NursingCalc is a free collection of clinical calculators and reference charts for nurses, nursing students, and anyone who needs a quick, correct answer to a routine clinical calculation. No accounts, no paywalls, no sign-up. This page explains where the formulas come from, how they are checked, and what this site is and is not — because with medical reference material, how something was built matters as much as what it says.
NursingCalc is an independent reference project. It is not a hospital, a clinic, a medical provider, or a substitute for one. What it does is take clinical formulas that are already standard and published — Cockcroft-Gault, Parkland, the D/H × Q dosage method, and the rest — and make them fast to use and easy to check.
Every calculator here is a faithful implementation of a formula you can look up yourself. That's deliberate. The value on offer is speed and clarity, not novel clinical guidance, and the site is built so that anyone who wants to verify the underlying maths can do so from the citation on the page.
Every tool goes through the same process before it goes live:
Content here is built from published clinical literature and professional guidelines rather than secondary web sources. The references used most often across the site include:
Individual pages cite the specific source behind that particular formula or range.
Being clear about the limits is part of being useful:
If you think something here is wrong, please tell us. Email info@nursingcalc.com with the page address and what you believe the error is. Reports about formulas, reference ranges, and calculator output are treated as the highest priority and are checked against the primary source before anything is changed.
Corrections are genuinely welcome, including ones that turn out to be mistaken — a wrong report costs a few minutes, while an uncorrected error on a clinical reference page costs considerably more. If you are a nurse, pharmacist, or clinician and you spot something, your feedback is especially valued.
Pages are reviewed and updated as guidelines change and as the reference material is expanded. Where a page has been substantially revised, that change is reflected in the site's sitemap so search engines and readers see current material rather than stale copy.
NursingCalc is free to use and always will be. Running costs may be covered by advertising. No advertiser has any influence over which formulas are used, what the calculators output, or what the reference pages say — the clinical content is decided by the sources, full stop.
Every calculator implements a standard, published formula, and the source is cited on the page so you can check it against the original. Each tool is tested against worked examples from published references before going live. No online calculator replaces clinical judgement or your institution's protocols, so results should always be verified before they influence patient care.
NursingCalc is an independent reference project rather than a hospital, clinic, or medical provider. Its content is built around published clinical formulas and established reference ranges, with the source cited on each page. It's intended as an educational and reference tool for nurses, students, and clinicians who already know how these calculations are used.
Email info@nursingcalc.com with the page address and what you believe is wrong. Corrections to formulas or reference ranges are the highest priority and are checked against the primary source before any change is made. Every report is welcome, including ones that turn out to be mistaken.
Yes — every calculator and reference chart is free, with no account, sign-up, or subscription. Running costs may be covered by advertising, which never affects which formulas are used or what the calculators output.