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    QHSEtech
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    QHSE Calculators

    Free calculators for common QHSE numbers: the cost of an incident, a software ROI scenario, a compliance fine scenario from your own amounts, incident rates, ISO 45001 self-assessment, a selected-source emissions subtotal, and exposure estimates for daily noise, hand-arm vibration and a two-handed lift (the NIOSH lifting equation), plus process capability indices from your measurements. Each tool page states its inputs and assumptions; the results are estimates, not audited figures or measurements. No tool asks for an email address, and nothing you enter is stored or sent.

    Cost-of-Incident Calculator

    Build an incident-cost scenario from your own direct and additional costs in USD. Enter each cost once and record the assumptions behind your figures.

    Your direct and additional costs · print, CSV, opt-in link
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    QHSE Software ROI Calculator

    Build an ROI scenario from your own labour costs, time savings, implementation costs and rollout delay, and compare it with three worked examples.

    Your inputs · three worked examples · CSV export
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    Compliance Fine Scenario Calculator

    Calculate a cost scenario from your own amounts. No preset legal penalties or assumed software savings.

    Your own amounts only · print, CSV, opt-in link
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    TRIR / LTIFR / DART Calculator

    Calculate incident rates from your hours worked and case counts, and compare them with the BLS industry benchmarks the calculator cites.

    TRIR · LTIR and LTIFR · DART · print, CSV, link
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    ISO 45001 Readiness Assessment

    Rate your own implementation against 25 editorial questions related to ISO 45001:2018 with Amendment 1:2024, with a score for each clause group. The result is not a certification prediction or independent assessment.

    25 questions · print, CSV, link
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    Carbon Footprint Quick Calc (Scope 1+2)

    Calculate a subtotal for selected fuel and electricity sources using your quantities and emission factors. Record each factor's source, units, geography and year.

    Selected-source emissions subtotal · print, CSV, link
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    Daily Noise Exposure Calculator

    Enter task levels and durations to get the EU and GB daily exposure LEX,8h next to the OSHA noise dose and 8-hour TWA, each compared with its own action values and limits.

    LEX,8h · OSHA dose and TWA · print, CSV, link
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    Hand-Arm Vibration Exposure Calculator

    Enter each tool's vibration magnitude and trigger time to get partial and daily A(8), HSE exposure points and the time to reach 2.5 and 5 m/s² A(8). Optional whole-body A(8).

    A(8) · exposure points · print, CSV, link
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    NIOSH Lifting Equation Calculator

    Work out the Recommended Weight Limit and Lifting Index for one two-handed lift from NIOSH's Applications Manual, with each multiplier shown, in kg/cm or lb/in.

    Six multipliers · RWL and LI · print, CSV, link
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    Process Capability Calculator

    Paste measurements, or enter a mean and standard deviation, with one or both specification limits to get Cp, Cpk, Pp and Ppk and the estimated fraction outside each limit.

    Cp, Cpk, Pp, Ppk · stability screen · print, CSV, link
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    Templates to use with the calculators

    Which tool answers which question

    The tools split into five kinds: rates and footprints computed from your records, cost scenarios built from your assumptions, a self-rating against a standard, exposure estimates that apply a published formula to measured or typical values, and capability indices from measurements of a process. The kind decides what to gather first and how far to trust the result. The first tree covers the first three kinds, the second the exposure and capability tools.

