diff --git a/OpenNest.IO/NestFormat.cs b/OpenNest.IO/NestFormat.cs
index 393fe00..6801a31 100644
--- a/OpenNest.IO/NestFormat.cs
+++ b/OpenNest.IO/NestFormat.cs
@@ -72,7 +72,7 @@ namespace OpenNest.IO
         public record SizeDto
         {
             public double Width { get; init; }
-            public double Height { get; init; }
+            public double Length { get; init; }
         }
 
         public record MaterialDto
diff --git a/OpenNest.IO/NestReader.cs b/OpenNest.IO/NestReader.cs
index a6b9745..5ce5715 100644
--- a/OpenNest.IO/NestReader.cs
+++ b/OpenNest.IO/NestReader.cs
@@ -113,7 +113,7 @@ namespace OpenNest.IO
 
             // Plate defaults
             var pd = dto.PlateDefaults;
-            nest.PlateDefaults.Size = new OpenNest.Geometry.Size(pd.Size.Width, pd.Size.Height);
+            nest.PlateDefaults.Size = new OpenNest.Geometry.Size(pd.Size.Width, pd.Size.Length);
             nest.PlateDefaults.Thickness = pd.Thickness;
             nest.PlateDefaults.Quadrant = pd.Quadrant;
             nest.PlateDefaults.PartSpacing = pd.PartSpacing;
@@ -128,7 +128,7 @@ namespace OpenNest.IO
             foreach (var p in dto.Plates.OrderBy(p => p.Id))
             {
                 var plate = new Plate();
-                plate.Size = new OpenNest.Geometry.Size(p.Size.Width, p.Size.Height);
+                plate.Size = new OpenNest.Geometry.Size(p.Size.Width, p.Size.Length);
                 plate.Thickness = p.Thickness;
                 plate.Quadrant = p.Quadrant;
                 plate.Quantity = p.Quantity;
diff --git a/OpenNest.IO/NestWriter.cs b/OpenNest.IO/NestWriter.cs
index e7d6de0..842f825 100644
--- a/OpenNest.IO/NestWriter.cs
+++ b/OpenNest.IO/NestWriter.cs
@@ -82,7 +82,7 @@ namespace OpenNest.IO
             var pd = nest.PlateDefaults;
             return new PlateDefaultsDto
             {
-                Size = new SizeDto { Width = pd.Size.Width, Height = pd.Size.Height },
+                Size = new SizeDto { Width = pd.Size.Width, Length = pd.Size.Height },
                 Thickness = pd.Thickness,
                 Quadrant = pd.Quadrant,
                 PartSpacing = pd.PartSpacing,
@@ -161,7 +161,7 @@ namespace OpenNest.IO
                 list.Add(new PlateDto
                 {
                     Id = i + 1,
-                    Size = new SizeDto { Width = plate.Size.Width, Height = plate.Size.Height },
+                    Size = new SizeDto { Width = plate.Size.Width, Length = plate.Size.Height },
                     Thickness = plate.Thickness,
                     Quadrant = plate.Quadrant,
                     Quantity = plate.Quantity,