RIG-PRO Scientific Calculator

RIG-PRO Scientific Calculator is a fast, offline, all-in-one calculator for engineers, students, and technical field work. No ads, no sign-in, no internet required — everything runs on your device.

FIVE CALCULATORS IN ONE

• Scientific — a full function set: trigonometry and inverse/hyperbolic functions, logarithms and exponentials, powers and roots, factorial, nCr/nPr, permutations and combinations, percentages, DEG/RAD/GRA angle modes, memory and last-answer (Ans), and a live expression editor with a movable cursor.

• Equation Solver — linear, quadratic and cubic equations, plus 2×2 and 3×3 systems of linear equations, with real and complex roots.

• Calculus — numeric derivative (d/dx) and definite integral (∫dx) of an expression in x, evaluated on your device.

• Statistics — single-variable statistics (mean, standard deviation, sum, sum of squares) and two-variable linear regression.

• Programmer / Base-N — work in binary, octal, decimal and hexadecimal with bitwise operations (AND, OR, XOR, NOT, shifts) and instant base conversion.

BUILT FOR REAL USE

• 100% offline — no account, no network, no ads, no tracking.
• Your calculation history is saved on the device and survives restarts.
• Multiple themes — AMOLED (battery-friendly true black), dark, light and more; your choice is remembered.
• Clean, high-contrast Material 3 interface designed for quick one-handed entry.
• Digit grouping for easy reading of large numbers.

PRIVACY

The app collects no personal data and sends nothing off your device. History and settings are stored locally in the app's private storage only.

Built by RIG-PRO for people who need a dependable calculator that just works — on the rig, in the field, or at the desk.