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SLA Uptime Calculator Runs in your browser. No input data is sent to our server.

Enter an uptime percentage and instantly see how much downtime it allows across a year, month, week, and day. This page is useful for SLAs, customer commitments, vendor comparisons, and reliability planning.

Allowed downtime summary

Choose your settings and run the tool instantly.

This tool runs entirely in your browser, so you can inspect, transform, or generate developer text without sending it to a remote processing service.

Calculate Allowed Downtime From SLA Uptime Targets

Convert uptime percentages into allowed downtime for SLA planning, vendor reviews, status-page targets, and reliability communication.

How to use SLA Uptime Calculator

1

Choose the settings you want for the generated output.

2

Adjust the available options, then run the tool.

3

Copy or download the result once it looks right.

Why this helps in real workflows

You need to explain what a 99.9% or 99.99% uptime promise really means in downtime.

A vendor SLA needs a quick downtime comparison before procurement or review.

A status page, contract, or ops document needs clearer uptime numbers.

You want a fast way to sanity-check reliability targets without using a spreadsheet.

Which tool should you choose?

SLA Uptime Calculator: Choose this when you want to turn an uptime percentage into allowed downtime across common time windows.

SLO Error Budget Calculator: Choose SLO Error Budget Calculator when you want to track how much of the reliability budget has already been used.

Common problems and fixes

A percentage target feels abstract and hard to explain.

Convert it into hours, minutes, and seconds of downtime so stakeholders can understand the impact faster.

I need to compare stricter uptime targets side by side.

Try values like 99.9%, 99.95%, and 99.99% to see how sharply the allowed downtime drops.

Our monthly SLA wording is unclear.

Use the monthly window setting to match the contract or reporting period you actually use.

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Related Guides

How to Interpret 99.9% vs 99.99% Uptime What an Error Budget Means in SRE How to Use a Cron Expression Generator

Frequently asked questions

What does an SLA uptime calculator do?

It converts an uptime target such as 99.9% into the amount of downtime that target allows over common periods like a year, month, week, and day.

Can I compare 99.9% and 99.99% uptime?

Yes. Change the target percentage and the calculator updates the allowed downtime instantly.

Is this SLA uptime calculator free?

Yes. It is free to use in your browser.