    Choosing a calculatorThree questions sort a question about your records, costs or readiness into the injury-rate, emissions subtotal, incident cost, compliance fine scenario, software ROI or ISO 45001 readiness tool.A rate or total fromrecordsA cost or budgetscenarioHow ready a systemisInjury ratesFuel and electricityEvents that happenedA penaltyA software purchaseQ1What do youwant to workout?Q2Injuries andillness, oremissions?Outcome 1TRIR, LTIFRand DARTCases and hoursworked.Outcome 2EmissionssubtotalQuantities andyour factors.Q3Which cost isthe question?Outcome 3Incident costYour direct andadditional costs.Outcome 4Compliancefine scenarioYour own amountsonly.Outcome 5Software ROILabour, costs androllout delay.Outcome 6ISO 45001readinessA self-rating,not anassessment.
    Follow the branch that matches your question. Each tool is also listed with a link under the figures.
    Text version of this decision tree
    1. Q1. What do you want to work out?
      • A rate or total from records: go to Q2 (Injuries and illness, or emissions?).
      • A cost or budget scenario: go to Q3 (Which cost is the question?).
      • How ready a system is: go to Outcome 6 (ISO 45001 readiness).
    2. Q2. Injuries and illness, or emissions?
      • Injury rates: go to Outcome 1 (TRIR, LTIFR and DART).
      • Fuel and electricity: go to Outcome 2 (Emissions subtotal).
    3. Outcome 1. TRIR, LTIFR and DART. Cases and hours worked.
    4. Outcome 2. Emissions subtotal. Quantities and your factors.
    5. Q3. Which cost is the question?
      • Events that happened: go to Outcome 3 (Incident cost).
      • A penalty: go to Outcome 4 (Compliance fine scenario).
      • A software purchase: go to Outcome 5 (Software ROI).
    6. Outcome 3. Incident cost. Your direct and additional costs.
    7. Outcome 4. Compliance fine scenario. Your own amounts only.
    8. Outcome 5. Software ROI. Labour, costs and rollout delay.
    9. Outcome 6. ISO 45001 readiness. A self-rating, not an assessment.

    For an exposure at work or a process measured against its specification, the second tree sorts the three exposure tools by what the worker is exposed to or does, and sends a process question to the capability calculator.

    Choosing an exposure or capability calculatorTwo questions sort a worker's exposure or a process measured against its specification limits into the daily noise exposure, hand-arm vibration, NIOSH lifting equation or process capability tool.A worker's exposureA process againstits limitsNoiseVibration from toolsA two-handed liftQ1What are youchecking?Q2Which exposureor task?Outcome 1Daily noiseexposureTask levels anddurations.Outcome 2Hand-armvibration A(8)Magnitudes andtrigger times.Outcome 3NIOSH liftingequationOne lift'sdistances, angleand rate.Outcome 4ProcesscapabilityMeasurements or amean and SD.
    Follow the branch that matches the exposure or the process. Each tool is also listed with a link under the figures.
    Text version of the exposure and capability decision tree
    1. Q1. What are you checking?
      • A worker's exposure: go to Q2 (Which exposure or task?).
      • A process against its limits: go to Outcome 4 (Process capability).
    2. Q2. Which exposure or task?
      • Noise: go to Outcome 1 (Daily noise exposure).
      • Vibration from tools: go to Outcome 2 (Hand-arm vibration A(8)).
      • A two-handed lift: go to Outcome 3 (NIOSH lifting equation).
    3. Outcome 1. Daily noise exposure. Task levels and durations.
    4. Outcome 2. Hand-arm vibration A(8). Magnitudes and trigger times.
    5. Outcome 3. NIOSH lifting equation. One lift's distances, angle and rate.
    6. Outcome 4. Process capability. Measurements or a mean and SD.

    What each formula does

    Each tool page sets out its steps, worked examples and its limits. The cost, rate and emissions examples use invented figures; the exposure and capability tools work through examples published by OSHA, HSE, NIOSH or NIST. In one line each:

