All calculators

A fast standard calculator with memory keys and full keyboard support.

Trigonometry, logarithms, exponents and factorials with DEG/RAD modes.

Type plain English like "25% of 450" or "72 kg to lbs" and get stepped answers.

Percent of a number, percent change, and what percent one number is of another.

Work out the tip and split the bill between any number of people.

Split a bill evenly or by custom shares, including tax and tip.

Mean, median, mode and range from any list of numbers.

Simplify ratios, scale them up or down, and solve for a missing term.

Generate random numbers in a range, with or without duplicates.

Round to decimals, significant figures, or the nearest multiple.

Add, subtract, multiply and divide fractions with simplified results.

Find the sale price and how much you save at any percentage off.

Monthly payment, total interest and a full amortization schedule.

Home loan payments including taxes, insurance and down payment.

Grow a balance over time with any compounding frequency and contributions.

Interest earned or owed using the straight-line simple interest formula.

Auto loan payments with trade-in, down payment and sales tax.

How long to clear a card balance and what the interest really costs.

How much to set aside each month to hit a target by a given date.

Project a retirement balance from contributions, returns and years.

Return on investment as a percentage, plus annualized return.

Compound annual growth rate between a starting and ending value.

A full month-by-month breakdown of principal and interest paid.

Compare snowball and avalanche strategies across multiple debts.

How much deposit you need and what it does to your monthly payment.

Net present value of a cash flow series at a chosen discount rate.

Convert between world currencies using live exchange rates.

Gross margin, markup and profit from cost and revenue.

Set a selling price from cost and a target markup percentage.

Add or remove VAT at any rate and see the net, tax and gross split.

Work out tax on a purchase, or strip tax out of a total.

Units and revenue needed to cover fixed and variable costs.

Convert between hourly, daily, weekly, monthly and annual pay.

Turn an hourly rate into yearly pay, allowing for holidays.

Commission earned on sales at flat or tiered rates.

Overtime pay at time-and-a-half, double time or a custom multiplier.

Interest and penalties owed on an overdue invoice.

CLV from average order value, purchase frequency and retention.

Monthly burn and how many months of runway are left.

Body mass index in metric or imperial, with category and healthy range.

Basal metabolic rate — the calories you burn at complete rest.

Total daily energy expenditure from your BMR and activity level.

Daily calories to lose or gain weight at a chosen rate.

Protein, carb and fat targets for your calories and goal.

Body fat percentage using the US Navy circumference method.

Healthy weight range from height using four established formulas.

Daily hydration target based on weight, activity and climate.

Max heart rate and the five training zones for your age.

Estimate your 1RM from a set, plus a full percentage table.

Running pace, time or distance — solve for whichever you're missing.

Estimated due date and current week from your last period.

Solve linear and quadratic equations with step-by-step working.

Roots, discriminant and vertex for any ax² + bx + c = 0.

Solve 2×2 and 3×3 simultaneous linear systems.

Plot multiple functions on an interactive, zoomable canvas.

Determinants, inverses, multiplication and transposes.

Dot product, cross product, magnitude and angle between vectors.

Greatest common divisor and lowest common multiple of any numbers.

Test primality and get the full prime factorization.

Exact factorials of large numbers using big integers.

nPr and nCr with and without repetition.

Logs in any base, plus natural log and antilog.

Powers, roots and scientific notation conversion.

Square, cube and nth roots with simplified radical form.

Arithmetic and geometric sequences — nth term and sum.

Convert between standard form, decimals and engineering notation.

Numerical derivatives and definite integrals of a function.

Solve for any side of a right triangle with a² + b² = c².

Area, perimeter, angles and height from sides or angles.

Area, circumference, diameter and arc length from any one value.

Area, perimeter and diagonal of a rectangle or square.

Area, perimeter and median of a trapezoid.

Volume and surface area of a sphere from radius or diameter.

Volume, lateral and total surface area of a cylinder.

