diff --git a/homeassistant/components/amberelectric/helpers.py b/homeassistant/components/amberelectric/helpers.py
index 3ce85ea29bcf..9b26ab542bb5 100644
--- a/homeassistant/components/amberelectric/helpers.py
+++ b/homeassistant/components/amberelectric/helpers.py
@@ -24,5 +24,5 @@ def normalize_descriptor(descriptor: PriceDescriptor | None) -> str | None:
 
 
 def format_cents_to_dollars(cents: float) -> float:
-    """Return a formatted conversion from cents to dollars."""
-    return round(cents / 100, 2)
+    """Convert cents per kWh to dollars per kWh."""
+    return cents / 100
diff --git a/tests/components/amberelectric/test_helpers.py b/tests/components/amberelectric/test_helpers.py
index 958c60fd1b33..7b5167492fdb 100644
--- a/tests/components/amberelectric/test_helpers.py
+++ b/tests/components/amberelectric/test_helpers.py
@@ -1,8 +1,12 @@
 """Test formatters."""
 
 from amberelectric.models.price_descriptor import PriceDescriptor
+import pytest
 
-from homeassistant.components.amberelectric.helpers import normalize_descriptor
+from homeassistant.components.amberelectric.helpers import (
+    format_cents_to_dollars,
+    normalize_descriptor,
+)
 
 
 def test_normalize_descriptor() -> None:
@@ -15,3 +19,18 @@ def test_normalize_descriptor() -> None:
     assert normalize_descriptor(PriceDescriptor.NEUTRAL) == "neutral"
     assert normalize_descriptor(PriceDescriptor.HIGH) == "high"
     assert normalize_descriptor(PriceDescriptor.SPIKE) == "spike"
+
+
+@pytest.mark.parametrize(
+    ("cents", "expected"),
+    [
+        pytest.param(8.8, 8.8 / 100, id="general"),
+        pytest.param(4.4, 4.4 / 100, id="controlled_load"),
+        pytest.param(1.1, 1.1 / 100, id="feed_in"),
+        pytest.param(0.09619, 0.0009619, id="near_zero"),
+        pytest.param(-0.09619, -0.0009619, id="near_zero_negative"),
+    ],
+)
+def test_format_cents_to_dollars(cents: float, expected: float) -> None:
+    """Test cents-to-dollars conversion preserves source precision."""
+    assert format_cents_to_dollars(cents) == expected
diff --git a/tests/components/amberelectric/test_sensor.py b/tests/components/amberelectric/test_sensor.py
index 0d979a2021c4..36e489bb77b8 100644
--- a/tests/components/amberelectric/test_sensor.py
+++ b/tests/components/amberelectric/test_sensor.py
@@ -16,11 +16,11 @@ async def test_general_price_sensor(
     assert len(hass.states.async_all()) == 6
     price = hass.states.get("sensor.mock_title_general_price")
     assert price
-    assert price.state == "0.09"
+    assert price.state == "0.088"
     attributes = price.attributes
     assert attributes["duration"] == 30
     assert attributes["date"] == "2021-09-21"
-    assert attributes["per_kwh"] == 0.09
+    assert attributes["per_kwh"] == 8.8 / 100
     assert attributes["nem_date"] == "2021-09-21T08:30:00+10:00"
     assert attributes["spot_per_kwh"] == 0.01
     assert attributes["start_time"] == "2021-09-21T08:00:00+10:00"
@@ -44,8 +44,8 @@ async def test_general_price_sensor_with_range(
     price = hass.states.get("sensor.mock_title_general_price")
     assert price
     attributes = price.attributes
-    assert attributes.get("range_min") == 0.07
-    assert attributes.get("range_max") == 0.09
+    assert attributes.get("range_min") == 6.7 / 100
+    assert attributes.get("range_max") == 9.1 / 100
 
