diff --git a/httpgo.go b/httpgo.go
index 5f90d95..f736ab2 100644
--- a/httpgo.go
+++ b/httpgo.go
@@ -66,10 +66,10 @@ func genRecords(size string) ([]Record, error) {
 		return nil, err
 	}
 	if suffix == "MB" {
-		total *= 1024
+		total *= 1000
 	}
-	if suffix == "BB" {
-		total *= 1024 * 1024
+	if suffix == "GB" {
+		total *= 1000 * 1000
 	}
 	records = genNRecords(total)
 	return records, nil