diff --git a/crates/ruff/resources/test/fixtures/pyupgrade/UP032_2.py b/crates/ruff/resources/test/fixtures/pyupgrade/UP032_2.py
new file mode 100644
index 0000000000..e6d567c7cd
--- /dev/null
+++ b/crates/ruff/resources/test/fixtures/pyupgrade/UP032_2.py
@@ -0,0 +1,16 @@
+# Errors
+"{.real}".format(1)
+"{0.real}".format(1)
+"{a.real}".format(a=1)
+
+"{.real}".format(1.0)
+"{0.real}".format(1.0)
+"{a.real}".format(a=1.0)
+
+"{.real}".format(1j)
+"{0.real}".format(1j)
+"{a.real}".format(a=1j)
+
+"{.real}".format(0b01)
+"{0.real}".format(0b01)
+"{a.real}".format(a=0b01)
diff --git a/crates/ruff/src/rules/pyupgrade/mod.rs b/crates/ruff/src/rules/pyupgrade/mod.rs
index 22c30c7e7b..9a5c07dc59 100644
--- a/crates/ruff/src/rules/pyupgrade/mod.rs
+++ b/crates/ruff/src/rules/pyupgrade/mod.rs
@@ -59,6 +59,7 @@ mod tests {
     #[test_case(Rule::PrintfStringFormatting, Path::new("UP031_1.py"); "UP031_1")]
     #[test_case(Rule::FString, Path::new("UP032_0.py"); "UP032_0")]
     #[test_case(Rule::FString, Path::new("UP032_1.py"); "UP032_1")]
+    #[test_case(Rule::FString, Path::new("UP032_2.py"); "UP032_2")]
     #[test_case(Rule::LRUCacheWithMaxsizeNone, Path::new("UP033_0.py"); "UP033_0")]
     #[test_case(Rule::LRUCacheWithMaxsizeNone, Path::new("UP033_1.py"); "UP033_1")]
     #[test_case(Rule::ExtraneousParentheses, Path::new("UP034.py"); "UP034")]
diff --git a/crates/ruff/src/rules/pyupgrade/rules/f_strings.rs b/crates/ruff/src/rules/pyupgrade/rules/f_strings.rs
index e21bbf0869..3ed11820e8 100644
--- a/crates/ruff/src/rules/pyupgrade/rules/f_strings.rs
+++ b/crates/ruff/src/rules/pyupgrade/rules/f_strings.rs
@@ -171,24 +171,37 @@ fn try_convert_to_f_string(checker: &Checker, expr: &Expr) -> Option<String> {
                 converted.push('{');
 
                 let field = FieldName::parse(&field_name).ok()?;
+                let has_field_parts = !field.parts.is_empty();
                 match field.field_type {
                     FieldType::Auto => {
                         let Some(arg) = summary.consume_next() else {
                             return None;
                         };
-                        converted.push_str(&arg);
+                        if has_field_parts && arg.chars().all(|c| c.is_ascii_digit()) {
+                            converted.push_str(&format!("({arg})"));
+                        } else {
+                            converted.push_str(&arg);
+                        }
                     }
                     FieldType::Index(index) => {
                         let Some(arg) = summary.consume_arg(index) else {
                             return None;
                         };
-                        converted.push_str(&arg);
+                        if has_field_parts && arg.chars().all(|c| c.is_ascii_digit()) {
+                            converted.push_str(&format!("({arg})"));
+                        } else {
+                            converted.push_str(&arg);
+                        }
                     }
                     FieldType::Keyword(name) => {
                         let Some(arg) = summary.consume_kwarg(&name) else {
