Precise Computation of CLR Object Size

Precise Computation of CLR Object Size

This article determines the length of an object’s instance and a CLR object as well as differences between 32-bit and 64-bit systems for memory allocation

I think many developers have been wondering: How many bytes does an object instance take in managed code? What’s the limit for a CLR object? Are there any differences between 32-bit and 64-bit systems for memory allocation?


First, let’s recap, there are 2 kinds of objects in .NET: value types and reference types that are created on the stack and in the heap (managed by GC), respectively. Value types are intended for storing plain data, like integers or characters. Every field in a value type object is being copied during the variable assignment. Also, the life-cycle of such objects depends on the usage scope. Default sizes of value types are defined in Common Type System:

.net .net c# clr

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