diff --git a/include/lorawan/lorawan.h b/include/lorawan/lorawan.h
index adda8d54b98..5cedb132dd3 100644
--- a/include/lorawan/lorawan.h
+++ b/include/lorawan/lorawan.h
@@ -205,6 +205,19 @@ void lorawan_enable_adr(bool enable);
  */
 int lorawan_set_datarate(enum lorawan_datarate dr);
 
+/**
+ * @brief Get the current payload sizes
+ *
+ * Query the current payload sizes. The maximum payload size varies with
+ * datarate, while the current payload size can be less due to MAC layer
+ * commands which are inserted into uplink packets.
+ *
+ * @param max_next_payload_size Maximum payload size for the next transmission
+ * @param max_payload_size Maximum payload size for this datarate
+ */
+void lorawan_get_payload_sizes(uint8_t *max_next_payload_size,
+			       uint8_t *max_payload_size);
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/subsys/lorawan/lorawan.c b/subsys/lorawan/lorawan.c
index 9b7914f97d3..62ff897ce34 100644
--- a/subsys/lorawan/lorawan.c
+++ b/subsys/lorawan/lorawan.c
@@ -349,6 +349,18 @@ int lorawan_set_datarate(enum lorawan_datarate dr)
 	return 0;
 }
 
+void lorawan_get_payload_sizes(uint8_t *max_next_payload_size,
+			       uint8_t *max_payload_size)
+{
+	LoRaMacTxInfo_t txInfo;
+
+	/* QueryTxPossible cannot fail */
+	(void)LoRaMacQueryTxPossible(0, &txInfo);
+
+	*max_next_payload_size = txInfo.MaxPossibleApplicationDataSize;
+	*max_payload_size = txInfo.CurrentPossiblePayloadSize;
+}
+
 void lorawan_enable_adr(bool enable)
 {
 	MibRequestConfirm_t mib_req;