What uptime actually means
Uptime is the percentage of time your site is available. The math most people miss:
| Uptime | Downtime per year | | --- | --- | | 99.9% | ~8.7 hours | | 99.95% | ~4.4 hours | | 99.98% | ~1.8 hours | | 99.99% | ~53 minutes | | 100% | Perfect (rare) |
Every "9" sounds the same but is 10x the reliability. A 99.9% guarantee means your store can be down for nearly nine hours a year — for an ecommerce site, that's real revenue. Our tests log actual uptime for every host on the benchmarks page.
Why hosts quote the numbers
Most hosts advertise 99.9% uptime because it's the industry baseline and easy to defend. A few things to know:
- Guarantees aren't reality — the SLA is what they'll compensate you for, not what you'll experience. Kinsta guarantees 100% (credits if exceeded); most others cap at 99.9%
- Maintenance windows are usually excluded
- "Unlimited" plans still have resource caps — oversold servers cause the "site up but loading for 30 seconds" failure that uptime monitors miss
The number to care about isn't the advertised guarantee — it's the measured uptime from real monitoring. That's what our provider reviews and the best WordPress hosting rankings use.
Which hosts measured best in our tests
| Host | Measured uptime | Guarantee | | --- | --- | --- | | Kinsta | 100% | 100% SLA | | Hostinger | 99.99% | 99.9% | | Cloudways | 99.99% | 99.9% | | WP Engine | 99.99% | 99.9% | | SiteGround | 99.98% | 99.9% |
Managed hosts (Kinsta, Cloudways, WP Engine) post the strongest records because infrastructure is monitored and mitigated 24/7. Budget hosts vary more — that's where cheap WordPress hosting picks the reliable outliers.
How to monitor your uptime
Your host's word isn't proof — set up independent monitoring:
- UptimeRobot — free, checks every minute, email/SMS alerts
- Pingdom / Better Stack — richer reports and status pages
- Host-integrated — Kinsta and Cloudways include uptime alerts
Good practice:
- Monitor at least two locations (your audience's regions)
- Alert on load time too — a site that responds in 30s is down in practice
- Log downtime history — this is the evidence if you ever claim an SLA credit
- Tie monitoring into your maintenance routine
If you care about uptime
- Buy managed hosting — 99.99%+ is typical. See managed WordPress hosting
- Choose a host with a strong SLA — Kinsta's 100% guarantee is the only one we've seen genuinely honored
- Spread your risk — a CDN (see WordPress CDN) keeps cached pages serving even during short origin blips
- Have backups — if your host dies, recovery matters more than the last 9. Backup guide
Frequently asked questions
Is 99.9% uptime good for WordPress? It's the baseline — about 8.7 hours of downtime a year. For a business site, aim for hosts that measure 99.98%+ in practice.
What does a 100% uptime SLA mean? Kinsta's guarantee: if your site drops below 100%, you get credit. It's the strongest SLA in the industry and they honor it. See the Kinsta review.
How do I check my host's real uptime? Run UptimeRobot or Better Stack for 30 days. One-month data beats a five-year guarantee.
Do shared hosts have worse uptime than managed? On average, yes — oversold servers and less infrastructure redundancy. But quality shared hosts (Hostinger, SiteGround) still measured 99.98–99.99% in our tests.
What is the best WordPress hosting for uptime? Kinsta (100% SLA), then Cloudways and WP Engine (99.99%+). For budget, Hostinger and SiteGround measured best. Rankings: best WordPress hosting.