99.9% uptime — the commonly cited “acceptable minimum” for a WordPress site with a real audience — actually permits about 43 minutes of downtime per month, or roughly 8.7 hours per year. For a WooCommerce store doing $1 million in annual revenue, that much downtime represents roughly $1,000 in direct lost revenue (8.7 hours is 0.1% of the year, so 0.1% of annual sales), and more if the outage lands on a sale day or your busiest hours, before counting the harder-to-quantify SEO damage, brand damage, and customer-trust erosion that compounds afterward.
What Uptime Percentages Actually Mean in Practice
| Uptime | Downtime per month | Downtime per year |
|---|---|---|
| 99% | 7 h 18 min | 3.65 days |
| 99.5% | 3 h 39 min | 1.83 days |
| 99.9% | 43.8 min | 8.77 hours |
| 99.95% | 21.9 min | 4.38 hours |
| 99.99% | 4.4 min | 52.6 min |
Typical SLA ranges and prices by hosting tier:
| Hosting tier | Typical SLA | Typical price |
|---|---|---|
| Shared/budget hosting | 99% – 99.5%, or none | $3–$10/month |
| Managed WordPress hosting | 99.9% – 99.95% | $25–$200/month |
| Cloud hosting (AWS/GCP/Azure) | 99.95% – 99.99% per service | $50–$500+/month |
An SLA is a contractual promise about how much downtime the host will compensate for, not a measurement of what you will actually get. Real-world uptime can be lower than the headline number, which is why the monitoring steps below matter.
Why SLA Credits Are Not Real Insurance
A common SLA credit structure offers 5–10% of your monthly hosting fee for each hour of downtime beyond the guarantee. On a $50/month plan, a full day of downtime might net you a $5 credit; on a $30/month plan, two hours of excess downtime nets roughly $3. Against the roughly $1,000 of lost revenue in the example above, which is only the direct cost for a real ecommerce store, this makes clear that SLA credits are a token gesture from the host, not meaningful business-interruption compensation — the actual protection has to come from choosing reliable hosting in the first place, not from what you’re owed after the fact.
What This Means for the Hosting Decision
99.95% or higher is the recommended threshold specifically for WooCommerce stores or any site where downtime directly costs revenue — the gap between 99.9% and 99.95% looks small as a percentage (0.05%) but represents roughly half the annual downtime hours (8.7 hours versus roughly 4.4), which is a meaningful difference when each hour has a real dollar cost attached for a revenue-generating site.
What to Actually Do
- Calculate your own actual downtime cost using your real average revenue per hour, not just the generic $1,000/year example — this gives you a concrete number to weigh against hosting tier cost differences.
- Choose hosting tier based on that calculation, not just the lowest advertised price — a cheaper plan with materially worse real-world uptime can cost more in lost revenue than the price difference to a more reliable tier.
- Don’t rely on SLA credits as your actual risk mitigation — treat them as a minor, mostly symbolic acknowledgment, and choose hosting reliability itself as the real protection.
- Monitor your own actual uptime independently (via a third-party monitoring service) rather than only trusting your host’s own reporting, since you want visibility into what you’re really experiencing, not just what’s claimed.
This connects to the broader hosting decision in WordPress Hosting in 2026: How to Choose the Right Plan. Want your current hosting’s real-world reliability assessed? Get in touch.
What Usually Takes a WordPress Site Down (It Is Often Not the Host)
When we look at outages on client sites, the server itself is only one cause. Just as often it is something on the site:
- A plugin or theme update that triggers a PHP fatal error (the “critical error” screen).
- An expired domain or SSL certificate: the site is up, but visitors see a warning or nothing at all.
- Running out of resources on a traffic spike, a bot crawl or a heavy cron job.
- A hacked site that the host suspends or that Google flags.
A 99.99% SLA does not cover any of these. Tested updates, renewal reminders and monitoring do.
How to Monitor Uptime Yourself
- Use an external monitor that checks your home page (and for stores, a product page) every 1–5 minutes from outside your host. Jetpack’s free downtime monitor and most uptime services offer this.
- Alert by email and phone, so a night-time outage is found in minutes, not the next morning.
- Keep a monthly record of incidents and minutes down. Compare it with your host’s SLA before you renew.
- Check that checkout works, not just that the home page loads. A store can be “up” with a broken payment step.
Don’t want to watch it yourself? Our care plan (€69/month) includes uptime and security monitoring, daily off-site backups and updates tested before they go live.
Frequently Asked Questions
Is 99.9% uptime actually good enough for a WooCommerce store?
It’s the general minimum recommendation for any active site, but for a revenue-generating WooCommerce store specifically, 99.95% or higher is the more appropriate target given how directly downtime translates to lost sales.
Do all hosts actually deliver the uptime they advertise?
Not always precisely — real-world average uptime tends to run somewhat below the advertised SLA figure across most hosting tiers, which is why independent monitoring of your own site’s actual uptime matters.
Are SLA credits worth factoring into a hosting decision?
Only marginally — the credit amounts are typically small relative to real business impact from downtime, so they shouldn’t be weighted heavily against a host’s actual track record for reliability.
Featured image: original illustration.