                             return None;
                         };
-                        converted.push_str(&arg);
+                        if has_field_parts && arg.chars().all(|c| c.is_ascii_digit()) {
+                            converted.push_str(&format!("({arg})"));
+                        } else {
+                            converted.push_str(&arg);
+                        }
                     }
                 }
 
diff --git a/crates/ruff/src/rules/pyupgrade/snapshots/ruff__rules__pyupgrade__tests__UP032_2.py.snap b/crates/ruff/src/rules/pyupgrade/snapshots/ruff__rules__pyupgrade__tests__UP032_2.py.snap
new file mode 100644
index 0000000000..1905bcd70b
--- /dev/null
+++ b/crates/ruff/src/rules/pyupgrade/snapshots/ruff__rules__pyupgrade__tests__UP032_2.py.snap
@@ -0,0 +1,237 @@
+---
+source: crates/ruff/src/rules/pyupgrade/mod.rs
+---
+UP032_2.py:2:1: UP032 [*] Use f-string instead of `format` call
+  |
+2 | # Errors
+3 | "{.real}".format(1)
+  | ^^^^^^^^^^^^^^^^^^^ UP032
+4 | "{0.real}".format(1)
+5 | "{a.real}".format(a=1)
+  |
+  = help: Convert to f-string
+
+ℹ Suggested fix
+1 1 | # Errors
+2   |-"{.real}".format(1)
+  2 |+f"{(1).real}"
+3 3 | "{0.real}".format(1)
+4 4 | "{a.real}".format(a=1)
+5 5 | 
+
+UP032_2.py:3:1: UP032 [*] Use f-string instead of `format` call
+  |
+3 | # Errors
+4 | "{.real}".format(1)
+5 | "{0.real}".format(1)
+  | ^^^^^^^^^^^^^^^^^^^^ UP032
+6 | "{a.real}".format(a=1)
+  |
+  = help: Convert to f-string
+
+ℹ Suggested fix
+1 1 | # Errors
+2 2 | "{.real}".format(1)
+3   |-"{0.real}".format(1)
+  3 |+f"{(1).real}"
+4 4 | "{a.real}".format(a=1)
+5 5 | 
+6 6 | "{.real}".format(1.0)
+
+UP032_2.py:4:1: UP032 [*] Use f-string instead of `format` call
+  |
+4 | "{.real}".format(1)
+5 | "{0.real}".format(1)
+6 | "{a.real}".format(a=1)
+  | ^^^^^^^^^^^^^^^^^^^^^^ UP032
+7 | 
+8 | "{.real}".format(1.0)
+  |
+  = help: Convert to f-string
+
+ℹ Suggested fix
+1 1 | # Errors
+2 2 | "{.real}".format(1)
+3 3 | "{0.real}".format(1)
+4   |-"{a.real}".format(a=1)
+  4 |+f"{(1).real}"
+5 5 | 
+6 6 | "{.real}".format(1.0)
+7 7 | "{0.real}".format(1.0)
+
+UP032_2.py:6:1: UP032 [*] Use f-string instead of `format` call
+   |
+ 6 | "{a.real}".format(a=1)
+ 7 | 
+ 8 | "{.real}".format(1.0)
+   | ^^^^^^^^^^^^^^^^^^^^^ UP032
+ 9 | "{0.real}".format(1.0)
+10 | "{a.real}".format(a=1.0)
+   |
+   = help: Convert to f-string
+
+ℹ Suggested fix
+3 3 | "{0.real}".format(1)
+4 4 | "{a.real}".format(a=1)
+5 5 | 
+6   |-"{.real}".format(1.0)
+  6 |+f"{1.0.real}"
+7 7 | "{0.real}".format(1.0)
+8 8 | "{a.real}".format(a=1.0)
+9 9 | 
+
+UP032_2.py:7:1: UP032 [*] Use f-string instead of `format` call
+  |
+7 | "{.real}".format(1.0)
+8 | "{0.real}".format(1.0)
+  | ^^^^^^^^^^^^^^^^^^^^^^ UP032
+9 | "{a.real}".format(a=1.0)
+  |
+  = help: Convert to f-string
+
+ℹ Suggested fix
+4 4 | "{a.real}".format(a=1)
+5 5 | 
+6 6 | "{.real}".format(1.0)
+7   |-"{0.real}".format(1.0)
+  7 |+f"{1.0.real}"
+8 8 | "{a.real}".format(a=1.0)
+9 9 | 
+10 10 | "{.real}".format(1j)
+
+UP032_2.py:8:1: UP032 [*] Use f-string instead of `format` call
+   |
+ 8 | "{.real}".format(1.0)