Volume, slant height and surface area of a cone.

Volume, surface area and diagonal of a cube or cuboid.

Area of any common 2D shape in one place.

Volume of any common 3D solid in one place.

Distance, midpoint and slope between two coordinate points.

Gradient, angle and line equation from two points.

Interior angles, area and perimeter of any regular polygon.

Full descriptive statistics and a distribution chart for a data set.

Population and sample standard deviation, variance and mean.

All three measures of central tendency, plus range.

Average where each value carries a different weight.

Standard score and the probability either side of it.

Confidence interval and margin of error for a sample mean.

Single and combined event probability, odds and complements.

Exact and cumulative binomial probabilities.

Area under the normal curve between any two values.

Pearson correlation coefficient between two data sets.

Line of best fit, slope, intercept and R² with a scatter plot.

Percentile rank and the value at any percentile.

How many responses you need for a given confidence and margin.

Exact age in years, months, days — plus your next birthday.

Days, weeks, months and years between any two dates.

Find the date a number of days, weeks or months from another.

Working days between dates, skipping weekends and holidays.

Hours and minutes between two times, and add or subtract durations.

A live countdown to any future date and time.

ISO week number for any date, and the dates in any week.

Check whether a year is a leap year and list nearby ones.

What day any date falls on, past or future.

Convert a time between any two zones, correct for daylight saving.

Bedtimes and wake times aligned to 90-minute sleep cycles.

Grade point average from your courses, credits and grades.

Cumulative GPA across semesters, with percentage conversion.

Your current grade from weighted assignments and exams.

The score you need on the final to hit your target grade.

Percentage and letter grade from marks out of a total.

Your attendance percentage and how many classes you can miss.

Length, weight, temperature, area, volume, speed, data and more.

Metres, feet, inches, miles, kilometres and everything between.

Kilograms, pounds, ounces, stones and tonnes.

Celsius, Fahrenheit and Kelvin, converted instantly.

km/h, mph, m/s, knots and mach.

Litres, gallons, cups, pints and millilitres.

Square metres, feet, acres, hectares and more.

Bytes, kilobytes, megabytes, gigabytes and terabytes.

Convert numbers to Roman numerals and back.

Spell out any number in words, including currency format.

Voltage, current, resistance and power from any two values.

Motion under constant acceleration — the SUVAT equations.

Newton's second law — force, mass and acceleration.

Kinetic and potential energy, and work done.

Density, mass or volume — solve for any one.

Pressure from force and area, in pascals, bar or psi.

Electrical and mechanical power, energy and running cost.

Convert between wavelength, frequency and wave speed.

Output voltage across a two-resistor divider.

Torque from force and lever arm, in Nm or lb-ft.

Litres or gallons of paint needed, allowing for doors and windows.

Boxes of flooring needed for a room, including waste allowance.

Number of tiles and grout needed for a floor or wall.

Cubic metres or yards of concrete for slabs, footings and columns.

Roof area and shingle bundles from footprint and pitch.

Rolls of wallpaper needed, accounting for pattern repeat.

Bags or cubic yards of mulch, soil or gravel for a bed.

Posts, rails and panels needed for a run of fencing.

Rise, run and number of steps for a code-compliant staircase.

Heating and cooling capacity needed for a room.

What a trip costs in fuel, and the cost per person when shared.

MPG, km/L and L/100km from distance and fuel used.

Solve for whichever of the three you're missing.

Total trip budget across fuel, tolls, food and accommodation.

Cost to charge an electric vehicle and cost per mile.

Binary, octal, decimal and hex with bitwise operations.

Add, subtract, multiply and divide binary numbers.

Convert between any bases from 2 to 36.

Epoch seconds and milliseconds to human dates, and back.

Resize while keeping proportions, and identify common ratios.

Bits, bytes and every SI and binary multiple.

Network, broadcast, host range and mask from CIDR notation.

HEX, RGB, HSL and HSV with a live preview.