    • Incident cost. The incident count is multiplied by the direct cost plus the additional cost per incident. Nothing else is added.
    • Compliance fine scenario. The item count is multiplied by your amount per item, and one lump sum of additional costs is added once. No penalty schedule is built in.
    • Software ROI. Released hours are multiplied by an hourly cost and by the share you expect to turn into cash, then set against subscription, operating and one-off costs, with benefits starting after a rollout delay.
    • TRIR, LTIR, LTIFR and DART. TRIR, DART and LTIR are 200,000 times a case count, over the hours worked; LTIFR uses 1,000,000 instead, the base IOGP uses. TRIR counts recordable cases, LTIR and LTIFR days-away cases, and DART days-away plus restricted-only cases.
    • Scope 1 and 2 subtotal. Each quantity you enter is multiplied by the emission factor you enter, divided by 1,000 to give tonnes, and the selected sources are added.
    • ISO 45001 readiness. You score each of 25 editorial questions from 0 to 4, so the maximum is 100 points. Points are totalled out of 100 and shown as an overall percentage, with percentages by clause group beside it. It is a self-rating and does not assess conformity.
    • Daily noise exposure. EU and GB: each task's hours over 8, times 10^(level/10), are summed and LEX,8h is 10 log10 of the sum. OSHA: each task's hours are divided by its reference duration, 8 ÷ 2^((level − 90)/5) hours; the dose is 100 times the sum, and TWA = 16.61 log10(dose/100) + 90.
    • Hand-arm vibration. Each tool's partial exposure is its magnitude times the square root of its trigger time over 8 hours; the daily A(8) is the square root of the sum of the squared partials. Exposure points are 100 × (A(8) ÷ 2.5)², our derivation from HSE's 100- and 400-point values.
    • NIOSH lifting equation. The Recommended Weight Limit is the load constant (23 kg or 51 lb) times six multipliers for horizontal and vertical position, travel distance, asymmetry, frequency and coupling; the Lifting Index is the load divided by that limit.
    • Process capability. Cp is the tolerance divided by six standard deviations and Cpk the distance from the mean to the nearer limit divided by three standard deviations; Pp and Ppk use the overall standard deviation in place of the within-subgroup one. The fraction outside each limit comes from a normal distribution.

    How the calculators are made and checked

    • Sources read on a date. Where a formula or a value comes from outside, such as a regulation, a regulator's guidance or manual, a statistics agency or a technical handbook, the tool page names the source and the date it was opened. The exposure and capability tools also list what could not be read or verified. The cost tools hold no outside figures; they work only with your amounts.
    • Formulas in tested code. Each calculator's arithmetic is a separate function with automated tests, and the page shows what that function returns. The readiness self-rating is a total of your ratings, checked through its page's tests.
    • Worked examples from the sources as tests. Where a source publishes a worked example, a test reproduces it: BLS's incidence-rate example (7 cases in 400,000 hours give 3.5), OSHA's machine-shop noise day (dose 87.5%, TWA 89.0 dBA), HSE's 30-minute usage limit for a tool at about 10 m/s² (2.5 m/s² A(8), the action value), Examples 1 to 5 of NIOSH's Applications Manual and the NIST/SEMATECH e-Handbook's capability example (Cp 1.0, Cpk 0.67). Where a printed figure differs from the formula, the tool page says so.
    • Results labelled as estimates. Each result is presented as an estimate, a scenario or a self-rating built from your inputs, and each tool page says what it is not: none is a measurement, an audit finding, legal advice or a forecast.
    • Nothing stored or sent. The tools calculate in your browser and ask for no email address. A copied result link carries numbers only; on the incident-cost and compliance fine tools it stays off until you tick a box.
    • Checked by us, not by an outside specialist. The checks above are our own. No occupational hygienist, ergonomist, statistician or other outside specialist has reviewed the tools.

    Before you enter any number

    • Fix the period and the scope first, such as one calendar year and one site, and keep every input to that period and scope.
    • Take hours, counts and costs from payroll, incident registers or finance records, and write down the source and date of each.
    • Decide in advance how you classify borderline cases, such as first aid against medical treatment, so that the count is repeatable.
    • Enter each cost once. If two figures might overlap, remove the overlap before entering either.
    • Use one currency throughout and enter each quantity in the unit its field shows. The cost tools convert no currency.
    • Keep the inputs with the result. A total without its inputs cannot be checked or repeated.

    Mistakes when reading a result

    Reading a scenario as a forecast

    The cost, fine and ROI tools add what you enter. A total shows the consequence of your assumptions, not a prediction of what will happen.

