diff --git a/CHANGELOG.md b/CHANGELOG.md
index 89352601..cfec2e98 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - Allow POST requests from cross-origin clients ([#60](https://github.com/developmentseed/titiler-cmr/pull/60))
 
+- Handle case where `ResolutionAndCoordinateSystem` is not available for calculating time series request size ([#62](https://github.com/developmentseed/titiler-cmr/pull/62))
+
 ### Changed
 
 - Add `s3_auth_strategy` and `aws_request_payer` to `AppSettings`: <https://github.com/developmentseed/titiler-cmr/pull/58>
diff --git a/tests/cassettes/test_utils/test_calculate_request_size.yaml b/tests/cassettes/test_utils/test_calculate_request_size.yaml
new file mode 100644
index 00000000..ccb1e59d
--- /dev/null
+++ b/tests/cassettes/test_utils/test_calculate_request_size.yaml
@@ -0,0 +1,323 @@
+interactions:
+- request:
+    body: null
+    headers:
+      Accept:
+      - '*/*'
+      Accept-Encoding:
+      - gzip, deflate
+      Connection:
+      - keep-alive
+      User-Agent:
+      - earthaccess v0.11.0
+      authorization:
+      - DUMMY
+    method: GET
+    uri: https://cmr.earthdata.nasa.gov/search/collections.umm_json?has_granules=true&include_granule_counts=true&concept_id%5B%5D=C2723754864-GES_DISC&page_size=2000
+  response:
+    body:
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+      - DUMMY
+    method: GET
+    uri: https://cmr.earthdata.nasa.gov/search/collections.umm_json?has_granules=true&include_granule_counts=true&concept_id%5B%5D=C2036881735-POCLOUD&page_size=2000
+  response:
+    body:
+      string: !!binary |
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+        eDUAAA==
+    headers:
+      Access-Control-Allow-Origin:
+      - '*'
+      Access-Control-Expose-Headers:
+      - CMR-Hits, CMR-Request-Id, X-Request-Id, CMR-Scroll-Id, CMR-Search-After, CMR-Timed-Out,
+        CMR-Shapefile-Original-Point-Count, CMR-Shapefile-Simplified-Point-Count
+      CMR-Hits:
+      - '1'
+      CMR-Request-Id:
+      - 4fe34233-943e-478d-b868-67e374dd170c
+      CMR-Search-After:
+      - '[0.0,400.0,"GAMSSA_28km-ABOM-L4-GLOB-v01","1.0",2036881735,14]'
+      CMR-Took:
+      - '428'
+      Connection:
+      - keep-alive
+      Content-Encoding:
+      - gzip
+      Content-MD5:
+      - d18ecd9d9bae18b7a2a20b3c47aa3eef
+      Content-SHA1:
+      - 06d318219fb8d95426a9fdbd5947d9efe55640c4
+      Content-Type:
+      - application/vnd.nasa.cmr.umm_results+json;version=1.18.4; charset=utf-8
+      Date:
+      - Wed, 25 Jun 2025 17:57:56 GMT
+      Server:
+      - ServerTokens ProductOnly
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Transfer-Encoding:
+      - chunked
+      Vary:
+      - Accept-Encoding, User-Agent
+      Via:
+      - 1.1 f1f259972a1922859cce8cd3da009a44.cloudfront.net (CloudFront)
+      X-Amz-Cf-Id:
+      - gw7SCUBH2pRdDLfFKpSPFb645ewgICl0lkW4vdQh494JYvsZyHw1Yw==
+      X-Amz-Cf-Pop:
+      - MSP50-P2
+      X-Cache:
+      - Miss from cloudfront
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - SAMEORIGIN
+      X-Request-Id:
+      - gw7SCUBH2pRdDLfFKpSPFb645ewgICl0lkW4vdQh494JYvsZyHw1Yw==
+      X-XSS-Protection:
+      - 1; mode=block
+    status:
+      code: 200
+      message: OK
+version: 1
diff --git a/tests/cassettes/test_utils/test_calculate_request_size_no_resolution.yaml b/tests/cassettes/test_utils/test_calculate_request_size_no_resolution.yaml
new file mode 100644
index 00000000..7aa10de5
--- /dev/null
+++ b/tests/cassettes/test_utils/test_calculate_request_size_no_resolution.yaml
@@ -0,0 +1,183 @@
+interactions:
+- request:
+    body: null
+    headers:
+      Accept:
+      - '*/*'
+      Accept-Encoding:
+      - gzip, deflate
+      Connection:
+      - keep-alive
+      User-Agent:
+      - earthaccess v0.11.0
+      authorization:
+      - DUMMY
+    method: GET
+    uri: https://cmr.earthdata.nasa.gov/search/collections.umm_json?has_granules=true&include_granule_counts=true&concept_id%5B%5D=C2723754864-GES_DISC&page_size=2000
+  response:
+    body:
+      string: !!binary |
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+    headers:
+      Access-Control-Allow-Origin:
+      - '*'
+      Access-Control-Expose-Headers:
+      - CMR-Hits, CMR-Request-Id, X-Request-Id, CMR-Scroll-Id, CMR-Search-After, CMR-Timed-Out,
+        CMR-Shapefile-Original-Point-Count, CMR-Shapefile-Simplified-Point-Count
+      CMR-Hits:
+      - '1'
+      CMR-Request-Id:
+      - ca805623-9bfc-47fa-a00a-fa92e2e5053c
+      CMR-Search-After:
+      - '[0.0,3200.0,"GPM_3IMERGDF","7",2723754864,20]'
+      CMR-Took:
+      - '453'
+      Connection:
+      - keep-alive
+      Content-Encoding:
+      - gzip
+      Content-MD5:
+      - ee5eeae37eaca536a8ca99d52c5e7f98
+      Content-SHA1:
+      - 04404d0331b27687543997c956659a68ec045470
+      Content-Type:
+      - application/vnd.nasa.cmr.umm_results+json;version=1.18.4; charset=utf-8
+      Date:
+      - Wed, 25 Jun 2025 17:57:56 GMT
+      Server:
+      - ServerTokens ProductOnly
+      Strict-Transport-Security:
+      - max-age=31536000; includeSubDomains; preload
+      Transfer-Encoding:
+      - chunked
+      Vary:
+      - Accept-Encoding, User-Agent
+      Via:
+      - 1.1 a5e934660f9817baef055c1ec689c0b6.cloudfront.net (CloudFront)
+      X-Amz-Cf-Id:
+      - PykePVjn6U4vl5GXB-P-VN7SPBtI2h5n336TjfIljn_PTrI__aoc5w==
+      X-Amz-Cf-Pop:
+      - MSP50-P2
+      X-Cache:
+      - Miss from cloudfront
+      X-Content-Type-Options:
+      - nosniff
+      X-Frame-Options:
+      - SAMEORIGIN
+      X-Request-Id:
+      - PykePVjn6U4vl5GXB-P-VN7SPBtI2h5n336TjfIljn_PTrI__aoc5w==
+      X-XSS-Protection:
+      - 1; mode=block
+    status:
+      code: 200
+      message: OK
+version: 1
diff --git a/tests/test_utils.py b/tests/test_utils.py
new file mode 100644
index 00000000..cf0962c3
--- /dev/null
+++ b/tests/test_utils.py
@@ -0,0 +1,38 @@
+"""Tests for utils.py"""
+
+import pytest
+
+from titiler.cmr.utils import calculate_time_series_request_size
+
+
+@pytest.mark.vcr
+def test_calculate_request_size_no_resolution() -> None:
+    """If a concept_id does not include the horizontal resolution in the UMM metadata
+    it should return 0"""
+    request_size = calculate_time_series_request_size(
+        concept_id="C2723754864-GES_DISC",
+        n_time_steps=2,
+        minx=-180,
+        miny=-90,
+        maxx=180,
+        maxy=90,
+        coord_crs="epsg:4326",
+    )
+
+    assert request_size == 0
+
+
+@pytest.mark.vcr
+def test_calculate_request_size() -> None:
+    """A concept_id that DOES include the horizontal resolution will return a positive value"""
+    request_size = calculate_time_series_request_size(
+        concept_id="C2036881735-POCLOUD",
+        n_time_steps=2,
+        minx=-180,
+        miny=-90,
+        maxx=180,
+        maxy=90,
+        coord_crs="epsg:4326",
+    )
+
+    assert 0 < request_size < 1e10
diff --git a/titiler/cmr/utils.py b/titiler/cmr/utils.py
index 198dcaa1..709aa485 100644
--- a/titiler/cmr/utils.py
+++ b/titiler/cmr/utils.py
@@ -4,6 +4,7 @@
 
