diff --git a/golem/core/fileshelper.py b/golem/core/fileshelper.py
index 81d0edbd9c..b7432f5222 100644
--- a/golem/core/fileshelper.py
+++ b/golem/core/fileshelper.py
@@ -193,11 +193,7 @@ def du(path):
             logger.info("Can't open dir {}: {}".format(path, str(err)))
             return "-1"
 
-    human_readable_size, idx = memoryhelper.dir_size_to_display(size)
-    return "{} {}".format(
-        human_readable_size,
-        memoryhelper.translate_resource_index(idx)
-    )
+    return memoryhelper.dir_size_to_display(size)
 
 
 def relative_path(path, prefix):
diff --git a/golem/task/taskserver.py b/golem/task/taskserver.py
index 3673ba2a7f..c1fa97d502 100644
--- a/golem/task/taskserver.py
+++ b/golem/task/taskserver.py
@@ -92,6 +92,7 @@
 from golem.task.taskbase import AcceptClientVerdict
 from golem.task.taskconnectionshelper import TaskConnectionsHelper
 from golem.task.taskstate import TaskOp
+from golem.tools import memoryhelper
 from golem.utils import decode_hex
 from .server import concent
 from .server import helpers
@@ -1101,6 +1102,9 @@ def should_accept_provider(  # pylint: disable=too-many-return-statements
             provider_perf: float, max_memory_size: int,
             offer_hash: str) -> bool:
 
+        # max_memory_size: int KiB
+        max_memory_size_b = int(max_memory_size) * 1024  # Bytes
+
         node_name_id = short_node_id(node_id)
         ids = f'provider={node_name_id}, task_id={task_id}'
 
@@ -1141,9 +1145,22 @@ def should_accept_provider(  # pylint: disable=too-many-return-statements
                 })
             return False
 
-        if min_memory > (int(max_memory_size) * 1024):
-            logger.info('insufficient provider memory size: '
-                        f'{min_memory} B < {max_memory_size} KiB; {ids}')
+        if min_memory > max_memory_size_b:
+            logger.info(
+                'insufficient provider memory size:'
+                ' %(available)s < %(min_memory)s;'
+                ' Free at least %(missing)s; %(ids)s',
+                {
+                    'min_memory': memoryhelper.dir_size_to_display(min_memory),
+                    'available': memoryhelper.dir_size_to_display(
+                        max_memory_size_b,
+                    ),
+                    'missing': memoryhelper.dir_size_to_display(
+                        min_memory - max_memory_size_b,
+                    ),
+                    'ids': ids,
+                }
+            )
             self.notify_provider_rejected(
                 node_id=node_id, task_id=task_id,
                 reason=self.RejectedReason.memory_size,
diff --git a/golem/tools/memoryhelper.py b/golem/tools/memoryhelper.py
index b6d93ab9e2..1f26488c59 100644
--- a/golem/tools/memoryhelper.py
+++ b/golem/tools/memoryhelper.py
@@ -1,30 +1,11 @@
-import logging
-
-logger = logging.getLogger("tools")
-
-options = {
-    0: 'kB',
-    1: 'MB',
-    2: 'GB'
-}
-
-
 def dir_size_to_display(dir_size):
     if dir_size // (1024 * 1024 * 1024) > 0:
         dir_size = round(float(dir_size) / (1024 * 1024 * 1024), 1)
-        index = 2
-    elif dir_size // (1024 * 1024) > 0:
+        return f'{dir_size} GiB'
+    if dir_size // (1024 * 1024) > 0:
         dir_size = round(float(dir_size) / (1024 * 1024), 1)
-        index = 1
-    else:
+        return f'{dir_size} MiB'
+    if dir_size // 1024 > 0:
         dir_size = round(float(dir_size) / 1024, 1)
-        index = 0
-    return dir_size, index
-
-
-def translate_resource_index(index):
-    if index in options:
-        return options[index]
-    else:
-        logger.error("Wrong memory unit index: {} ".format(index))
-        return ''
+        return f'{dir_size} KiB'
+    return f'{dir_size} B'
diff --git a/tests/golem/task/test_taskserver.py b/tests/golem/task/test_taskserver.py
index 1939416625..7070684a24 100644
--- a/tests/golem/task/test_taskserver.py
+++ b/tests/golem/task/test_taskserver.py
@@ -471,8 +471,8 @@ def test_should_accept_provider_insufficient_memory_size(self, *_args):
             _assert_log_msg(
                 cm,
                 f'INFO:{logger.name}:insufficient provider memory size: '
-                f'{estimated_memory} B < {DEFAULT_MAX_MEMORY_SIZE_KB} '
-                f'KiB; {ids}')
+                f'4.0 KiB < 4.0 KiB; Free at least 1 B;'
+                f' {ids}')
 
         listener.assert_called_once_with(
             sender=ANY,