Calculators Tools
(17)Everyday calculators that run in your browser — work out age and Javanese weton, convert units, and calculate mortgage, zakat and THR. Every calculation happens on your device.
Roman Numeral Converter Convert numbers to Roman numerals and back (1–3999) Percentage Calculator Percentages, tips and discounts — split a bill, % off & change Countdown Timer Count down to a date — days, hours, minutes & seconds left Stopwatch, Timer & Alarm Online stopwatch, countdown timer and alarm clock Time Zone Converter Convert times across zones & plan meetings across regions Age & Weton Calculator Work out an exact age plus your Javanese weton and neptu Unit Converter Convert length, mass, temperature, volume, speed and more Pomodoro Timer A configurable Pomodoro focus timer with breaks Typing Speed Test Measure your typing speed (WPM) and accuracy BMI Calculator Calculate your Body Mass Index and healthy weight range Calorie / TDEE Calculator Estimate daily calories (BMR & TDEE) for your goals GPA Calculator Compute your weighted GPA on a 4.0 scale Date Duration Calculator Days between two dates, or add/subtract days Scientific Calculator Scientific calculator with functions, powers & constants KPR / Mortgage Calculator Calculate monthly home-loan installments and amortisation Zakat Calculator Calculate zakat maal and zakat penghasilan (2.5%) THR Calculator Calculate THR (holiday allowance), full or prorated
Frequently asked questions
Are my numbers uploaded to a server?
No. Every Calculators tool on PDFPowerHub runs in your browser — calculating age and weton, converting units and working out finances all happen on your device, so your numbers never leave it.
Do I need to install anything or create an account?
No install and no sign-up. Open the page and use any tool instantly — no limits and no watermarks.
Do these Calculators tools work offline?
Yes. PDFPowerHub is a PWA, so once loaded the tools keep working with no internet connection.
Are these Calculators tools free?
Yes — every tool in the Calculators category is completely free, with no limits or watermarks.