All calculators: A–Z
Find the right tool among 778 calculators. Search by name, filter by category or jump to an A–Z section. Explore country-specific calculators for the US, India and UK.
Need a quick starting point? Try the mortgage calculator, percentage calculator, BMI calculator, or unit conversion calculator. Each tool has its own page with inputs, results and calculation guidance.
Search results appear above the alphabetical index. The A–Z listings below remain available for browsing even when you are searching.
Browse all calculators alphabetically
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US calculators (238)
India calculators (101)
UK calculators (22)
How to find the right calculator
Use the search field to find a tool by its name, such as compound interest, salary, BMI or area. Select a category to narrow your search. Alternatively, use the letter navigation to jump directly to a section of the complete directory. The country collections group tools designed for particular tax systems, measurement conventions and financial contexts.
Which category should I choose?
- Financial: loans, savings, mortgages, investments, interest and budgeting.
- Maths: percentages, fractions, algebra, geometry and statistics.
- Health: general wellness estimates, body measurements and nutrition planning. These are not medical diagnoses.
- Conversion: unit conversions, sizes and measurement calculations.
- Everyday: dates, time, fuel, household planning and practical tasks.
- Engineering: physical quantities, materials and technical formulas.
- Other: utilities and specialised tools.
Country-specific calculators
US calculators cover topics such as federal and state tax, paychecks and mortgages. India calculators cover local financial and property calculations. UK calculators include salary, PAYE, property tax and VAT tools. Check the date and assumptions on each tool page, particularly for tax and legal calculations.
Frequently asked questions
Are the calculators free?
Yes. The directory links to free tools available on CalculatorsOnline. Some tools may depend on browser features such as JavaScript.
How do I search for a calculator?
Enter a relevant word in the search box and, if useful, choose a category. You can also browse the complete A–Z listing without using search.
Why are there different US, India and UK calculators?
Tax systems, financial terminology, regulations and measurement practices differ by country. Country-specific pages explain the assumptions relevant to their calculations.
Are financial and health results exact?
Results are estimates based on the inputs and methods stated on each calculator page. Check official sources or qualified professionals for important decisions.
For information about how tools and guidance are maintained, read our editorial policy. You can also contact us about a missing or incorrect calculator link.