 
 @pytest.mark.usefixtures("mock_amber_client_general_and_controlled_load")
@@ -58,11 +58,11 @@ async def test_general_and_controlled_load_price_sensor(
     assert len(hass.states.async_all()) == 9
     price = hass.states.get("sensor.mock_title_controlled_load_price")
     assert price
-    assert price.state == "0.04"
+    assert price.state == "0.044"
     attributes = price.attributes
     assert attributes["duration"] == 30
     assert attributes["date"] == "2021-09-21"
-    assert attributes["per_kwh"] == 0.04
+    assert attributes["per_kwh"] == 4.4 / 100
     assert attributes["nem_date"] == "2021-09-21T08:30:00+10:00"
     assert attributes["spot_per_kwh"] == 0.01
     assert attributes["start_time"] == "2021-09-21T08:00:00+10:00"
@@ -83,11 +83,11 @@ async def test_general_and_feed_in_price_sensor(
     assert len(hass.states.async_all()) == 9
     price = hass.states.get("sensor.mock_title_feed_in_price")
     assert price
-    assert price.state == "-0.01"
+    assert price.state == "-0.011"
     attributes = price.attributes
     assert attributes["duration"] == 30
     assert attributes["date"] == "2021-09-21"
-    assert attributes["per_kwh"] == -0.01
+    assert attributes["per_kwh"] == -1.1 / 100
     assert attributes["nem_date"] == "2021-09-21T08:30:00+10:00"
     assert attributes["spot_per_kwh"] == 0.01
     assert attributes["start_time"] == "2021-09-21T08:00:00+10:00"
@@ -108,7 +108,7 @@ async def test_general_forecast_sensor(
     assert len(hass.states.async_all()) == 6
     price = hass.states.get("sensor.mock_title_general_forecast")
     assert price
-    assert price.state == "0.09"
+    assert price.state == "0.088"
     attributes = price.attributes
     assert attributes["channel_type"] == "general"
     assert attributes["attribution"] == "Data provided by Amber Electric"
@@ -116,9 +116,9 @@ async def test_general_forecast_sensor(
     first_forecast = attributes["forecasts"][0]
     assert first_forecast["duration"] == 30
     assert first_forecast["date"] == "2021-09-21"
-    assert first_forecast["per_kwh"] == 0.09
+    assert first_forecast["per_kwh"] == 8.8 / 100
     assert first_forecast["nem_date"] == "2021-09-21T09:00:00+10:00"
-    assert first_forecast["spot_per_kwh"] == 0.01
+    assert first_forecast["spot_per_kwh"] == 1.1 / 100
     assert first_forecast["start_time"] == "2021-09-21T08:30:00+10:00"
     assert first_forecast["end_time"] == "2021-09-21T09:00:00+10:00"
     assert first_forecast["renewables"] == 50
@@ -140,8 +140,8 @@ async def test_general_forecast_sensor_with_range(
     assert price
     attributes = price.attributes
     first_forecast = attributes["forecasts"][0]
-    assert first_forecast.get("range_min") == 0.07
-    assert first_forecast.get("range_max") == 0.09
+    assert first_forecast.get("range_min") == 6.7 / 100
+    assert first_forecast.get("range_max") == 9.1 / 100
 
