diff --git a/ml_peg/calcs/bulk_crystal/equation_of_state/calc_equation_of_state.py b/ml_peg/calcs/bulk_crystal/equation_of_state/calc_equation_of_state.py
new file mode 100644
index 000000000..6431482c5
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+++ b/ml_peg/calcs/bulk_crystal/equation_of_state/calc_equation_of_state.py
@@ -0,0 +1,118 @@
+"""Run calculations for EOS tests."""
+
+from __future__ import annotations
+from copy import copy
+from pathlib import Path
+from typing import Any
+from datetime import datetime
+from glob import glob
+
+from ase import units
+from ase.io import read, write
+
+import pandas as pd
+import numpy as np
+import pytest
+
+from ml_peg.calcs.utils.utils import download_s3_data
+from ml_peg.models.get_models import load_models
+from ml_peg.models.models import current_models
+
+
+from ase.lattice.cubic import SimpleCubicFactory, \
+                              FaceCenteredCubic, BodyCenteredCubic
+
+MODELS = load_models(current_models)
+
+DATA_PATH = Path(__file__).parent / "../../../../inputs/bulk_crystal/equation_of_state/"
+OUT_PATH = Path(__file__).parent / "outputs"
+
+
+class A15Factory(SimpleCubicFactory):
+    "A factory for creating A15 lattices."
+    xtal_name = "A15"
+    bravais_basis = [[0, 0, 0],
+                     [0.5, 0.5, 0.5],
+                     [0.5, 0.25, 0.0],
+                     [0.5, 0.75, 0.0],
+                     [0.0, 0.5, 0.25],
+                     [0.0, 0.5, 0.75],
+                     [0.25, 0.0, 0.5],
+                     [0.75, 0.0, 0.5]]
+
+
+A15 = A15Factory()
+
+lattices = {"BCC": BodyCenteredCubic,
+            "FCC": FaceCenteredCubic,
+            "A15": A15}
+
+
+def equation_of_state(calc, lattice, symbol="W", size = (2, 2, 2),
+                      volumes_per_atoms=np.linspace(12, 22, 10, endpoint=False)):
+    """Compute the equation of state for a given element and lattice.
+    """
+    
+    # dummy call to have calc_num_atoms available
+    lattice(symbol="W", latticeconstant=3.16) 
+    lattice_constants = (volumes_per_atoms * lattice.calc_num_atoms()) ** (1 / 3)
+
+    structures = [lattice(latticeconstant=lc, size=size, symbol=symbol) for lc in lattice_constants]
+    for structure in structures:
+        structure.calc = calc
+
+    energies = [structure.get_potential_energy() / len(structure) for structure in structures]
+
+    return np.array(lattice_constants), np.array(energies)
+
+
+@pytest.mark.parametrize("mlip", MODELS.items())
+def test_equation_of_state(mlip: tuple[str, Any]) -> None:
+    """Test equation of state calculation.
+    For the moment only for three BCC metals"""
+
+    model_name, model = mlip
+    calc = model.get_calculator()
+
+    fns = list(DATA_PATH.glob("*DFT*"))
+      
+       
+    for fn in fns:
+        element = fn.name.split("_")[0]
+        print(f"Starting EOS calculations for {element} with model {model_name}")
+
+        dft_data = pd.read_csv(fn, comment="#")  
+
+        volumes_per_atoms = np.linspace(np.round(dft_data[dft_data.columns[0]].min() * 0.95), 
+                                        np.round(dft_data[dft_data.columns[0]].max() * 1.05), 50, endpoint=False)
+        results = {"V/atom": volumes_per_atoms}
+        
+        phases = [col.split("_")[1] for col in dft_data.columns if "Delta" in col]
+
+        for phase in phases:
+            assert phase in lattices, f"Lattice {phase} not implemented for EOS test."
+            lattice = lattices[phase]
+            start_time = datetime.now()
+            print(f"Start time for {phase} @ {model_name}: {start_time}")
+            
+            lattice_constants, energies = equation_of_state(
+                calc, lattice, symbol=element, volumes_per_atoms=volumes_per_atoms
+            )
+            
+            end_time = datetime.now()
+            duration = end_time - start_time
+            hours, remainder = divmod(duration.seconds, 3600)
+            minutes, seconds = divmod(remainder, 60)
+            print(f"End time for {phase} @ {model_name}: {end_time}")
+            print(f"Duration for {phase} @ {model_name}: {hours} hours {minutes} minutes {seconds} seconds")
+            print(duration)
+
+
+            results[f"{phase}_a"] = lattice_constants
+            results[f"{phase}_E"] = energies
+
+        write_dir = OUT_PATH / model_name
+        df = pd.DataFrame(results)
+        output_file = write_dir / f"{element}_eos_results.csv"
+        write_dir.mkdir(parents=True, exist_ok=True)
+        df.to_csv(output_file, index=False)
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