 """
 
+import logging
 import time
 from datetime import datetime
 from typing import Any, List, Optional, Sequence, Tuple, Type, Union
@@ -18,6 +19,8 @@
 
 from titiler.cmr.errors import InvalidDatetime
 
+logger = logging.getLogger(__name__)
+
 
 def retry(
     tries: int,
@@ -77,13 +80,21 @@ def parse_datetime(
     return datetime_, start, end
 
 
-def get_resolution_degrees(concept_id: str) -> Tuple[float, float]:
+def get_resolution_degrees(concept_id: str) -> Tuple[Optional[float], Optional[float]]:
     """Query CMR to get the resolution of a dataset using its concept_id. If the units are in meters
     convert to degrees using the rough conversion factor of 0.00001 degrees per meter"""
     ds = earthaccess.collection_query().concept_id(concept_id).get()[0]
-    resolution_info = ds["umm"]["SpatialExtent"]["HorizontalSpatialDomain"][
-        "ResolutionAndCoordinateSystem"
-    ]["HorizontalDataResolution"]["GenericResolutions"][0]
+
+    try:
+        resolution_info = ds["umm"]["SpatialExtent"]["HorizontalSpatialDomain"][
+            "ResolutionAndCoordinateSystem"
+        ]["HorizontalDataResolution"]["GenericResolutions"][0]
+    except KeyError:
+        logger.warning(
+            f"could not find HorizontalDataResolution for concept_id {concept_id}"
+        )
+        return (None, None)
+
     units = resolution_info["Unit"].lower()
     if units not in ["meters", "decimal degrees"]:
         raise ValueError(
@@ -124,6 +135,9 @@ def calculate_time_series_request_size(
     as a total number of pixels read across the entire time series
     """
     xres, yres = get_resolution_degrees(concept_id)
+    if not (xres and yres):
+        return 0
+
     minx, miny, maxx, maxy = get_bbox_degrees(minx, miny, maxx, maxy, coord_crs)
 
     n_pixels_per_request = (maxx - minx) / xres * (maxy - miny) / yres