diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index 73b23e8bd..0e2916d8b 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 3.15.2
+current_version = 3.15.3
 commit = True
 tag = True
 
diff --git a/.cookiecutterrc b/.cookiecutterrc
index 9a89ff585..033f8f968 100644
--- a/.cookiecutterrc
+++ b/.cookiecutterrc
@@ -54,7 +54,7 @@ default_context:
     sphinx_doctest: "no"
     sphinx_theme: "sphinx-py3doc-enhanced-theme"
     test_matrix_separate_coverage: "no"
-    version: 3.15.2
+    version: 3.15.3
     version_manager: "bump2version"
     website: "https://github.com/NREL"
     year_from: "2023"
diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index fbe40213b..5e8fb1c0d 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -8,6 +8,8 @@ GEOPHIRES v3 (2023-2026)
 3.15
 ^^^^
 
+3.15.3: `Acre unit support (HIP-RA-X Reservoir Area) <https://github.com/softwareengineerprogrammer/GEOPHIRES/pull/176>`__ | `release <https://github.com/NREL/GEOPHIRES-X/releases/tag/v3.15.3>`__
+
 3.15: `Calculate S-DAC carbon revenue (BICYCLE); Reservoir Stimulation Capital Cost per Fracture Surface Area <https://github.com/NREL/GEOPHIRES-X/pull/510>`__ | `release <https://github.com/NREL/GEOPHIRES-X/releases/tag/v3.15.2>`__ | **Changed:** S-DAC carbon revenue is now calculated. See `the tracking issue <https://github.com/NatLabRockies/GEOPHIRES-X/issues/341>`__ for details.
 
 3.14
diff --git a/README.rst b/README.rst
index 584e4fe23..d2e8f954f 100644
--- a/README.rst
+++ b/README.rst
@@ -58,9 +58,9 @@ Free software: `MIT license <LICENSE>`__
     :alt: Supported implementations
     :target: https://pypi.org/project/geophires-x
 
-.. |commits-since| image:: https://img.shields.io/github/commits-since/softwareengineerprogrammer/GEOPHIRES-X/v3.15.2.svg
+.. |commits-since| image:: https://img.shields.io/github/commits-since/softwareengineerprogrammer/GEOPHIRES-X/v3.15.3.svg
     :alt: Commits since latest release
-    :target: https://github.com/softwareengineerprogrammer/GEOPHIRES-X/compare/v3.15.2...main
+    :target: https://github.com/softwareengineerprogrammer/GEOPHIRES-X/compare/v3.15.3...main
 
 .. |docs| image:: https://readthedocs.org/projects/GEOPHIRES-X/badge/?style=flat
     :target: https://softwareengineerprogrammer.github.io/GEOPHIRES
diff --git a/docs/conf.py b/docs/conf.py
index 89bf6c3b6..5513f6159 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -18,7 +18,7 @@
 year = '2025'
 author = 'NREL'
 copyright = f'{year}, {author}'
-version = release = '3.15.2'
+version = release = '3.15.3'
 
 pygments_style = 'trac'
 templates_path = ['./templates']
diff --git a/setup.py b/setup.py
index dcd6fa1f6..e6989a316 100755
--- a/setup.py
+++ b/setup.py
@@ -13,7 +13,7 @@ def read(*names, **kwargs):
 
 setup(
     name='geophires-x',
-    version='3.15.2',
+    version='3.15.3',
     license='MIT',
     description='GEOPHIRES is a free and open-source geothermal techno-economic simulator.',
     long_description='{}\n{}'.format(
diff --git a/src/geophires_x/Parameter.py b/src/geophires_x/Parameter.py
index c7f332737..632976c82 100644
--- a/src/geophires_x/Parameter.py
+++ b/src/geophires_x/Parameter.py
@@ -14,6 +14,7 @@
 
 from abc import ABC
 
+from pint import UndefinedUnitError
 from pint.facets.plain import PlainQuantity
 
 from geophires_x.OptionList import GeophiresInputEnum
@@ -947,8 +948,13 @@ def LookupUnits(sUnitText: str):
                     return item, uType
 
     # No match was found with the unit text string, so try with the canonical symbol (if different).
-    symbol = _ureg.get_symbol(sUnitText)
-    if symbol != sUnitText: return LookupUnits(symbol)
+    try:
+        symbol = _ureg.get_symbol(sUnitText)
+        if symbol != sUnitText:
+            return LookupUnits(symbol)
+    except UndefinedUnitError as _uue:
+        return sUnitText, uType
+
     return None, None
 
 
diff --git a/src/geophires_x/Units.py b/src/geophires_x/Units.py
index 0ab73c338..11a0e8336 100644
--- a/src/geophires_x/Units.py
+++ b/src/geophires_x/Units.py
@@ -135,6 +135,7 @@ class AreaUnit(str, Enum):
     FEET2 = "ft**2"
     INCHES2 = "in**2"
     MILES2 = "mi**2"
+    ACRES = 'acre'
 
 
 class VolumeUnit(str, Enum):
diff --git a/src/geophires_x/__init__.py b/src/geophires_x/__init__.py
index 832ff3c2c..1394f3dcd 100644
--- a/src/geophires_x/__init__.py
+++ b/src/geophires_x/__init__.py
@@ -1 +1 @@
-__version__ = '3.15.2'
+__version__ = '3.15.3'
diff --git a/tests/hip_ra_x_tests/hip-ra-x-area-acres.txt b/tests/hip_ra_x_tests/hip-ra-x-area-acres.txt
new file mode 100644
index 000000000..9703b736b
--- /dev/null
+++ b/tests/hip_ra_x_tests/hip-ra-x-area-acres.txt
@@ -0,0 +1,6 @@
+Reservoir Temperature, 212.5
+Rejection Temperature, 60.0
+Reservoir Porosity, 10.0
+Reservoir Area, 109930 acre
+Reservoir Thickness, 0.25
+Reservoir Life Cycle, 25
diff --git a/tests/hip_ra_x_tests/test_hip_ra_x.py b/tests/hip_ra_x_tests/test_hip_ra_x.py
index 0ff983dc5..68a86e5da 100644
--- a/tests/hip_ra_x_tests/test_hip_ra_x.py
+++ b/tests/hip_ra_x_tests/test_hip_ra_x.py
@@ -474,7 +474,16 @@ def test_hip_ra_input_parameters_init(self):
         with self.assertRaises(ValueError):
             HipRaInputParameters(1)
 
-    def _new_hip_ra_test_instance(self, enable_hip_ra_logging_config=False, pre_re_stash_runner=None) -> HIP_RA_X:
+    def test_area_acre(self):
+        result: HipRaResult = HipRaXClient().get_hip_ra_x_result(
+            HipRaInputParameters(self._get_test_file_path('hip-ra-x-area-acres.txt'))
+        )
+
+        self.assertEqual('km**2', result.result['SUMMARY OF INPUTS']['Reservoir Area']['unit'])
+        self.assertAlmostEqual(444.9, result.result['SUMMARY OF INPUTS']['Reservoir Area']['value'], places=1)
+
+    @staticmethod
+    def _new_hip_ra_test_instance(enable_hip_ra_logging_config=False, pre_re_stash_runner=None) -> HIP_RA_X:
         stash_cwd = Path.cwd()
         stash_sys_argv = sys.argv