diff --git a/extra/money/authors.txt b/extra/money/authors.txt
new file mode 100644
index 0000000000..5674120196
--- /dev/null
+++ b/extra/money/authors.txt
@@ -0,0 +1,2 @@
+Doug Coleman
+Slava Pestov
diff --git a/extra/money/money-tests.factor b/extra/money/money-tests.factor
new file mode 100644
index 0000000000..19d6b6c2aa
--- /dev/null
+++ b/extra/money/money-tests.factor
@@ -0,0 +1,21 @@
+USING: money parser tools.test ;
+IN: temporary
+
+[ -1/10 ] [ DECIMAL: -.1 ] unit-test
+[ -1/10 ] [ DECIMAL: -0.1 ] unit-test
+[ -1/10 ] [ DECIMAL: -00.10 ] unit-test
+
+[ 0 ] [ DECIMAL: .0 ] unit-test
+[ 0 ] [ DECIMAL: 0.0 ] unit-test
+[ 0 ] [ DECIMAL: 0. ] unit-test
+[ 0 ] [ DECIMAL: 0 ] unit-test
+[ 1/10 ] [ DECIMAL: .1 ] unit-test
+[ 1/10 ] [ DECIMAL: 0.1 ] unit-test
+[ 1/10 ] [ DECIMAL: 00.10 ] unit-test
+
+
+
+[ "DECIMAL: ." eval ] must-fail
+[ "DECIMAL: f" eval ] must-fail
+[ "DECIMAL: 0.f" eval ] must-fail
+[ "DECIMAL: f.0" eval ] must-fail
diff --git a/extra/money/money.factor b/extra/money/money.factor
new file mode 100644
index 0000000000..d742a3be5a
--- /dev/null
+++ b/extra/money/money.factor
@@ -0,0 +1,29 @@
+USING: io kernel math math.functions math.parser parser
+namespaces sequences splitting combinators continuations
+sequences.lib ;
+IN: money
+
+: dollars/cents ( dollars -- dollars cents )
+    100 * 100 /mod round ;
+
+: money. ( object -- )
+    dollars/cents
+    [
+        "$" %
+        swap number>string
+        <reversed> 3 group "," join <reversed> %
+        "." % number>string 2 48 pad-left %
+    ] "" make print ;
+
+TUPLE: not-a-decimal ;
+: DECIMAL:
+    scan
+    "." split dup length 1 2 between? [
+        T{ not-a-decimal } throw
+    ] unless
+    ?first2
+    >r dup ?first CHAR: - = [ drop t "0" ] [ f swap ] if r>
+    [ dup empty? [ drop "0" ] when ] 2apply
+    dup length
+    >r [ string>number dup [ T{ not-a-decimal } throw ] unless ] 2apply r>
+    10 swap ^ / + swap [ neg ] when parsed ; parsing
diff --git a/extra/money/summary.txt b/extra/money/summary.txt
new file mode 100644
index 0000000000..fcfaf151f6
--- /dev/null
+++ b/extra/money/summary.txt
@@ -0,0 +1 @@
+Utility for calculating money with rationals