What is ProReckoner?
ProReckoner is a free collection of professional calculator tools designed for people who need fast, accurate answers on the job. Whether you're a nurse checking an IV drip rate mid-shift, a tradie estimating concrete bags on a building site, a baker scaling a recipe for a function, or a homeowner calculating mortgage repayments — ProReckoner gives you the answer in seconds.
Every calculator is built around the real formulas used in each profession. No paywalls, no accounts, no apps to download. Just open the page and calculate.
What we cover
ProReckoner currently provides 54 free calculators across four professions:
Our principles
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Fast and functionalAll calculations happen instantly in your browser. No waiting for a server. Works on any device including mobile.
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Always freeEvery calculator on ProReckoner is free to use. No subscription, no sign-up, no hidden costs — ever.
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Professionally accurateEvery formula is based on industry standards and clinical guidelines. We reference the source for every calculation so you can verify it yourself.
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Metric and ImperialAll tools support both metric and imperial units with a single toggle. Useful for professionals working across Australian and international standards.
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Private by designWe don't store any values you enter. All calculations run locally in your browser and are never transmitted to any server.
Important disclaimer
All calculators on ProReckoner are provided for reference and educational purposes only. They are not a substitute for professional medical, financial, legal or trade advice. Always verify results against current professional standards and consult a qualified professional before making clinical, financial or construction decisions. ProReckoner accepts no liability for errors or omissions.
Contact us
Have a suggestion for a new calculator, found an error, or want to get in touch? We'd love to hear from you. Visit our Contact page to send us a message.