diff --git a/.changelog/20543.txt b/.changelog/20543.txt
new file mode 100644
index 000000000..f77da2c23
--- /dev/null
+++ b/.changelog/20543.txt
@@ -0,0 +1,3 @@
+```release-note:bug
+client: Fix unallocated CPU metric calculation when client reserved CPU is set
+```
diff --git a/client/client.go b/client/client.go
index 88df8d7d9..b6d9d4833 100644
--- a/client/client.go
+++ b/client/client.go
@@ -3252,7 +3252,11 @@ func (c *Client) setGaugeForAllocationStats(nodeID string, baseLabels []metrics.
 	// Emit unallocated
 	unallocatedMem := total.Memory.MemoryMB - res.Memory.MemoryMB - allocated.Flattened.Memory.MemoryMB
 	unallocatedDisk := total.Disk.DiskMB - res.Disk.DiskMB - allocated.Shared.DiskMB
-	unallocatedCpu := int64(total.Processors.Topology.UsableCompute()) - res.Cpu.CpuShares - allocated.Flattened.Cpu.CpuShares
+
+	// The UsableCompute function call already subtracts and accounts for any
+	// reserved CPU within the client configuration. Therefore, we do not need
+	// to subtract that here.
+	unallocatedCpu := int64(total.Processors.Topology.UsableCompute()) - allocated.Flattened.Cpu.CpuShares
 
 	metrics.SetGaugeWithLabels([]string{"client", "unallocated", "memory"}, float32(unallocatedMem), baseLabels)
 	metrics.SetGaugeWithLabels([]string{"client", "unallocated", "disk"}, float32(unallocatedDisk), baseLabels)