Clear, checkable results
We show how results are calculated so you can verify them.
About us
About Tuff Search
Tuff Search is a free calculator website. We build online calculators that help people make everyday decisions with numbers — what a paycheck will look like after tax, how much a 401(k) could grow, how many calories you burn in a day, or how much asphalt a driveway needs.
Each calculator comes with an explanation of the formula behind it, a worked example and notes on its limits, so you can understand the result rather than just copy it.
Free, no sign-upFunded by advertising
Formula + worked exampleOn every calculator page
About the team
Who runs Tuff Search
Tuff Search is an independent calculator website, launched in April 2026. We don’t publish a postal address — the quickest way to reach the team is by email at support@tuffsearch.com.
11 categories + 51 paycheck calculators
What we offer
Tuff Search has calculators in 11 categories, plus paycheck calculators for all 50 states and Washington, DC. We add new calculators regularly. Every new tool goes through the same checks before it is published (see below).
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Finance Calculators
401(k) growth, effective annual rate, basis points
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Paycheck Calculators
State-by-state take-home pay for 2026
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Health Calculators
Daily calories, fat and nutrient needs, keto macros
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Daily Life Calculators
Engine compression ratio, RPM, wheel offset, crosswind
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Sports Calculators
Bench press 1RM, dunk height, bike size and pace
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Construction Calculators
Estimate asphalt tonnage, volume and cost for driveways
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Math Calculators
Rounding, percent error, radicals, midpoint, synthetic division
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Statistics Calculators
Normal and binomial distributions, dice probability
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Biology Calculators
Dog and cat pregnancy due dates, dog heat cycles, cow gestation
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Food Calculators
Coffee brew ratios, sourdough hydration
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Marketing Calculators
Facebook, LinkedIn, TikTok and YouTube ad budgets, ROAS
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Female Calculators
Period and ovulation dates, hair growth timelines, ring sizes
Tested before it goes liveEach calculator is checked against independently worked examples.
Our process
How we build and check our calculators
- We start from a published formula or official data source — for example IRS contribution limits, state revenue department tax tables or peer-reviewed equations such as Mifflin-St Jeor.
- Each calculator is tested against independently worked examples before it goes live.
- Health, tax and finance calculators show the year or date their figures apply to, and the sources they rely on.
- When rates or rules change (for example new tax years), we update the affected calculators and the page’s review date.
- If you find an error, we investigate it and correct the page. Our Editorial Policy describes this process in full.
What we stand for
Our principles
The same four rules apply to every calculator and guide we publish.
Free and without sign-up
All calculators are free to use and need no account. The site is funded by advertising served by Google AdSense; advertisers do not influence our calculators or content.
Privacy by design
Calculator inputs are processed in your browser and are not sent to our servers. Our Privacy Policy explains the cookies used for analytics and advertising.
Privacy PolicyNot a substitute for professional advice
Our calculators give estimates for information and education. For decisions about your health, money, taxes or safety, speak to a qualified professional.
See our DisclaimerContact us
Questions, corrections or ideas for new calculators are welcome. Visit the Contact Us page or email support@tuffsearch.com.