diff --git a/2024/Cargo.lock b/2024/Cargo.lock
index 2b9599c..e6976cb 100644
--- a/2024/Cargo.lock
+++ b/2024/Cargo.lock
@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "addr2line"
@@ -143,6 +143,21 @@ dependencies = [
  "tracing-subscriber",
 ]
 
+[[package]]
+name = "day-03"
+version = "0.1.0"
+dependencies = [
+ "divan",
+ "itertools",
+ "miette",
+ "nom",
+ "regex",
+ "rstest",
+ "test-log",
+ "tracing",
+ "tracing-subscriber",
+]
+
 [[package]]
 name = "divan"
 version = "0.1.16"
diff --git a/2024/day-03/Cargo.toml b/2024/day-03/Cargo.toml
new file mode 100644
index 0000000..70017cc
--- /dev/null
+++ b/2024/day-03/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "day-03"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+itertools.workspace = true
+nom.workspace = true
+tracing.workspace = true
+tracing-subscriber.workspace = true
+miette.workspace = true
+regex = "1.11"
+
+[dev-dependencies]
+divan.workspace = true
+rstest.workspace = true
+test-log.workspace = true
+
+[[bench]]
+name = "day-03-bench"
+path = "benches/benchmarks.rs"
+harness = false
diff --git a/2024/day-03/benches/benchmarks.rs b/2024/day-03/benches/benchmarks.rs
new file mode 100644
index 0000000..a883666
--- /dev/null
+++ b/2024/day-03/benches/benchmarks.rs
@@ -0,0 +1,21 @@
+use day_03::*;
+
+fn main() {
+    divan::main();
+}
+
+#[divan::bench]
+fn part1() {
+    part1::process(divan::black_box(include_str!(
+        "../input1.txt",
+    )))
+    .unwrap();
+}
+
+#[divan::bench]
+fn part2() {
+    part2::process(divan::black_box(include_str!(
+        "../input2.txt",
+    )))
+    .unwrap();
+}
diff --git a/2024/day-03/src/bin/part1.rs b/2024/day-03/src/bin/part1.rs
new file mode 100644
index 0000000..715099f
--- /dev/null
+++ b/2024/day-03/src/bin/part1.rs
@@ -0,0 +1,12 @@
+use day_03::part1::process;
+use miette::{Context, Result};
+
+#[tracing::instrument]
+fn main() -> Result<()> {
+    tracing_subscriber::fmt::init();
+
+    let file = include_str!("../../input1.txt");
+    let result = process(file).context("process part 1")?;
+    println!("{}", result);
+    Ok(())
+}
diff --git a/2024/day-03/src/bin/part2.rs b/2024/day-03/src/bin/part2.rs
new file mode 100644
index 0000000..f519877
--- /dev/null
+++ b/2024/day-03/src/bin/part2.rs
@@ -0,0 +1,12 @@
+use day_03::part2::process;
+use miette::{Context, Result};
+
+#[tracing::instrument]
+fn main() -> Result<()> {
+    tracing_subscriber::fmt::init();
+
+    let file = include_str!("../../input2.txt");
+    let result = process(file).context("process part 2")?;
+    println!("{}", result);
+    Ok(())
+}
diff --git a/2024/day-03/src/lib.rs b/2024/day-03/src/lib.rs
new file mode 100644
index 0000000..faaf542
--- /dev/null
+++ b/2024/day-03/src/lib.rs
@@ -0,0 +1,2 @@
+pub mod part1;
+pub mod part2;
diff --git a/2024/day-03/src/part1.rs b/2024/day-03/src/part1.rs
new file mode 100644
index 0000000..6f70fa2
--- /dev/null
+++ b/2024/day-03/src/part1.rs
@@ -0,0 +1,62 @@
+use std::num::ParseIntError;
+
+use miette::Result;
+use regex::Regex;
+
+#[derive(Debug)]
+struct Multiplication(usize, usize);
+
+impl Multiplication {
+    fn calculate(&self) -> usize {
+        self.0 * self.1
+    }
+}
+
+impl<T, U> TryFrom<(T, U)> for Multiplication
+where
+    T: Into<String>,
+    U: Into<String>,
+{
+    type Error = ParseIntError;
+    fn try_from(value: (T, U)) -> std::result::Result<Self, Self::Error> {
+        Ok(Self(
+            value.0.into().parse::<usize>()?,
+            value.1.into().parse::<usize>()?,
+        ))
+    }
+}
+
+fn extract_multiplications<'a>(
+    line: &'a str,
+    re: &'a Regex,
+) -> impl Iterator<Item = Multiplication> + 'a {
+    re.captures_iter(line).filter_map(|caps| {
+        let first = caps.get(1)?.as_str().to_owned();
+        let second = caps.get(2)?.as_str().to_owned();
+        Multiplication::try_from((first, second)).ok()
+    })
+}
+
+#[tracing::instrument]
+pub fn process(input: &str) -> Result<usize> {
+    let re = Regex::new(r"mul\((\d{1,3}),(\d{1,3})\)").unwrap();
+    let result = input
+        .lines()
+        .flat_map(|line| extract_multiplications(line, &re))
+        .map(|mult| mult.calculate())
+        .sum();
+    Ok(result)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_process() -> Result<()> {
+        let input = "xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))";
+        let result = 161;
+        assert_eq!(process(input)?, result);
+        Ok(())
+    }
+}
diff --git a/2024/day-03/src/part2.rs b/2024/day-03/src/part2.rs
new file mode 100644
index 0000000..cbcdee4
--- /dev/null
+++ b/2024/day-03/src/part2.rs
@@ -0,0 +1,21 @@
+use miette::Result;
+
+#[tracing::instrument]
+pub fn process(input: &str) -> Result<usize> {
+    todo!("day xx - part 2");
+    Ok(0)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_process() -> Result<()> {
+        let input = "";
+        todo!("haven't built test yet");
+        let result = 0;
+        assert_eq!(process(input)?, result);
+        Ok(())
+    }
+}