diff --git a/src/parse.rs b/src/parse.rs
index 8ca2c3a..119a420 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -124,9 +124,22 @@ fn parse_unit(input: String) -> Result<NonMetric, ParseError> {
 		"in^2" =>  Ok(NonMetric::SquareInch),
 		"\"^2" =>  Ok(NonMetric::SquareInch),
 
+		"square foot" => Ok(NonMetric::SquareFoot),
+		"square feet" => Ok(NonMetric::SquareFoot),
+		"square ft" => Ok(NonMetric::SquareFoot),
+		"sq foot" => Ok(NonMetric::SquareFoot),
+		"sq feet" => Ok(NonMetric::SquareFoot),
+		"sq ft" => Ok(NonMetric::SquareFoot),
 		"foot²" => Ok(NonMetric::SquareFoot),
 		"feet²" => Ok(NonMetric::SquareFoot),
 		"ft²" => Ok(NonMetric::SquareFoot),
+		"'²" => Ok(NonMetric::SquareFoot),
+		"′²" => Ok(NonMetric::SquareFoot),
+		"foot^2" => Ok(NonMetric::SquareFoot),
+		"feet^2" => Ok(NonMetric::SquareFoot),
+		"ft^2" => Ok(NonMetric::SquareFoot),
+		"'^2" => Ok(NonMetric::SquareFoot),
+		"sf" => Ok(NonMetric::SquareFoot),
 
 		"acre" => Ok(NonMetric::Acre),
 		"acres" => Ok(NonMetric::Acre),
@@ -309,9 +322,22 @@ mod test {
 		assert_eq!(parse_unit("in^2".to_string()), Ok(NonMetric::SquareInch));
 		assert_eq!(parse_unit("\"^2".to_string()), Ok(NonMetric::SquareInch));
 
+		assert_eq!(parse_unit("square foot".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("square feet".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("square ft".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("sq foot".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("sq feet".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("sq ft".to_string()), Ok(NonMetric::SquareFoot));
 		assert_eq!(parse_unit("foot²".to_string()), Ok(NonMetric::SquareFoot));
 		assert_eq!(parse_unit("feet²".to_string()), Ok(NonMetric::SquareFoot));
 		assert_eq!(parse_unit("ft²".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("'²".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("′²".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("foot^2".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("feet^2".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("ft^2".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("'^2".to_string()), Ok(NonMetric::SquareFoot));
+		assert_eq!(parse_unit("sf".to_string()), Ok(NonMetric::SquareFoot));
 
 		assert_eq!(parse_unit("acre".to_string()), Ok(NonMetric::Acre));
 		assert_eq!(parse_unit("acres".to_string()), Ok(NonMetric::Acre));