incident rates

Severity Rate Calculator

Free severity rate calculator with both OSHA (200,000) and ISO/ILO (1,000,000) base support. Required KPI for ISO 45001 management review.

Days lost

Total hours worked

Base

Result

{
  "rate": 18,
  "base": 200000,
  "formula": "(45 × 200,000) ÷ 500,000"
}

Formula

Severity Rate = (Days Lost × Base) ÷ Hours Worked

Regulation

OSHA / ILO

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Free for any website, blog, or course — MIT / CC BY 4.0. Attribution stays visible.

<script src="https://tools.smartqhse.com/embed.js" data-calc="severity-rate-calculator"></script>

Optional attributes: data-theme, data-width, data-min-height. Works on any CMS (WordPress, Webflow, Ghost, plain HTML).

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