incident rates · Free · Open Source · MIT

LTIR Calculator

OSHA Lost Time Incident Rate. Based on OSHA 29 CFR 1904.7(b)(3). Results shown with the full formula so you can verify. Zero signup, zero tracking, zero data sent to a server — all calculation is client-side.

Inputs
LTIR Calculator result
0.8
per 200,000 hours
(2 × 200,000) ÷ 500,000
Equivalent LTIFR (1M base)
4.00
ISO 45001 / ILO international standard
Equivalent OSHA (200k base)
0.80
OSHA 29 CFR 1904.7 US standard

Industry benchmark comparison

Source: BLS 2024 SOII (derived)
Values in per 100 FTE (200,000-hour base)
Oil and gas extraction
0.4
Mining
0.7
Construction
1.3
US private industry (avg)
1.3average
Manufacturing
1.6
Healthcare
2.3
Transportation
2.2
Your value
0.8
Good — ≤ 0.5Average — ≤ 1.5High — > 1.5
Raw JSON result
{
  "rate": 0.8,
  "base": 200000,
  "formula": "(2 × 200,000) ÷ 500,000"
}
Overview

About the LTIR Calculator

LTIR (Lost Time Incident Rate) counts only recordable cases where the worker lost at least one day away from work. It's a subset of TRIR focused on severity — per OSHA 29 CFR 1904.7(b)(3) with a 200,000-hour base. US all-industry average is approximately 1.3 per 100 FTE (BLS 2024). Used by Aramco, ADNOC, and many US clients as a prequalification filter since it filters out the medical-treatment-only noise that can inflate TRIR.

The calculator also displays the equivalent LTIFR (1,000,000-hour base — ISO 45001 / IOGP convention) so you can report to both US and international audiences from a single input.

Formula
LTIR = (Lost Time Incidents × 200,000) ÷ Hours Worked
Regulation

OSHA 29 CFR 1904.7(b)(3)

How to use

Step-by-step: using the LTIR Calculator

  1. 1
    Count lost-time incidents — recordable cases with one or more days away from work (NOT restricted work or job transfer, just days away).
  2. 2
    Sum total hours worked during the reporting period.
  3. 3
    The calculator shows both LTIR (200k base) and the equivalent LTIFR (1M base) so you can report either.
Worked examples

LTIR Calculator — real-world examples

Typical mid-size contractor

200 workers × 2000 hours = 400,000 total hours. 2 lost-time incidents. LTIR = (2 × 200,000) ÷ 400,000 = 1.0. Equivalent LTIFR (1M base) = 5.0. Both world-class.

Who uses this calculator

Used by safety professionals worldwide

Watch out for

Common mistakes when calculating ltir calculator

FAQ

Frequently asked questions

What is LTIR?+

Lost Time Incident Rate — cases with days away from work per 100 full-time-equivalent workers (OSHA 200,000-hour base).

LTIR vs LTIFR?+

Same scope (lost-time injuries) but different base. LTIR uses 200,000 hours (OSHA); LTIFR uses 1,000,000 hours (ILO/ISO). LTIFR ≈ LTIR × 5.

Regulation citations

Authoritative sources

Related calculators

More free HSE calculators

TRIR Calculator
OSHA Total Recordable Incident Rate
LTIFR Calculator
ISO/ILO Lost Time Injury Frequency Rate
DART Rate Calculator
OSHA Days Away, Restricted, Transferred rate
Severity Rate Calculator
Days lost per exposure base

Embed this calculator

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="ltir-calculator"></script>
Optional attributes: data-theme, data-width, data-min-height. Works on any CMS (WordPress, Webflow, Ghost, plain HTML).
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