Request Error Budget Calculator
Calculate request-based failure budget and remaining capacity against a target.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Eligible requests | Enter eligible requests using the definition in the method and example. |
| Observed failed requests | Enter observed failed requests using the definition in the method and example. |
| Successful request target (%) | Enter percentage units: 5 means 5%, not a fraction of 0.05. |
Understanding your result
Read Allowed failures, Remaining failure budget in the units and model stated on this page. The formula allowed = requests * (1 - target / 100) · remaining = allowed - failures defines the relationship; measurement accuracy and model applicability are separate from numerical precision.
Common mistakes
- Mixing input units or changing the physical meaning of a variable without changing the model.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Calculation checks, sources and review limits
How many failed requests can I allow before exhausting my error budget?
Calculate request-based failure budget and remaining capacity against a target.
Common uses
- How many failed requests can I allow before exhausting my error budget
How it works
allowed = requests * (1 - target / 100); remaining = allowed - failures
Worked example
Enter Eligible requests: 1000000 ; Observed failed requests: 800 ; Successful request target: 99.9 %. Results: Allowed failures: 1000 ; Remaining failure budget: 200 .