+ 9 | "{0.real}".format(1.0)
+10 | "{a.real}".format(a=1.0)
+   | ^^^^^^^^^^^^^^^^^^^^^^^^ UP032
+11 | 
+12 | "{.real}".format(1j)
+   |
+   = help: Convert to f-string
+
+ℹ Suggested fix
+5 5 | 
+6 6 | "{.real}".format(1.0)
+7 7 | "{0.real}".format(1.0)
+8   |-"{a.real}".format(a=1.0)
+  8 |+f"{1.0.real}"
+9 9 | 
+10 10 | "{.real}".format(1j)
+11 11 | "{0.real}".format(1j)
+
+UP032_2.py:10:1: UP032 [*] Use f-string instead of `format` call
+   |
+10 | "{a.real}".format(a=1.0)
+11 | 
+12 | "{.real}".format(1j)
+   | ^^^^^^^^^^^^^^^^^^^^ UP032
+13 | "{0.real}".format(1j)
+14 | "{a.real}".format(a=1j)
+   |
+   = help: Convert to f-string
+
+ℹ Suggested fix
+7  7  | "{0.real}".format(1.0)
+8  8  | "{a.real}".format(a=1.0)
+9  9  | 
+10    |-"{.real}".format(1j)
+   10 |+f"{1j.real}"
+11 11 | "{0.real}".format(1j)
+12 12 | "{a.real}".format(a=1j)
+13 13 | 
+
+UP032_2.py:11:1: UP032 [*] Use f-string instead of `format` call
+   |
+11 | "{.real}".format(1j)
+12 | "{0.real}".format(1j)
+   | ^^^^^^^^^^^^^^^^^^^^^ UP032
+13 | "{a.real}".format(a=1j)
+   |
+   = help: Convert to f-string
+
+ℹ Suggested fix
+8  8  | "{a.real}".format(a=1.0)
+9  9  | 
+10 10 | "{.real}".format(1j)
+11    |-"{0.real}".format(1j)
+   11 |+f"{1j.real}"
+12 12 | "{a.real}".format(a=1j)
+13 13 | 
+14 14 | "{.real}".format(0b01)
+
+UP032_2.py:12:1: UP032 [*] Use f-string instead of `format` call
+   |
+12 | "{.real}".format(1j)
+13 | "{0.real}".format(1j)
+14 | "{a.real}".format(a=1j)
+   | ^^^^^^^^^^^^^^^^^^^^^^^ UP032
+15 | 
+16 | "{.real}".format(0b01)
+   |
+   = help: Convert to f-string
+
+ℹ Suggested fix
+9  9  | 
+10 10 | "{.real}".format(1j)
+11 11 | "{0.real}".format(1j)
+12    |-"{a.real}".format(a=1j)
+   12 |+f"{1j.real}"
+13 13 | 
+14 14 | "{.real}".format(0b01)
+15 15 | "{0.real}".format(0b01)
+
+UP032_2.py:14:1: UP032 [*] Use f-string instead of `format` call
+   |
+14 | "{a.real}".format(a=1j)
+15 | 
+16 | "{.real}".format(0b01)
+   | ^^^^^^^^^^^^^^^^^^^^^^ UP032
+17 | "{0.real}".format(0b01)
+18 | "{a.real}".format(a=0b01)
+   |
+   = help: Convert to f-string
+
+ℹ Suggested fix
+11 11 | "{0.real}".format(1j)
+12 12 | "{a.real}".format(a=1j)
+13 13 | 
+14    |-"{.real}".format(0b01)
+   14 |+f"{0b01.real}"
+15 15 | "{0.real}".format(0b01)
+16 16 | "{a.real}".format(a=0b01)
+
+UP032_2.py:15:1: UP032 [*] Use f-string instead of `format` call
+   |
+15 | "{.real}".format(0b01)
+16 | "{0.real}".format(0b01)
+   | ^^^^^^^^^^^^^^^^^^^^^^^ UP032
+17 | "{a.real}".format(a=0b01)
+   |
+   = help: Convert to f-string
+
+ℹ Suggested fix
+12 12 | "{a.real}".format(a=1j)
+13 13 | 
+14 14 | "{.real}".format(0b01)
+15    |-"{0.real}".format(0b01)
+   15 |+f"{0b01.real}"
+16 16 | "{a.real}".format(a=0b01)
+
+UP032_2.py:16:1: UP032 [*] Use f-string instead of `format` call
+   |
+16 | "{.real}".format(0b01)
+17 | "{0.real}".format(0b01)
+18 | "{a.real}".format(a=0b01)
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^ UP032
+   |
+   = help: Convert to f-string
+
+ℹ Suggested fix
+13 13 | 
+14 14 | "{.real}".format(0b01)
+15 15 | "{0.real}".format(0b01)
+16    |-"{a.real}".format(a=0b01)
+   16 |+f"{0b01.real}"
+
+