diff --git a/elstat/blueprints/api.py b/elstat/blueprints/api.py
index 16fd91e..9e7bbed 100644
--- a/elstat/blueprints/api.py
+++ b/elstat/blueprints/api.py
@@ -52,8 +52,6 @@ def get_graphs(manager):
 
 def _raw_uptime(cur, service_name: str, worker, time_period: int) -> str:
     """Calculate uptime for a service given a timeframe."""
-
-    # get total period of the last 24 hours
     max_tstamp = time.time() * 1000
     min_tstamp = max_tstamp - time_period
 
@@ -68,8 +66,8 @@ def _raw_uptime(cur, service_name: str, worker, time_period: int) -> str:
     row = cur.fetchone()
     down_hits = row[0]
 
-    # total downtime in seconds
-    downtime = down_hits * worker.service['poll']
+    # total downtime in milliseconds
+    downtime = down_hits * worker.service['poll'] * 1000
 
     # calculate total downtime in percentage
     percent = Decimal(downtime) / Decimal(t_period)