diff --git a/doc b/doc
index 92e168a..5335524 160000
--- a/doc
+++ b/doc
@@ -1 +1 @@
-Subproject commit 92e168a288b396a7a97d200b80affdf8690bd03d
+Subproject commit 5335524d3e57c7551f31c7e21fc04c464b23429a
diff --git a/matemat/util/__init__.py b/matemat/util/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/matemat/util/currency_format.py b/matemat/util/currency_format.py
new file mode 100644
index 0000000..a163238
--- /dev/null
+++ b/matemat/util/currency_format.py
@@ -0,0 +1,56 @@
+
+
+def format_chf(value: int, with_currencysign: bool = True) -> str:
+    """
+    Formats a centime value into a commonly understood representation ("CHF -13.37").
+
+    :param value: The value to format, in centimes.
+    :param with_currencysign: Whether to include the currency prefix ("CHF ") in the output.
+    :return: A human-readable string representation.
+    """
+    sign: str = ''
+    if value < 0:
+        # As // and % round towards -Inf, convert into a positive value and prepend the negative sign
+        sign = '-'
+        value = -value
+    # Split into full francs and fractions (centimes)
+    full: int = value // 100
+    frac: int = value % 100
+    csign: str = 'CHF ' if with_currencysign else ''
+    # Put it all together; centimes are always padded with 2 zeros
+    return f'{csign}{sign}{full}.{frac:02}'
+
+
+def parse_chf(value: str) -> int:
+    """
+    Parse a currency value into machine-readable format (integer centimes).  The prefix "CHF", the decimal point, and
+    digits after the decimal point are optional.
+
+    :param value: The value to parse.
+    :return: An integer representation of the value.
+    :raises: Value error: If more than two digits after the decimal point are present.
+    """
+    # Remove optional leading "CHF" and strip whitespace
+    value = value.strip()
+    if value.startswith('CHF'):
+        value = value[3:]
+    value = value.strip()
+    if '.' not in value:
+        # already is an integer; parse and turn into centimes
+        return int(value, 10) * 100
+    # Split at the decimal point
+    full, frac = value.split('.', 1)
+    if len(frac) > 2:
+        raise ValueError('Needs max. 2 digits after decimal point')
+    elif len(frac) < 2:
+        # Right-pad fraction with zeros ("x." -> "x.00", "x.x" -> "x.x0")
+        frac = frac + '0' * (2 - len(frac))
+    # Parse both parts
+    ifrac: int = int(frac, 10)
+    ifull: int = int(full, 10)
+    if ifrac < 0:
+        raise ValueError('Fraction part must not be negative.')
+    if full.startswith('-'):
+        ifrac = -ifrac
+    # Combine into centime integer
+    return ifull * 100 + ifrac
diff --git a/matemat/util/test/__init__.py b/matemat/util/test/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/matemat/webserver/test/test_currency_format.py b/matemat/util/test/test_currency_format.py
similarity index 98%
rename from matemat/webserver/test/test_currency_format.py
rename to matemat/util/test/test_currency_format.py
index 6385852..882ddac 100644
--- a/matemat/webserver/test/test_currency_format.py
+++ b/matemat/util/test/test_currency_format.py
@@ -1,7 +1,7 @@
 
 import unittest
 
-from matemat.webserver.util import format_chf, parse_chf
+from matemat.util.currency_format import format_chf, parse_chf
 
 
 class TestCurrencyFormat(unittest.TestCase):
diff --git a/matemat/webserver/httpd.py b/matemat/webserver/httpd.py
index 4d6d87c..e69c859 100644
--- a/matemat/webserver/httpd.py
+++ b/matemat/webserver/httpd.py
@@ -17,7 +17,8 @@ import jinja2
 from matemat import __version__ as matemat_version
 from matemat.exceptions import HttpException
 from matemat.webserver import RequestArguments, PageletResponse, RedirectResponse, TemplateResponse
-from matemat.webserver.util import parse_args, format_chf
+from matemat.webserver.util import parse_args
+from matemat.util.currency_format import format_chf
 
