These calculators are free to use, need no account, and come with one important limit: they are educational tools, not professional advice. Read the section on accuracy before acting on a result that matters.
What this site offers
fastcalco.com provides free online calculators and developer utilities. There is nothing to install, nothing to buy and no account to create. You may use the tools for personal or commercial purposes without asking permission.
Accuracy, and what these tools are not
Calculators are simplified models. They apply a formula to the numbers you supply, and a formula cannot know your circumstances. Treat every result as a starting point for a conversation with a qualified person, not as the answer.
- Health and fitness tools — BMI, calorie targets, heart rate, ovulation and pregnancy dates — do not diagnose anything and do not replace a doctor or midwife.
- Financial and tax tools produce estimates. Real offers depend on your credit history, the lender's margin, fees and current rates, none of which these tools can see.
- Several tools encode Polish law specifically — VAT rates, family benefits, social contributions. Where that is the case the page says so. Rules change, and a calculator can lag behind a change in the law.
- Currency conversion uses approximate stored rates for rough orientation, not live market rates. Never use it to price a transaction.
Corrections are welcome and acted on. If a calculator gives a result you believe is wrong, write to contact@fastcalco.com with the inputs you used and what you expected.
Acceptable use
Use the site in ways that do not degrade it for other people. Specifically: do not attempt to disrupt or overload the service, do not scrape it at a rate that resembles an attack, and do not republish the guide text wholesale as your own.
Content and ownership
The explanatory text, page structure and code of this site belong to its author. Results you compute are yours — there is no claim over the numbers you produce, and no attribution is required when you use them.
Short quotations with a link back are fine. Wholesale duplication of the guides is not.
Advertising and external links
The site is funded by advertising and links out to official sources — tax offices, legal gazettes, statistical agencies. Advertisements are selected by an advertising network, not by the author, and their presence is not an endorsement. External sites have their own terms and privacy practices.
Liability
The site is provided as-is, without warranty of any kind. To the extent permitted by law, the author is not liable for loss arising from reliance on a calculated result. This does not limit any liability that cannot lawfully be limited, and it does not affect your statutory rights as a consumer.
Governing law and contact
These terms are governed by Polish law. Nothing here deprives a consumer of the protection of mandatory rules in their own country of residence. Questions go to contact@fastcalco.com.
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