About CalcHub

CalcHub is a free online platform built to give you instant access to over 50 accurate calculators and unit converters — all in one place. Whether you're splitting a restaurant bill, calculating a mortgage payment, tracking your BMI, or checking thread plug gauge tolerances for a manufacturing job, CalcHub has a tool designed to give you a reliable answer in seconds. There is no signup, no download, and no paywall. Every calculator works right in your browser on desktop or mobile.

Our tools span five core categories. The Math section covers everyday calculations like percentages, fractions, averages, and geometry. The Finance section includes mortgage, loan, compound interest, and investment calculators to help you make informed money decisions. The Healthcategory offers BMI, BMR, calorie, body fat, and macronutrient calculators for fitness and wellness tracking. The Unit Converters section handles length, weight, temperature, speed, and currency conversions. And our Engineering & Threads category provides specialized calculators for screw plug gauge tolerances, thread specifications, and reference tables for ASME, ISO, and Helicoil STI standards.

CalcHub is built for everyone — students tackling homework, professionals verifying calculations, homeowners managing finances, fitness enthusiasts tracking goals, and engineers working with precision measurements. Each tool includes the underlying formula, a plain-English explanation of how it works, and relevant reference data so you not only get an answer but understand the math behind it.

CalcHub is independently built and maintained by a small team passionate about making practical computation accessible to everyone. The site is supported entirely by advertising and optional donations from users who find the tools valuable — no data is sold, no accounts are required, and your calculations stay private in your browser. We are continuously adding new calculators based on user requests, so if there's a tool you need that we don't have yet, let us know.