diff --git a/pkg/volume/glusterfs/glusterfs.go b/pkg/volume/glusterfs/glusterfs.go
index 4f083e990e2..0ff53f3563b 100644
--- a/pkg/volume/glusterfs/glusterfs.go
+++ b/pkg/volume/glusterfs/glusterfs.go
@@ -695,7 +695,7 @@ func (p *glusterfsVolumeProvisioner) Provision() (*v1.PersistentVolume, error) {
 
 	glog.V(2).Infof("Allocated GID [%d] for PVC %s", gid, p.options.PVC.Name)
 
-	glusterfs, sizeGB, err := p.CreateVolume(gid)
+	glusterfs, sizeGiB, err := p.CreateVolume(gid)
 	if err != nil {
 		if releaseErr := gidTable.Release(gid); releaseErr != nil {
 			glog.Errorf("error when releasing GID in storageclass: %s", scName)
@@ -724,7 +724,7 @@ func (p *glusterfsVolumeProvisioner) Provision() (*v1.PersistentVolume, error) {
 	}
 
 	pv.Spec.Capacity = v1.ResourceList{
-		v1.ResourceName(v1.ResourceStorage): resource.MustParse(fmt.Sprintf("%dG", sizeGB)),
+		v1.ResourceName(v1.ResourceStorage): resource.MustParse(fmt.Sprintf("%dGi", sizeGiB)),
 	}
 	return pv, nil
 }
@@ -732,10 +732,9 @@ func (p *glusterfsVolumeProvisioner) Provision() (*v1.PersistentVolume, error) {
 func (p *glusterfsVolumeProvisioner) CreateVolume(gid int) (r *v1.GlusterfsVolumeSource, size int, err error) {
 	var clusterIDs []string
 	capacity := p.options.PVC.Spec.Resources.Requests[v1.ResourceName(v1.ResourceStorage)]
-	volSizeBytes := capacity.Value()
-	// Glusterfs creates volumes in units of GBs
-	sz := int(volume.RoundUpSize(volSizeBytes, 1000*1000*1000))
-	glog.V(2).Infof("create volume of size: %d bytes and configuration %+v", volSizeBytes, p.provisionerConfig)
+	// Glusterfs creates volumes in units of GiB, but heketi documentation incorrectly reports GBs
+	sz := int(volume.RoundUpToGiB(capacity))
+	glog.V(2).Infof("create volume of size: %d GiB and configuration %+v", sz, p.provisionerConfig)
 	if p.url == "" {
 		glog.Errorf("REST server endpoint is empty")
 		return nil, 0, fmt.Errorf("failed to create glusterfs REST client, REST URL is empty")
@@ -1077,10 +1076,10 @@ func (plugin *glusterfsPlugin) ExpandVolumeDevice(spec *volume.Spec, newSize res
 
 	// Find out delta size
 	expansionSize := (newSize.Value() - oldSize.Value())
-	expansionSizeGB := int(volume.RoundUpSize(expansionSize, 1000*1000*1000))
+	expansionSizeGiB := int(volume.RoundUpSize(expansionSize, volume.GIB))
 
 	// Make volume expansion request
-	volumeExpandReq := &gapi.VolumeExpandRequest{Size: expansionSizeGB}
+	volumeExpandReq := &gapi.VolumeExpandRequest{Size: expansionSizeGiB}
 
 	// Expand the volume
 	volumeInfoRes, err := cli.VolumeExpand(volumeID, volumeExpandReq)
@@ -1090,6 +1089,6 @@ func (plugin *glusterfsPlugin) ExpandVolumeDevice(spec *volume.Spec, newSize res
 	}
 
 	glog.V(2).Infof("volume %s expanded to new size %d successfully", volumeName, volumeInfoRes.Size)
-	newVolumeSize := resource.MustParse(fmt.Sprintf("%dG", volumeInfoRes.Size))
+	newVolumeSize := resource.MustParse(fmt.Sprintf("%dGi", volumeInfoRes.Size))
 	return newVolumeSize, nil
 }
diff --git a/pkg/volume/util.go b/pkg/volume/util.go
index e2890516980..3f71da1b862 100644
--- a/pkg/volume/util.go
+++ b/pkg/volume/util.go
@@ -38,6 +38,13 @@ import (
 	"k8s.io/apimachinery/pkg/util/sets"
 )
 
+const (
+	// GB - GigaByte size
+	GB = 1000 * 1000 * 1000
+	// GIB - GibiByte size
+	GIB = 1024 * 1024 * 1024
+)
+
 type RecycleEventRecorder func(eventtype, message string)
 
 // RecycleVolumeByWatchingPodUntilCompletion is intended for use with volume
@@ -288,6 +295,18 @@ func RoundUpSize(volumeSizeBytes int64, allocationUnitBytes int64) int64 {
 	return (volumeSizeBytes + allocationUnitBytes - 1) / allocationUnitBytes
 }
 
+// RoundUpToGB rounds up given quantity to chunks of GB
+func RoundUpToGB(size resource.Quantity) int64 {
+	requestBytes := size.Value()
+	return RoundUpSize(requestBytes, GB)
+}
+
+// RoundUpToGiB rounds up given quantity upto chunks of GiB
+func RoundUpToGiB(size resource.Quantity) int64 {
+	requestBytes := size.Value()
+	return RoundUpSize(requestBytes, GIB)
+}
+
 // GenerateVolumeName returns a PV name with clusterName prefix. The function
 // should be used to generate a name of GCE PD or Cinder volume. It basically
 // adds "<clusterName>-dynamic-" before the PV name, making sure the resulting