What is ProReckoner?
ProReckoner is a collection of 153 free professional calculators built for nurses, paramedics, pharmacists, tradies, hospitality workers, fitness trainers, farmers, finance professionals, teachers, real estate investors and construction workers.
Every calculator is built around the actual formulas and workflows used daily on the job — not simplified approximations. Whether you are calculating a drug dose mid-shift, estimating a build cost for a quote, working out rental yield on an investment, or scaling a recipe for a function, ProReckoner gives you a fast, accurate answer without sign-up, without ads, and without installing anything.
The site works on any device and supports both metric and imperial units, with AU and US-specific modes on the Finance, Real Estate and Construction pages.
Our 11 professions — 153 free tools
Our principles
- Always freeEvery calculator on ProReckoner is free, with no sign-up, no subscription and no paywall. We believe professional tools should be accessible to everyone.
- Accurate formulasEvery tool is based on real clinical, trade or industry formulas — the same ones used by professionals every day. We cite our references in the educational sections of each calculator.
- Works on any deviceProReckoner is fully responsive. It works on phones, tablets and desktop computers. No app to install, no download required.
- AU and US supportFinance, Real Estate and Construction tools include AU and US modes with locally-relevant rates, thresholds and benchmarks. All clinical and trade calculators support both metric and imperial units.
- No tracking beyond analyticsWe use Google Analytics to understand how people use the site. We do not sell your data, show advertising, or require personal information of any kind.
Important disclaimer
ProReckoner calculators are for reference and estimation only.
Clinical calculators (nurses, paramedics, pharmacy) are decision-support tools only — they do not replace professional clinical judgement, institutional protocols, or the advice of a registered health professional. Always verify critical clinical calculations independently.
Finance, Real Estate and Construction calculators provide estimates only. Tax rates, stamp duty thresholds, building costs and lending criteria change frequently and vary by location. Always consult a licensed professional before making financial, legal or construction decisions.
Contact us
We welcome feedback, correction requests and suggestions for new calculators. If you spot an error or have an idea for a new tool, please contact us.
ProReckoner is an independent project. We are not affiliated with any healthcare institution, government body, financial institution or professional association.