diff --git a/src/perf/index.ts b/src/perf/index.ts
index bb5d4aba2d..e6c43035bf 100644
--- a/src/perf/index.ts
+++ b/src/perf/index.ts
@@ -121,13 +121,13 @@ export class PerfService implements Startable {
   async measureDownloadBandwidth (peer: PeerId, size: bigint) {
     const now = Date.now()
     await this.startPerfOnStream(peer, 0n, size)
-    return (8n * size) / BigInt((Date.now() - now) / 1000)
+    return (8000n * size) / BigInt(Date.now() - now)
   }
 
   // measureUploadBandwidth returns the measured bandwidth in bit per second
   async measureUploadBandwidth (peer: PeerId, size: bigint) {
     const now = Date.now()
     await this.startPerfOnStream(peer, size, 0n)
-    return (8n * size) / BigInt((Date.now() - now) / 1000)
+    return (8000n * size) / BigInt(Date.now() - now)
   }
 }