Source: https://guthlabs.ai/docs/instruments/uptime-sla-availability-calculator/implementation/

instrument implementation / implementation-contract

# Uptime / SLA Availability Calculator implementation

A source-bound implementation contract for Uptime / SLA Availability Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t5-048

**Effect**: Computation or source lookup only

## Input and validation requirements

The reverse-calculation path accepts a zero-length period mathematically presented as an input, producing an undefined division unless it rejects the input. The annual calculation also has a convention-sensitive result when the meaning of year is not specified.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "mode": "allowed_downtime",
    "availability_percent": 99.9,
    "period_days": 365
  },
  "expected_outputs": {
    "availability_fraction": 0.999,
    "allowed_downtime_days": 0.365,
    "allowed_downtime_hours": 8.76,
    "allowed_downtime_minutes": 525.6
  },
  "working": "1. Convert percentage: 99.9% / 100 = 0.999. 2. Compute unavailable fraction: 1 - 0.999 = 0.001. 3. Compute downtime: 365 days × 0.001 = 0.365 days. 4. Convert to hours: 0.365 × 24 = 8.76 hours. 5. Convert to minutes: 8.76 × 60 = 525.6 minutes."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/uptime-sla-availability-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/uptime-sla-availability-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/uptime-sla-availability-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche5/tranche5-results.json`