diff --git a/Cargo.lock b/Cargo.lock
index d24ff9e..e7d3b91 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -179,6 +179,9 @@ dependencies = [
 [[package]]
 name = "day_1"
 version = "0.1.0"
+dependencies = [
+ "criterion",
+]
 
 [[package]]
 name = "day_10"
diff --git a/day_1/Cargo.toml b/day_1/Cargo.toml
index 849e3ec..612c06f 100644
--- a/day_1/Cargo.toml
+++ b/day_1/Cargo.toml
@@ -7,3 +7,9 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+[dev-dependencies]
+criterion = "0.3"
+
+[[bench]]
+name = "day_1"
+harness = false
diff --git a/day_1/benches/day_1.rs b/day_1/benches/day_1.rs
new file mode 100644
index 0000000..1e6acfc
--- /dev/null
+++ b/day_1/benches/day_1.rs
@@ -0,0 +1,19 @@
+use criterion::{criterion_group, criterion_main, Criterion};
+use day_1::day_1::{input, part_1, part_2};
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let input = input();
+    c.bench_function("day 1 part 1", |b| {
+        b.iter(|| {
+            part_1(&input);
+        })
+    });
+    c.bench_function("day 1 part 2", |b| {
+        b.iter(|| {
+            part_2(&input);
+        })
+    });
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);