diff --git a/manual/src/builtins.md b/manual/src/builtins.md
index 543b69e5ca2929ffcd5d2f966bfbfa0c8e62e6da..289d4b075a877bd30e7d4924efd00fb5b051523f 100644
--- a/manual/src/builtins.md
+++ b/manual/src/builtins.md
@@ -20,11 +20,11 @@ DESCRIPTION
     Returns true if the value given to it is equal to '1' or 'true'.
 ```
 
-## calc - Floating-point calculator
+## math - Floating-point calculator
 
 ```txt
 SYNOPSIS
-    calc [EXPRESSION]
+    math [EXPRESSION]
 
 DESCRIPTION
     Evaluates arithmetic expressions
@@ -48,10 +48,10 @@ NOTATIONS
 
 EXAMPLES
     Add two plus two in infix notation
-        calc 2+2
+        math 2+2
 
     Add two plus two in polish notation
-        calc + 2 2
+        math + 2 2
 
 AUTHOR
     Written by Hunter Goldstein.
@@ -604,4 +604,4 @@ SYNOPSIS
 DESCRIPTION
     The which utility takes a list of command names and searches for the
     alias/builtin/function/executable that would be executed if you ran that command.
-```
\ No newline at end of file
+```
diff --git a/manual/src/expansions/04-arithmetic.md b/manual/src/expansions/04-arithmetic.md
index 50fd94f5971491ab6b04206bd82e956112fc582d..4dfbf90ad3fa1fc5fb1ca6091f30bdc255694843 100644
--- a/manual/src/expansions/04-arithmetic.md
+++ b/manual/src/expansions/04-arithmetic.md
@@ -2,7 +2,7 @@
 
 We've exported our arithmetic logic into a separate crate
 [calculate](https://crates.io/crates/calculate). We use this library for both our `calc` builtin,
-and for parsing arithmetic expansions. Use `calc` if you want a REPL for arithmetic, else use
+and for parsing arithmetic expansions. Use `math` if you want a REPL for arithmetic, else use
 arithmetic expansions (`$((a + b))`) if you want the result inlined. Variables may be passed into
 arithmetic expansions without the **$** sigil, as it is automatically inferred that text references
 string variables. Supported operators are as below:
diff --git a/src/lib/builtins/calc.rs b/src/lib/builtins/math.rs
similarity index 91%
rename from src/lib/builtins/calc.rs
rename to src/lib/builtins/math.rs
index bc11a9a4b447adac346cf70379c3d62b925367e9..7b9ec5957e3cbefa7fe07e665dd951a4629f44b6 100644
--- a/src/lib/builtins/calc.rs
+++ b/src/lib/builtins/math.rs
@@ -5,7 +5,7 @@ use calc::{eval, eval_polish, CalcError, Value};
 use liner::Context;
 use std::io::{self, Read};
 
-const REPL_GUIDE: &str = r#"ion-calc
+const REPL_GUIDE: &str = r#"Ion's integrated calculator
 Type in expressions to have them evaluated.
 Type "help" for help."#;
 
@@ -20,7 +20,7 @@ fn calc_or_polish_calc(args: &str) -> Result<Value, CalcError> {
     desc = "Floating-point calculator",
     man = "
 SYNOPSIS
-    calc [EXPRESSION]
+    math [EXPRESSION]
 
 DESCRIPTION
     Evaluates arithmetic expressions
@@ -44,15 +44,15 @@ NOTATIONS
 
 EXAMPLES
     Add two plus two in infix notation
-        calc 2+2
+        math 2+2
 
