Math & Everyday

Everyday arithmetic with full keypad entry.

Trig, logs, powers, and constants via expression input.

Percent of a value, share of total, or change over time.

Add, subtract, multiply, or divide two fractions.

Sale price, savings, and stacked discounts.

Add a duration to a time, or find the gap between two.

Generate random integers in any range, with or without repeats.

Weighted grade point average across your courses.

Weighted final score and letter grade from assignments.

A precise stopwatch with laps, plus a countdown timer.

Check primality, factor a number, or list primes up to N.

Mean, median, mode, range, and standard deviation from a data set.

Add, multiply, transpose, invert, or find the determinant.

Expected score and rating change after a rated game.

Cubic yards of concrete needed for a slab, plus bags required by size.

National-average cost range to build a deck, by size and decking material.

National-average installed cost range for a new roof, by material and size.

Boxes of flooring to buy for a room, with a waste-factor buffer.

Fuel cost for a trip, split among passengers if you're carpooling.

Gallons of paint needed for a room, after door/window deductions and coats.

National-average cost range for a kitchen, bathroom, or whole-house renovation.

Enter any two of voltage, current, resistance, or power to solve for the rest.

Real or complex roots of ax² + bx + c = 0, with the discriminant shown.

nPr and nCr for any n and r, computed without overflowing on large factorials.

Single-event, AND/OR combined, and conditional probability, in one calculator.

CO2e per passenger for a specific flight, by distance and cabin class.

How many Pomodoro work/break cycles fit your available study time, and when you'll finish.

Split a shared hotel bill fairly, with resort/city tax handled as a flat fee or percentage.

Convert between rise/run ratio, percentage grade, and angle in degrees — for ramps, roofs, and roads.

Solve any triangle from 3 known sides or angles, with area, perimeter, and the ambiguous SSA case handled correctly.

Sheets of drywall needed for walls and ceiling, after door/window deductions.

Cubic yards and bags of mulch or soil needed for a garden bed.

Tons and cubic yards of gravel needed, by material type and depth.

Tiles and boxes needed for a floor or wall, with a waste-factor buffer.

Posts and rails needed for a fence run, from total length and post spacing.

Pavers plus base and sand volume needed for a patio, per ICPI depth guidance.

Voltage drop across a wire run from gauge, current, and distance, against NEC's 3%/5% guidance.

Molar mass of any chemical formula, with a full element-by-element breakdown.

Convert between pH, pOH, and hydrogen/hydroxide ion concentration.

Estimated annual household CO2e from home energy, driving, flights, and diet.

Scale a recipe's ingredients up or down, rounded to clean kitchen fractions.

Convert between cooking volume and weight units, by ingredient.

Baker's percentages for bread dough — flour, water, salt, and yeast.