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SLO Error Budget Calculator Runs in your browser. No input data is sent to our server.

Enter an SLO target, choose a time window, and optionally add consumed downtime to see the remaining error budget instantly. This page is useful for SRE reviews, incident follow-ups, and reliability planning.

Error budget result

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 Remaining Error Budget From an SLO Target

Turn SLO percentages into total, consumed, and remaining error budget for reliability reviews, incident tracking, and operations planning.

How to use SLO Error Budget 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 want to know how much error budget remains after recent incidents.

An SRE or reliability review needs a quick budget-used percentage.

You need to explain whether a team is close to burning through its monthly SLO budget.

You want a lighter-weight alternative to maintaining a spreadsheet for basic budget math.

Which tool should you choose?

SLO Error Budget Calculator: Choose this when you need total, consumed, and remaining budget for a specific SLO window.

SLA Uptime Calculator: Choose SLA Uptime Calculator when you only need raw allowed downtime from a target percentage.

Common problems and fixes

I know the SLO target but not how much budget is left.

Enter the consumed downtime and let the calculator show total, remaining, and used percentage.

The team needs a fast incident review number.

Use the current budget window and recent downtime total to estimate how close you are to budget exhaustion.

I want to compare how strict different SLOs feel in practice.

Change the target percentage and window to see how much budget each target allows.

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Related Guides

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

Frequently asked questions

What is an error budget calculator?

It converts an SLO target into the amount of downtime you are allowed in a chosen window and shows how much remains after consumed downtime.

Can I track how much budget is left this month?

Yes. Pick a monthly window and enter the downtime already consumed to see the remaining budget.

Is this error budget calculator free?

Yes. It is free to use in your browser.