diff --git a/crates/js/src/formcalc.rs b/crates/js/src/formcalc.rs
index 4b955ef9f3..2348ce2206 100644
--- a/crates/js/src/formcalc.rs
+++ b/crates/js/src/formcalc.rs
@@ -2522,10 +2522,10 @@ impl Interp<'_> {
                 let v = parse_num(&s).unwrap_or(0.0);
                 let unit: String = s.trim().chars().skip_while(|c| c.is_ascii_digit() || *c == '.' || *c == '-' || *c == '+').collect();
                 let per_in = |u: &str| match u.trim().to_ascii_lowercase().as_str() {
-                    "mm" => 25.4,
-                    "cm" => 2.54,
-                    "pt" => 72.0,
-                    "pc" => 6.0,
+                    "mm" | "millimeter" | "millimeters" => 25.4,
+                    "cm" | "centimeter" | "centimeters" => 2.54,
+                    "pt" | "point" | "points" => 72.0,
+                    "pc" | "pica" => 6.0,
                     _ => 1.0,
                 };
                 let target = if to.trim().is_empty() { unit.clone() } else { to };
diff --git a/crates/js/src/tests.rs b/crates/js/src/tests.rs
index 01a4362400..7d63b49981 100644
--- a/crates/js/src/tests.rs
+++ b/crates/js/src/tests.rs
@@ -990,6 +990,9 @@ mod formcalc {
         assert_eq!(calc("Round(PV(100, 0.01, 12), 2)"), "1125.51");
         assert_eq!(calc(r#"UnitValue("2in", "mm")"#), "50.8");
         assert_eq!(calc(r#"UnitType("2.5cm")"#), "cm");
+        assert_eq!(calc(r#"UnitValue("72points", "in")"#), "1");
+        assert_eq!(calc(r#"UnitValue("25.4millimeters", "inches")"#), "1");
+        assert_eq!(calc(r#"UnitValue("1in", "points")"#), "72");
         assert_eq!(calc(r#"Encode("a b&c", "url")"#), "a%20b%26c");
         assert_eq!(calc(r#"Decode("a%20b", "url")"#), "a b");
         assert!(go(r#"Get("http://example.com")"#, "form1[0].page1[0].total[0]", "calculate").error.unwrap().contains("network"));