhysicalChunkData.FromMetadata(meta).WriteTo(this.chunkDataBuffer);
 
-            this.WriteChunk(stream, PngChunkType.Physical, this.chunkDataBuffer, 0, 9);
+            this.WriteChunk(stream, PngChunkType.Physical, this.chunkDataBuffer, 0, PngPhysicalChunkData.Size);
         }
 
         /// <summary>