     Add two plus two in polish notation
-        calc + 2 2
+        math + 2 2
 
 AUTHOR
     Written by Hunter Goldstein."
 )]
-pub fn calc(args: &[crate::types::Str], _: &mut crate::Shell<'_>) -> Status {
+pub fn math(args: &[crate::types::Str], _: &mut crate::Shell<'_>) -> Status {
     if args.get(1).is_some() {
         let result = calc_or_polish_calc(&args[1..].join(" "));
         match result {
@@ -67,7 +67,7 @@ pub fn calc(args: &[crate::types::Str], _: &mut crate::Shell<'_>) -> Status {
         let mut context = Context::new();
         loop {
             match context
-                .read_line("ion-calc: ", None, &mut EmptyCompleter)
+                .read_line("ion-math: ", None, &mut EmptyCompleter)
                 .as_ref()
                 .map(AsRef::as_ref)
             {
diff --git a/src/lib/builtins/mod.rs b/src/lib/builtins/mod.rs
index a5d452f58a4e81f7b5a0ed8dd839187eb7d3634d..db3b22cfae29339af108234bc246bd0d25478429 100644
--- a/src/lib/builtins/mod.rs
+++ b/src/lib/builtins/mod.rs
@@ -1,7 +1,6 @@
 /// helpers for creating help
 pub mod man_pages;
 
-mod calc;
 mod command_info;
 mod conditionals;
 mod echo;
@@ -10,6 +9,7 @@ mod functions;
 mod helpers;
 mod is;
 mod job_control;
+mod math;
 mod random;
 mod set;
 mod source;
@@ -18,7 +18,6 @@ mod test;
 mod variables;
 
 pub use self::{
-    calc::builtin_calc,
     command_info::builtin_which,
     conditionals::{builtin_contains, builtin_ends_with, builtin_starts_with},
     echo::builtin_echo,
@@ -27,6 +26,7 @@ pub use self::{
     helpers::Status,
     is::builtin_is,
     man_pages::check_help,
+    math::builtin_math,
     set::builtin_set,
     source::builtin_source,
     status::builtin_status,
@@ -196,11 +196,11 @@ impl<'a> BuiltinMap<'a> {
 
     /// Utilities to test values
     ///
-    /// Contains `bool`, `calc`, `eq`, `is`, `true`, `false`, `starts-with`, `ends-with`,
+    /// Contains `bool`, `math`, `eq`, `is`, `true`, `false`, `starts-with`, `ends-with`,
     /// `contains`, `matches`, `random`
     pub fn with_values_tests(&mut self) -> &mut Self {
         self.add("bool", &builtin_bool, "If the value is '1' or 'true', return 0 exit status")
-            .add("calc", &builtin_calc, "Calculate a mathematical expression")
+            .add("math", &builtin_math, "Calculate a mathematical expression")
             .add("eq", &builtin_is, "Simple alternative to == and !=")
             .add("is", &builtin_is, "Simple alternative to == and !=")
             .add("true", &builtin_true_, "Do nothing, successfully")
diff --git a/src/lib/parser/pipelines.rs b/src/lib/parser/pipelines.rs
index 16572c4bd21912914201eb0099bde56e91f830af..8f24d92f26579a1a4ee610fd09d9ff1193a1c0a4 100644
--- a/src/lib/parser/pipelines.rs
+++ b/src/lib/parser/pipelines.rs
@@ -987,10 +987,10 @@ mod tests {
 
     #[test]
     fn herestring() {
-        let input = "calc <<< $(cat math.txt)";
+        let input = "math <<< $(cat math.txt)";
         let expected = Pipeline {
             items: vec![PipeItem {
-                job: Job::new(args!["calc"], RedirectFrom::None, None),
+                job: Job::new(args!["math"], RedirectFrom::None, None),
 
                 inputs:  vec![Input::HereString("$(cat math.txt)".into())],
                 outputs: vec![],
diff --git a/tests/fn.ion b/tests/fn.ion
index c4db566e58f6205fc05f460dc72fbff18e910e5c..da36a247147ce1ce996cca0c596fb3cbebac80fe 100644
--- a/tests/fn.ion
+++ b/tests/fn.ion
@@ -15,7 +15,7 @@ end
 another_test
 
 fn square n:int
-    calc $n \* $n
+    math $n \* $n
 end
 
 for num in 1 2 3 4 5 a 1.5