Guides and tips across our tools.
Learn how an age calculator works, why exact age in months and days matters for medical, legal, and insurance contexts, and how to calculate age precisely between any two dates.
Learn what NS records are, how DNS delegation works, why NS records are the first thing to check when DNS fails, and how to use a free NS lookup tool to verify nameserver configuration.
Learn how reverse DNS works, what PTR records reveal about IP addresses, why forward-confirmed reverse DNS matters for email, and how to use a free reverse DNS lookup for security and diagnostics.
Learn how a retirement calculator works, what corpus you actually need, and how inflation and longevity affect your plan — with real examples at different life stages and a free calculator to find your number.
Learn the difference between degrees, radians, gradians, arcminutes, and arcseconds, when each is used, and how to convert between them instantly with a free angle converter.
Learn how simple interest works, how it compares to compound interest, and when it's still used in loans and savings — with the formula, worked examples, and a free calculator.
Learn how income tax is calculated using progressive slabs, which deductions reduce your liability, and how to use a free tax calculator to find your exact tax amount before filing.
Learn how SIP returns are calculated, what your monthly investment actually grows to over time, and how to use a free SIP calculator to plan long-term wealth creation with real examples.
Learn how to convert between km/h, mph, m/s, and knots — with real examples for driving abroad, weather forecasts, aviation, and physics — plus a free speed converter.
Learn how to convert between Celsius, Fahrenheit, and Kelvin — why the formulas aren't simple multiplications, and real examples for cooking, weather, fever, and science — with a free temperature converter.
Learn how cron expression syntax works, what each field means, common scheduling patterns decoded, and how to use a free cron explainer to verify your schedule before deploying it.
Learn how pregnancy due dates are calculated using Naegele's Rule, what the trimester milestones are, how accurate EDD estimates really are, and how to track your pregnancy week by week.
