X-Calculator for iPhone & iPad
One calculator for
every kind of calculation.
From everyday arithmetic to engineering formulas and professional financial analysis — eight calculator modes in one native iOS app. Money is computed in exact decimal arithmetic, never floating point. Fully offline: no account, no analytics, no ads, no network access at all.
Eight modes, one engine
Simple & Scientific
Everyday arithmetic with memory keys, undo/redo and live preview — plus trig, logs, powers, constants, DEG/RAD/GRAD and a 2nd-function layer. Errors are named and positioned, never NaN.
Engineering
Solve-for-the-unknown forms in SI units: Ohm's law, electrical power, series/parallel resistance, frequency ↔ wavelength, force, pressure, energy, torque and fluid flow.
Financial
15 calculators — EMI with full amortisation schedule (CSV & PDF export), SIP with step-up, FV/PV, CAGR, NPV/IRR/XIRR, retirement, inflation and more. Every result shows its assumptions.
Programmer & Statistics
BIN / OCT / HEX with bitwise operations, and descriptive statistics — mean, median, mode, quartiles, variance — from any pasted data list.
Date & Time + Conversion
Date differences, business days, and unit conversion across length, mass, temperature and more.
Private by design
No account, no analytics, no network code. History and settings stay on your device — export or delete them any time.
Built for correctness
Money is decimal, never binary floating point. Rounding policies are explicit — half-up, bankers', toward −∞ or +∞ — and every financial result lists the compounding, timing and day-count conventions it used. The calculation core is covered by unit tests against published reference values.