 #
 # Python internal class hacks
diff --git a/matemat/webserver/pagelets/modproduct.py b/matemat/webserver/pagelets/modproduct.py
index e0e6814..51da39f 100644
--- a/matemat/webserver/pagelets/modproduct.py
+++ b/matemat/webserver/pagelets/modproduct.py
@@ -8,7 +8,7 @@ from matemat.webserver import pagelet, RequestArguments, PageletResponse, Redire
 from matemat.db import MatematDatabase
 from matemat.primitives import Product
 from matemat.exceptions import DatabaseConsistencyError, HttpException
-from matemat.webserver.util import parse_chf
+from matemat.util.currency_format import parse_chf
 
 
 @pagelet('/modproduct')
diff --git a/matemat/webserver/pagelets/moduser.py b/matemat/webserver/pagelets/moduser.py
index 4dda3f0..c51a05d 100644
--- a/matemat/webserver/pagelets/moduser.py
+++ b/matemat/webserver/pagelets/moduser.py
@@ -8,7 +8,7 @@ from matemat.webserver import pagelet, RequestArguments, PageletResponse, Redire
 from matemat.db import MatematDatabase
 from matemat.primitives import User
 from matemat.exceptions import DatabaseConsistencyError, HttpException
-from matemat.webserver.util import parse_chf
+from matemat.util.currency_format import parse_chf
 
 
 @pagelet('/moduser')
diff --git a/matemat/webserver/util.py b/matemat/webserver/util.py
index cd0d2ef..c95d303 100644
--- a/matemat/webserver/util.py
+++ b/matemat/webserver/util.py
@@ -136,59 +136,3 @@ def parse_args(request: str, postbody: Optional[bytes] = None, enctype: str = 't
             raise ValueError(f'Unsupported Content-Type: {enctype}')
     # Return the path and the parsed arguments
     return tokens.path, args
-
-
-def format_chf(value: int, with_currencysign: bool = True) -> str:
-    """
-    Formats a centime value into a commonly understood representation ("CHF -13.37").
-
-    :param value: The value to format, in centimes.
-    :param with_currencysign: Whether to include the currency prefix ("CHF ") in the output.
-    :return: A human-readable string representation.
-    """
-    sign: str = ''
-    if value < 0:
-        # As // and % round towards -Inf, convert into a positive value and prepend the negative sign
-        sign = '-'
-        value = -value
-    # Split into full francs and fractions (centimes)
-    full: int = value // 100
-    frac: int = value % 100
-    csign: str = 'CHF ' if with_currencysign else ''
-    # Put it all together; centimes are always padded with 2 zeros
-    return f'{csign}{sign}{full}.{frac:02}'
-
-
-def parse_chf(value: str) -> int:
-    """
-    Parse a currency value into machine-readable format (integer centimes).  The prefix "CHF", the decimal point, and
-    digits after the decimal point are optional.
-
-    :param value: The value to parse.
-    :return: An integer representation of the value.
-    :raises: Value error: If more than two digits after the decimal point are present.
-    """
-    # Remove optional leading "CHF" and strip whitespace
-    value = value.strip()
-    if value.startswith('CHF'):
-        value = value[3:]
-    value = value.strip()
-    if '.' not in value:
-        # already is an integer; parse and turn into centimes
-        return int(value, 10) * 100
-    # Split at the decimal point
-    full, frac = value.split('.', 1)
-    if len(frac) > 2:
-        raise ValueError('Needs max. 2 digits after decimal point')
-    elif len(frac) < 2:
-        # Right-pad fraction with zeros ("x." -> "x.00", "x.x" -> "x.x0")
-        frac = frac + '0' * (2 - len(frac))
-    # Parse both parts
-    ifrac: int = int(frac, 10)
-    ifull: int = int(full, 10)
-    if ifrac < 0:
-        raise ValueError('Fraction part must not be negative.')
-    if full.startswith('-'):
-        ifrac = -ifrac
-    # Combine into centime integer
-    return ifull * 100 + ifrac