Help centre
Frequently Asked Questions
Answers about Tuff Search, using the calculators, accuracy, privacy, cookies and ads.
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About Tuff Search
Tuff Search is a free calculator website. We build online calculators for finance, paycheck taxes, health, daily life, sports, construction, math, statistics, biology, food, marketing and more. Each calculator explains the formula it uses and includes a worked example.
Tuff Search is run by an independent team. See our About Us page for how we work, or email support@tuffsearch.com.
Yes. Every calculator is free and needs no account. The site is supported by advertising served by Google AdSense.
Using the calculators
No. Open any calculator, enter your numbers and get the result. There are no accounts on Tuff Search.
We have 11 categories — Finance, Health, Daily Life, Sports, Construction, Math, Statistics, Biology, Food, Marketing and Female calculators — plus US state paycheck calculators. See the All Calculators page for the full list.
Use the All Calculators page to browse by category or A–Z, or use the search box at the top of the site.
Yes. They are designed to work on phones, tablets and desktop computers.
Browse by category from the homepage, or open the All Calculators page for a list of every tool by category and A–Z.
Yes. There is a paycheck calculator for every US state and Washington, DC, using 2026 federal and state tax rules.
Yes. Every calculator is designed to work on phones, tablets and desktops.
Most calculators let you switch between metric and imperial units where it matters, such as height, weight, distance and fabric sizes.
Accuracy
Each calculator is based on a published formula or official data, such as IRS limits or state tax rates for the year shown on the page, and is tested against worked examples before publishing. Results depend on the numbers you enter and the assumptions explained on each page, so treat them as estimates. For health, tax, legal or financial decisions, confirm with a qualified professional.
We review calculators when the underlying rules change — for example new tax years, contribution limits or updated guidelines — and show a ‘last reviewed’ date on pages where figures change over time.
Email support@tuffsearch.com with the calculator name, the values you entered and the result you expected. We’ll check it and correct the page if needed, as described in our Editorial Policy.
Privacy, cookies and ads
No. Calculator inputs are processed in your browser and are not sent to our servers.
Yes. We use Google Analytics cookies to understand how the site is used, and Google AdSense cookies to show and measure ads. Visitors in regions that require it are asked for consent through a Google consent message. See our Privacy Policy for the full list and how to change your choices.
Ads keep Tuff Search free. They are served by Google AdSense. We don’t control which specific ads appear, and advertisers have no influence over our calculators or content.
Feedback
Yes — email suggestions@tuffsearch.com with the calculation you need.