    Comparing with a benchmark that does not match

    A published rate covers a defined population and year. Check that your industry, size, country and period are comparable before reading a gap as good or bad.

    Trusting a rate built on few hours

    With a small workforce a single case moves a rate by a large step. Look at several years, or at the counts alongside the rate.

    Entering a factor you cannot cite

    An emissions subtotal is only as sound as its factors. Record the source, year and geography of each, and leave a quantity at zero only for a source you have deliberately left out.

    Citing the result without its assumptions

    If you quote a figure in a report or presentation, state the inputs and the tool's limits next to it, so a reader can see what it rests on.

    Using a self-rating as an audit finding

    A readiness assessment shows how you rated yourself. It is not an independent assessment and does not predict a certification outcome.

    Treating an exposure estimate as a measurement

    The noise, vibration and lifting tools apply published formulas to the values you enter. A typical tool value or an estimated level is not a measurement of your work, and the result does not replace an assessment by a competent person.

    Reference tools

    Certification Finder

    Pick a standard, such as ISO 45001, ISO 14001, ISO 9001 or CSRD, and list the catalog entries tagged for it, alphabetically. A tag does not establish that a product supports certification; confirm it in a demo.

    Open tool

    QHSE Statistics

    Sourced figures on workplace safety and an EHS software market forecast, each linked to its publisher, with the data period, population and corrections to check before citing.

    Open tool
    Background reading:TRIR/LTIR guide →·ISO 45001 cost guide →

    Need a tool that isn't here? Tell Dimitris Mitsios (editor).

    Embed a calculator on your website

    The software ROI calculator and a shorter ISO 45001 readiness checker are also available as embeddable widgets, with copy-ready code and attribution guidance.

    View embeddable widgets

    Need software that fits your numbers?

    Take the Get Matched quiz: three questions, up to five profiles matched on your priority, industry and team-size tags.

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    Frequently Asked Questions

    Are these calculators free?
    Yes. The calculators run in your browser, show results without signup and ask for no email address. Nothing you enter is stored or sent.
    Where do the benchmarks come from?
    Each tool page names the sources and assumptions it uses. Where you have your own figures, such as hours worked, case counts, costs or fuel and electricity use, enter them instead; the compliance fine calculator uses only the amounts you provide.
    Can I get a report I can share?
    Yes. Every tool except the ROI calculator can print its result or save it as PDF, download a CSV that repeats the inputs, assumptions and sources next to the results, and copy a result link with a one-line citation. A link carries numbers only. On the incident-cost and compliance fine tools it stays off until you tick a box, because it carries your cost figures, and from pasted measurements the process capability link carries their mean, standard deviations and count, not the values. The ROI calculator exports its scenario as CSV and prints it.
    Which calculator should I start with?
    Start from the question. A rate or footprint from your own records needs the incident-rate or emissions tool; a cost question needs the incident cost, fine scenario or ROI tool; a readiness self-rating needs the ISO 45001 assessment. A worker's exposure to noise, vibration from tools or a two-handed lift needs the matching exposure tool, and whether a stable process fits its specification limits is a question for the process capability calculator. The two decision trees above follow that order.
    Do any of the tools predict a result?
    No. The cost, fine and ROI tools add or multiply the numbers you enter, the rate tool applies a published formula to your counts, the exposure tools apply published formulas to the levels, magnitudes, times and distances you enter, the capability tool applies published formulas to your measurements or summary figures, and the readiness tool totals your self-ratings. None forecasts incidents, ill health, penalties, savings or an audit outcome, and the fraction outside a specification limit is what a normal distribution would give, not a count of defects.
    Why do the cost tools start with no preset figures?
    Published averages come from a different population, period and method from your own. Entering your own costs, with a source and a date, makes the result checkable, and a preset figure would not be.
    Can I cite a result?
    Yes. The tools are free to use and to cite. A copied result link comes with a citation line naming the tool, its method and the date. If you use a result in a report, article or presentation, credit The QHSE Standard with a link, and state the inputs and assumptions behind it.