diff --git a/dpdata/qe/scf.py b/dpdata/qe/scf.py
index 7b6a70aa..341261d2 100755
--- a/dpdata/qe/scf.py
+++ b/dpdata/qe/scf.py
@@ -7,9 +7,13 @@
 
 from dpdata.utils import open_file
 
-ry2ev = 13.605693009
-bohr2ang = 0.52917721067
-kbar2evperang3 = 1e3 / 1.602176621e6
+from .traj import (
+    kbar2evperang3,
+    ry2ev,
+)
+from .traj import (
+    length_convert as bohr2ang,
+)
 
 _QE_BLOCK_KEYWORDS = [
     "ATOMIC_SPECIES",
diff --git a/tests/test_qe_pw_scf.py b/tests/test_qe_pw_scf.py
index a38e2d05..7fe803b9 100644
--- a/tests/test_qe_pw_scf.py
+++ b/tests/test_qe_pw_scf.py
@@ -161,11 +161,11 @@ def test_virial(self):
 
     def test_energy(self):
         ref_energy = -219.74425946528794
-        self.assertAlmostEqual(self.system_ch4.data["energies"][0], ref_energy)
+        self.assertAlmostEqual(self.system_ch4.data["energies"][0] / ref_energy, 1.0)
         ref_energy = -30007.651851226798
-        self.assertAlmostEqual(self.system_h2o.data["energies"][0], ref_energy)
+        self.assertAlmostEqual(self.system_h2o.data["energies"][0] / ref_energy, 1.0)
         ref_energy = -219.7153691367526562
-        self.assertAlmostEqual(self.system_ch4_2.data["energies"][0], ref_energy)
+        self.assertAlmostEqual(self.system_ch4_2.data["energies"][0] / ref_energy, 1.0)
 
 
 class TestPWSCFLabeledOutput(unittest.TestCase, TestPWSCFSinglePointEnergy):
diff --git a/tests/test_qe_pw_scf_energy_bug.py b/tests/test_qe_pw_scf_energy_bug.py
index b66ce924..a513dc7c 100644
--- a/tests/test_qe_pw_scf_energy_bug.py
+++ b/tests/test_qe_pw_scf_energy_bug.py
@@ -8,7 +8,7 @@
 class TestPWSCFSinglePointEnergy:
     def test_energy(self):
         ref_energy = -296.08379065679094669
-        self.assertAlmostEqual(self.system_al.data["energies"][0], ref_energy)
+        self.assertAlmostEqual(self.system_al.data["energies"][0] / ref_energy, 1.0)
 
 
 class TestPWSCFLabeledOutput(unittest.TestCase, TestPWSCFSinglePointEnergy):