diff --git a/crates/fj-core/src/geometry/util.rs b/crates/fj-core/src/geometry/util.rs
index 6a4fdf330..35710d8cc 100644
--- a/crates/fj-core/src/geometry/util.rs
+++ b/crates/fj-core/src/geometry/util.rs
@@ -6,3 +6,22 @@
 //! Whatever's in here isn't expected to stay here permanently. Rather, this
 //! module provides an easy place to put new things, before it's clear what to
 //! do with them long-term.
+
+use fj_math::Point;
+
+use super::{traits::GenPolyline, Tolerance};
+
+/// # Convert a point on a curve from curve coordinates to surface coordinates
+pub fn curve_point_to_surface_point(
+    curve: &dyn GenPolyline<2>,
+    point_curve: impl Into<Point<1>>,
+    tolerance: impl Into<Tolerance>,
+) -> Point<2> {
+    let point_curve = point_curve.into();
+    let tolerance = tolerance.into();
+
+    let line_segment = curve.line_segment_at(point_curve, tolerance);
+    let line = line_segment.to_line();
+
+    line.point_from_line_coords(point_curve)
+}