Finance, health, math, time and developer tools, all free with no signup. Tax and benefit figures follow official 2026 data.
CalculatorsHub is a free collection of 169 calculators, converters and generators in seven categories, written for US users: US tax rules, US units first, dollar amounts. Every tool runs in your browser with no account, and every tool page shows its sources and a Last updated date.
Most calculator sites are built once and forgotten. Here, tax brackets, benefit amounts, loan limits and conversion factors are checked against the agencies and standards that publish them, and a page is re-dated whenever one of its figures changes.
The tools here also go deeper than single-number outputs. The mortgage calculator gives you a full amortization schedule and total cost breakdown. The paycheck calculator covers federal income tax, Social Security, Medicare and a state income tax estimate. The BMI calculator shows the adult categories used by the CDC and WHO. The currency converter uses the European Central Bank's daily reference rates. The budget calculator has a 50/30/20 rule analyzer and savings goal tracker built in.
No account required. No paywalls. No ads that block the tool, and none at all on this homepage. Every calculator is free, works on any device, and gives you results in seconds.
Each tool page ends with a short Method and sources note naming the formula and the official sources behind it, and shows a Last updated line with the date its figures were last checked. Tax figures are refreshed when the IRS publishes the next year's numbers, usually in the fall, and again when a law or agency changes a figure during the year.
| Category | Tools | Figures and formulas come from |
|---|---|---|
| Finance & Tax | 41 | IRS, SSA, CMS (Medicare), FHFA and Freddie Mac (loans), BLS (inflation) |
| Health & Fitness | 24 | CDC, NIH, WHO and the published formulas each tool names (for example Mifflin-St Jeor) |
| Math | 25 | Standard formulas; no yearly figures involved |
| Time & Date | 18 | Your browser's built-in time zone database (IANA); Wikipedia for This Day in History |
| Dev Tools | 21 | The published standards for each format (JSON, Base64, UUID, hashes, cron) |
| Fun | 30 | Published averages and NASA planet data where numbers are involved; results are for fun |
| Converters | 12 | Exact NIST conversion factors; European Central Bank reference rates for currency |
That is 171 tool pages. Two tools sit in two categories each (the Unix timestamp converter in Time and Dev Tools, and What If I Invested in Finance and Fun), so there are 169 distinct tools.
A calculator applies a published formula to the numbers you give it. It cannot see the rest of your situation: other income, credits you qualify for, your lender's rules, your employer's plan or your medical history. Use the results to plan, compare and check your own math, then confirm anything important with the IRS, your lender, your plan administrator or your doctor. The disclaimer covers financial, tax and health estimates in more detail.
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