 
 @pytest.mark.usefixtures("mock_amber_client_general_and_controlled_load")
@@ -154,7 +154,7 @@ async def test_controlled_load_forecast_sensor(
     assert len(hass.states.async_all()) == 9
     price = hass.states.get("sensor.mock_title_controlled_load_forecast")
     assert price
-    assert price.state == "0.04"
+    assert price.state == "0.044"
     attributes = price.attributes
     assert attributes["channel_type"] == "controlledLoad"
     assert attributes["attribution"] == "Data provided by Amber Electric"
@@ -162,9 +162,9 @@ async def test_controlled_load_forecast_sensor(
     first_forecast = attributes["forecasts"][0]
     assert first_forecast["duration"] == 30
     assert first_forecast["date"] == "2021-09-21"
-    assert first_forecast["per_kwh"] == 0.04
+    assert first_forecast["per_kwh"] == 4.4 / 100
     assert first_forecast["nem_date"] == "2021-09-21T09:00:00+10:00"
-    assert first_forecast["spot_per_kwh"] == 0.01
+    assert first_forecast["spot_per_kwh"] == 1.1 / 100
     assert first_forecast["start_time"] == "2021-09-21T08:30:00+10:00"
     assert first_forecast["end_time"] == "2021-09-21T09:00:00+10:00"
     assert first_forecast["renewables"] == 50
@@ -181,7 +181,7 @@ async def test_feed_in_forecast_sensor(
     assert len(hass.states.async_all()) == 9
     price = hass.states.get("sensor.mock_title_feed_in_forecast")
     assert price
-    assert price.state == "-0.01"
+    assert price.state == "-0.011"
     attributes = price.attributes
     assert attributes["channel_type"] == "feedIn"
     assert attributes["attribution"] == "Data provided by Amber Electric"
@@ -189,9 +189,9 @@ async def test_feed_in_forecast_sensor(
     first_forecast = attributes["forecasts"][0]
     assert first_forecast["duration"] == 30
     assert first_forecast["date"] == "2021-09-21"
-    assert first_forecast["per_kwh"] == -0.01
+    assert first_forecast["per_kwh"] == -1.1 / 100
     assert first_forecast["nem_date"] == "2021-09-21T09:00:00+10:00"
-    assert first_forecast["spot_per_kwh"] == 0.01
+    assert first_forecast["spot_per_kwh"] == 1.1 / 100
     assert first_forecast["start_time"] == "2021-09-21T08:30:00+10:00"
     assert first_forecast["end_time"] == "2021-09-21T09:00:00+10:00"
     assert first_forecast["renewables"] == 50
diff --git a/tests/components/amberelectric/test_services.py b/tests/components/amberelectric/test_services.py
index 2bc4546949ed..26a5503a39bb 100644
--- a/tests/components/amberelectric/test_services.py
+++ b/tests/components/amberelectric/test_services.py
@@ -41,8 +41,8 @@ async def test_get_general_forecasts(
     assert first["duration"] == 30
     assert first["date"] == "2021-09-21"
     assert first["nem_date"] == "2021-09-21T09:00:00+10:00"
-    assert first["per_kwh"] == 0.09
-    assert first["spot_per_kwh"] == 0.01
+    assert first["per_kwh"] == 8.8 / 100
+    assert first["spot_per_kwh"] == 1.1 / 100
     assert first["start_time"] == "2021-09-21T08:30:00+10:00"
     assert first["end_time"] == "2021-09-21T09:00:00+10:00"
     assert first["renewables"] == 50
@@ -73,8 +73,8 @@ async def test_get_controlled_load_forecasts(
     assert first["duration"] == 30
     assert first["date"] == "2021-09-21"
     assert first["nem_date"] == "2021-09-21T09:00:00+10:00"
-    assert first["per_kwh"] == 0.04
-    assert first["spot_per_kwh"] == 0.01
+    assert first["per_kwh"] == 4.4 / 100
+    assert first["spot_per_kwh"] == 1.1 / 100
     assert first["start_time"] == "2021-09-21T08:30:00+10:00"
     assert first["end_time"] == "2021-09-21T09:00:00+10:00"
     assert first["renewables"] == 50
@@ -105,8 +105,8 @@ async def test_get_feed_in_forecasts(
     assert first["duration"] == 30
     assert first["date"] == "2021-09-21"
     assert first["nem_date"] == "2021-09-21T09:00:00+10:00"
-    assert first["per_kwh"] == -0.01
-    assert first["spot_per_kwh"] == 0.01
+    assert first["per_kwh"] == -1.1 / 100
+    assert first["spot_per_kwh"] == 1.1 / 100
     assert first["start_time"] == "2021-09-21T08:30:00+10:00"
     assert first["end_time"] == "2021-09-21T09:00:00+10:00"
     assert first["renewables"] == 50