diff --git a/CHANGELOG.md b/CHANGELOG.md
index d33332a..aa9e740 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,8 +3,10 @@
 ## Unreleased
 
 * [#7] - Add `strtoul` and `strcpy`
+* [#8] - Add `abs`
 
 [#7]: https://github.com/rust-embedded-community/tinyrlibc/pull/7
+[#8]: https://github.com/rust-embedded-community/tinyrlibc/pull/8
 
 ## v0.2.2 (2022-03-17)
 
diff --git a/README.md b/README.md
index b59d57c..e834105 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ This crate basically came about so that the [nrfxlib](https://github.com/NordicP
 
 ## Implemented so far
 
+* abs
 * strol
 * atoi
 * strcmp
diff --git a/src/abs.rs b/src/abs.rs
new file mode 100644
index 0000000..c6d257b
--- /dev/null
+++ b/src/abs.rs
@@ -0,0 +1,36 @@
+//! Rust implementation of C library function `abs`
+//!
+//! Licensed under the Blue Oak Model Licence 1.0.0
+
+use crate::CInt;
+
+/// Calculates the integer absolute value
+///
+/// ```
+/// use tinyrlibc::abs;
+/// assert_eq!(abs(-2), 2);
+/// ```
+#[no_mangle]
+pub extern "C" fn abs(i: CInt) -> CInt {
+	i.abs()
+}
+
+#[cfg(test)]
+mod test {
+	use super::*;
+
+	#[test]
+	fn neg() {
+		assert_eq!(abs(-2), 2);
+	}
+
+	#[test]
+	fn pos() {
+		assert_eq!(abs(3), 3);
+	}
+
+	#[test]
+	fn zero() {
+		assert_eq!(abs(0), 0);
+	}
+}
diff --git a/src/lib.rs b/src/lib.rs
index 9cda140..3f0346e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -13,6 +13,9 @@
 #[allow(unused_imports)]
 use std as core;
 
+mod abs;
+pub use self::abs::abs;
+
 mod strcmp;
 pub use self::strcmp::strcmp;