Uptime Calculator

What does uptime percentage mean?

Uptime percentage measures how much time a service is operational over a given period. A 99.9% uptime SLA means the provider guarantees no more than 43 minutes and 50 seconds of downtime per month.

The difference between "nines" matters more than you'd think. Going from 99.9% to 99.99% reduces allowed downtime from ~44 minutes/month to ~4 minutes/month — a 10x improvement.

How to calculate downtime from uptime

The formula is simple:

For example, 99.9% uptime over 30 days:

What causes downtime?

• Server failures — hardware crashes, disk failures, memory issues
• Deployment errors — bad config pushes, broken builds
• Network issues — DNS propagation, routing problems, DDoS attacks
• Scaling failures — traffic spikes overwhelming resources
• Cold starts — serverless platforms spinning up from zero

Traditional hosting setups require you to manage all of this. With InstaPods, your app runs on real Linux servers with dedicated resources — no cold starts, no shared tenancy surprises.