diff --git a/decor/size_type.go b/decor/size_type.go
index a450c6c..57c09d9 100644
--- a/decor/size_type.go
+++ b/decor/size_type.go
@@ -9,7 +9,7 @@
 )
 
 const (
-	_ib   SizeB1024 = iota
+	_ib   SizeB1024 = iota + 1
 	_iKiB SizeB1024 = 1 << (iota * 10)
 	_iMiB
 	_iGiB
@@ -33,25 +33,22 @@
 		}
 	}
 
-	var b strings.Builder
 	var unit SizeB1024
 	switch {
 	case self < _iKiB:
 		unit = _ib
-		b.WriteString(strconv.FormatFloat(float64(self), 'f', prec, 64))
 	case self < _iMiB:
 		unit = _iKiB
-		b.WriteString(strconv.FormatFloat(float64(self)/float64(_iKiB), 'f', prec, 64))
 	case self < _iGiB:
 		unit = _iMiB
-		b.WriteString(strconv.FormatFloat(float64(self)/float64(_iMiB), 'f', prec, 64))
 	case self < _iTiB:
 		unit = _iGiB
-		b.WriteString(strconv.FormatFloat(float64(self)/float64(_iGiB), 'f', prec, 64))
 	case self <= math.MaxInt64:
 		unit = _iTiB
-		b.WriteString(strconv.FormatFloat(float64(self)/float64(_iTiB), 'f', prec, 64))
 	}
+
+	var b strings.Builder
+	b.WriteString(strconv.FormatFloat(float64(self)/float64(unit), 'f', prec, 64))
 
 	if st.Flag(' ') {
 		b.WriteString(" ")
@@ -76,7 +73,7 @@
 }
 
 const (
-	_b  SizeB1000 = 0
+	_b  SizeB1000 = 1
 	_KB SizeB1000 = 1000
 	_MB SizeB1000 = _KB * 1000
 	_GB SizeB1000 = _MB * 1000
@@ -100,25 +97,22 @@
 		}
 	}
 
-	var b strings.Builder
 	var unit SizeB1000
 	switch {
 	case self < _KB:
 		unit = _b
-		b.WriteString(strconv.FormatFloat(float64(self), 'f', prec, 64))
 	case self < _MB:
 		unit = _KB
-		b.WriteString(strconv.FormatFloat(float64(self)/float64(_KB), 'f', prec, 64))
 	case self < _GB:
 		unit = _MB
-		b.WriteString(strconv.FormatFloat(float64(self)/float64(_MB), 'f', prec, 64))
 	case self < _TB:
 		unit = _GB
-		b.WriteString(strconv.FormatFloat(float64(self)/float64(_GB), 'f', prec, 64))
 	case self <= math.MaxInt64:
 		unit = _TB
-		b.WriteString(strconv.FormatFloat(float64(self)/float64(_TB), 'f', prec, 64))
 	}
+
+	var b strings.Builder
+	b.WriteString(strconv.FormatFloat(float64(self)/float64(unit), 'f', prec, 64))
 
 	if st.Flag(' ') {
 		b.WriteString(" ")
diff --git a/decor/sizeb1000_string.go b/decor/sizeb1000_string.go
index 0207a57..3f32ef7 100644
--- a/decor/sizeb1000_string.go
+++ b/decor/sizeb1000_string.go
@@ -8,7 +8,7 @@
 	// An "invalid array index" compiler error signifies that the constant values have changed.
 	// Re-run the stringer command to generate them again.
 	var x [1]struct{}
-	_ = x[_b-0]
+	_ = x[_b-1]
 	_ = x[_KB-1000]
 	_ = x[_MB-1000000]
 	_ = x[_GB-1000000000]
@@ -25,7 +25,7 @@
 
 func (i SizeB1000) String() string {
 	switch {
-	case i == 0:
+	case i == 1:
 		return _SizeB1000_name_0
 	case i == 1000:
 		return _SizeB1000_name_1
diff --git a/decor/sizeb1024_string.go b/decor/sizeb1024_string.go
index 8538236..9fca66c 100644
--- a/decor/sizeb1024_string.go
+++ b/decor/sizeb1024_string.go
@@ -8,7 +8,7 @@
 	// An "invalid array index" compiler error signifies that the constant values have changed.
 	// Re-run the stringer command to generate them again.
 	var x [1]struct{}
-	_ = x[_ib-0]
+	_ = x[_ib-1]
 	_ = x[_iKiB-1024]
 	_ = x[_iMiB-1048576]
 	_ = x[_iGiB-1073741824]
@@ -25,7 +25,7 @@
 
 func (i SizeB1024) String() string {
 	switch {
-	case i == 0:
+	case i == 1:
 		return _SizeB1024_name_0
 	case i == 1024:
 		return _SizeB1024_name_1