Free Everyday Math Calculators

Most of the maths people actually do is small and practical: splitting a restaurant bill, working out a sale price, finding a percentage change, averaging test scores or estimating how many tiles a bathroom needs. These calculators do those jobs in a couple of taps, show the formula behind the answer and give worked examples, so you can check them or learn the method.

Shopping and money in daily life

Tips, discounts and percentage changes.

Tip CalculatorCalculate the tip, the total and each person’s share of a bill.

Discount CalculatorWork out the sale price, the savings and the final total with tax after one or two discounts.

Percentage CalculatorFind a percent of a number, percent change, and increases or decreases.

Percentage Change CalculatorFind the percent increase or decrease between two numbers.

School and study

Averages, GPA, final grades and ratios.

Average CalculatorFind the mean, weighted average, geometric mean and harmonic mean of a list.

GPA CalculatorWork out your grade point average from letter grades and credit hours on the 4.0 scale.

Grade Calculator (Weighted Grades & Final Exam)Calculate your weighted course grade from assignments, quizzes and exams, and the score needed on the rest to reach a target grade.

Ratio CalculatorSolve proportions like A : B = C : x and simplify ratios.

Times Table GeneratorGenerate the multiplication table for any number, up to 30 rows.

Rounding CalculatorRound to decimal places, significant figures or the nearest 10, 100 or 1,000.

Handy utilities

Generate a strong password, make a QR code or create a printable invoice.

Password GeneratorCreate strong random passwords with your browser’s secure random generator, with entropy and crack-time estimates.

QR Code GeneratorMake a free QR code for a link, text, Wi-Fi login or email address and download it as PNG or SVG — made in your browser.

Invoice GeneratorCreate a clean invoice with line items, tax, discount and totals, then print it or save it as a PDF — free, no sign-up.

Random generators and games

Fair random numbers, words and dice, generated with your browser’s secure random source.

Random Number GeneratorPick truly random numbers in any range: whole or decimal, unique or repeating, sorted, with sum and average.

Random Word GeneratorGet random English words — nouns, adjectives or verbs, with optional starting letters — for games, writing prompts and brainstorming.

Dice RollerRoll d4, d6, d8, d10, d12, d20 or d100 — any number of dice, with modifiers and advantage or disadvantage.

Focus, timers and typing

A Pomodoro timer, a countdown timer, a typing test and a work-hours calculator.

Pomodoro TimerA free online Pomodoro timer: 25-minute focus sessions, short and long breaks, sound alerts and a live countdown in the tab title.

Countdown TimerAn online countdown timer for any duration or a date and time, with a sound alarm and a live clock in the tab title.

Typing TestMeasure your typing speed (WPM) and accuracy with a timed test of 30 seconds to 3 minutes — free, no sign-up.

Work Hours CalculatorAdd up hours worked from start and end times with breaks and overnight shifts, plus overtime and gross pay.

Selling online

Know your real profit after marketplace fees.

eBay Fee CalculatorWork out eBay final value fees, per-order fees, ad fees and your real profit — and the price you need to hit a profit target.

Travel and home projects

Speed, distance and time, and flooring quantities.

Speed, Distance and Time CalculatorFind speed, distance or travel time from the other two, with km, miles, minutes and hours.

Fuel Cost CalculatorWork out the fuel needed and cost for a trip in km or miles, with km/l, L/100 km or mpg, split between people.

Tile CalculatorWork out how many tiles, boxes and the cost to cover a floor or wall, in feet or metres.

Geometry CalculatorArea, perimeter, circumference, volume and surface area of common shapes.

Mental-maths shortcuts these tools confirm

10% of anything: move the decimal one place left. 20% is double that, 15% is 10% plus half of it.
Tip: work out 10%, double it for 20%, or add half again for 15%.
Discount: a 30% discount leaves 70% of the price, so multiply by 0.7.
Average: add everything, divide by the count.

When the numbers get awkward, the calculators above do the arithmetic and show their working.