Calculator X

Calculator X is a precision calculator built for people who need exact answers, not rounded guesses.

EXACT MATH, NO SHORTCUTS
Most calculator apps quietly round your results and hide the error. Calculator X computes exact fractions and shows you the true value — no floating-point mistakes, no hidden rounding.

POWERFUL CONVERSIONS
Convert length, mass, time, temperature, area, volume, speed, and digital storage (with both decimal KB and binary KiB handled correctly — they're not the same thing). Built-in number base converter for hexadecimal, binary, octal, and decimal.

EVERYDAY CALCULATORS, DONE RIGHT
BMI, calorie and macro needs (Mifflin-St Jeor), ideal weight range, daily water intake, discounts, and percentages — each one shows not just a number, but what it means, with the source formula listed underneath.

DATES, HANDLED PROPERLY
Calculate age, the difference between two dates, a date plus or minus N days, or the day of the week — built on a rigorous date engine, not string hacks.

MADE TO BE USED, NOT JUST LOOKED AT
Save results you care about, pick whether to reuse the value or the whole expression, and share any result as a clean image card in one tap.

PRIVATE BY DESIGN
Every calculation runs entirely on your device. Calculator X does not collect or share your data.

LOOKS THE WAY YOU WANT
Choose from multiple themes, from clean and minimal to fully illustrated exclusive designs — all built to stay legible and precise, never just decorative.

BUILT TO GROW
Calculator X is the foundation of a larger platform: an engineering mode with unlimited-precision integers and full bitwise operations, a programmer mode, and more calculators are on the way.