All calculators
Every calculator is free, works instantly and explains the maths in plain English.
Loans & Borrowing
Work out monthly payments, total interest and payoff dates before you sign.
Loan Payment
Find your monthly loan payment and the total interest you will pay.
Open calculatorCar Loan
See your monthly car payment after down payment, trade-in and sales tax.
Open calculatorMortgage
Estimate your full monthly housing payment, including tax and insurance.
Open calculatorCredit Card Payoff
See how long a card balance takes to clear and what the interest really costs.
Open calculatorCar Affordability
Find the car price your monthly budget genuinely supports, running costs included.
Open calculatorSaving & Investing
See how money grows over time with one-time and monthly contributions.
Compound Interest
See how a one-time investment and monthly savings grow over the years.
Open calculatorSavings Goal
Find out how much to save each month to hit a target amount on time.
Open calculatorRetirement
Project your retirement pot and the yearly income it could provide.
Open calculatorEveryday Money
Budgeting, take-home pay, tax and quick money questions answered clearly.
Monthly Budget
Split your take-home pay into needs, wants and savings.
Open calculatorSalary
Convert an hourly, weekly or annual wage into every other pay period.
Open calculatorTake Home Pay
Estimate your net pay after tax, retirement contributions and other deductions.
Open calculatorOvertime Pay
Work out how much extra you earn from overtime hours.
Open calculatorBonus
See how much of your bonus you keep after tax.
Open calculatorIncome Tax
Estimate your federal income tax using progressive US tax brackets.
Open calculatorCapital Gains Tax
Estimate the tax owed on profit from selling an investment.
Open calculatorGST
Add or remove Goods and Services Tax from a price.
Open calculatorHealth & Fitness
Body measurements, calories and training numbers, explained without jargon.
BMR
Find out how many calories your body burns at complete rest.
Open calculatorMacros
Turn your daily calorie target into grams of protein, carbs and fat.
Open calculatorBody Fat %
Estimate body fat percentage from a few tape measurements.
Open calculatorIdeal Weight
See estimated ideal body weight using well-known medical formulas.
Open calculatorHeart Rate Zones
Find your ideal heart rate zones for fat burn and cardio training.
Open calculatorWater Intake
Estimate how much water you should drink each day.
Open calculatorPregnancy Weight
See the recommended healthy weight gain range during pregnancy.
Open calculatorBody Surface Area
Estimate total body surface area, often used for medication dosing.
Open calculatorEveryday Life
Percentages, discounts, tips, bills and the small sums you do every day.
Split the Bill
Divide a shared bill fairly, including uneven shares and a tip.
Open calculatorUnit Price
Compare two products and find which one is really cheaper per unit.
Open calculatorRecipe Scaler
Scale a recipe up or down for a different number of servings.
Open calculatorFuel Cost
Estimate the fuel cost of a trip based on distance, efficiency and fuel price.
Open calculatorFuel Consumption
Work out your car's real fuel consumption from a fill-up, in litres per 100km or MPG.
Open calculatorTravel Cost
Add up flights, hotels, food and extras to budget a trip.
Open calculatorElectricity Bill
Estimate a device's running cost and your total monthly electricity bill.
Open calculatorWater Bill
Estimate your monthly water bill from usage and rate, plus a fixed service fee.
Open calculatorMath & Statistics
Averages, geometry, equations and probability with the working shown.
Mean/Median/Mode
Find the mean, median, mode and range of a list of numbers.
Open calculatorStd Deviation
Calculate the variance and standard deviation of a list of numbers.
Open calculatorRatio
Simplify a ratio and scale it to a new total or missing value.
Open calculatorFraction
Add, subtract, multiply or divide two fractions and simplify the result.
Open calculatorPrime Check
Check whether a number is prime and see its prime factors if not.
Open calculatorFactors
List every factor of a number and check if it is a perfect square.
Open calculatorLCM & GCD
Find the least common multiple and greatest common divisor of two numbers.
Open calculatorQuadratic
Solve ax² + bx + c = 0 for its real or complex roots.
Open calculatorDate & Time
Ages, date gaps, working hours and countdowns worked out precisely.
Age
Find your exact age in years, months and days as of any date.
Open calculatorBirthday Countdown
Count down the days, weeks and months until your next birthday.
Open calculatorCountdown
Count down the days, weeks and months to any future event.
Open calculatorDue Date
Estimate the due date from the first day of the last period.
Open calculatorDate Difference
Find the exact number of days, weeks, months and years between two dates.
Open calculatorTime Difference
Find the hours and minutes between two times, on the same or different days.
Open calculatorWorking Hours
Calculate hours worked in a shift, minus any unpaid break.
Open calculatorBusiness Days
Count the working days (Monday to Friday) between two dates.
Open calculatorUnit Converters
Length, weight, temperature, data and dozens of other everyday units.
Length
Convert between metres, feet, inches, miles, kilometres and more.
Open calculatorWeight
Convert kilograms, pounds, stones, ounces, grams and tonnes.
Open calculatorTemperature
Convert between Celsius, Fahrenheit, Kelvin and Rankine.
Open calculatorVolume
Convert litres, millilitres, gallons, cups, pints and fluid ounces.
Open calculatorArea
Convert square metres, square feet, acres, hectares and more.
Open calculatorSpeed
Convert km/h, mph, metres per second, knots and pace units.
Open calculatorData Storage
Convert bytes, kilobytes, megabytes, gigabytes and binary equivalents.
Open calculatorEnergy
Convert joules, calories, kilowatt-hours, BTU and food calories.
Open calculatorEducation
Grades, GPA, attendance and study planning for students and teachers.
GPA
Work out your semester GPA from your course grades and credit hours.
Open calculatorCGPA
Combine multiple semester GPAs into one cumulative GPA (CGPA).
Open calculatorGrade
Combine assignment, exam and quiz scores using their weights to find your final grade.
Open calculatorAttendance
Check your attendance percentage and how many classes you can afford to miss.
Open calculatorStudy Hours
Plan how many hours a day you need to study before an exam or deadline.
Open calculatorExam Score Needed
Find out what score you need on your final exam to reach your target grade.
Open calculatorReal Estate
Affordability, rental yield, property tax and the cost of closing a deal.
Home Affordability
See the house price your income, debts and deposit realistically support.
Open calculatorRental Yield
Compare gross and net rental yield on an investment property.
Open calculatorRental ROI
Work out cash-on-cash return on a mortgaged rental property.
Open calculatorProperty Tax
Estimate your annual and monthly property tax bill from the assessed value.
Open calculatorClosing Costs
Estimate the total cash you need on completion day, not just the deposit.
Open calculatorHome Value
Project what a property could be worth after years of appreciation.
Open calculatorMortgage Comparison
Compare two mortgage offers on payment and lifetime cost, fees included.
Open calculatorRefinance
Compare your current mortgage with a new rate and find the break-even point.
Open calculatorBusiness
Pricing, payroll, invoices, break-even and forecasting for small teams.
Break Even
Find out how many units you need to sell to cover your costs.
Open calculatorInventory Turnover
See how quickly your business sells through its stock.
Open calculatorCash Flow
Track the cash coming in and out of your business each month.
Open calculatorProfit & Loss
Summarize your revenue, costs and bottom-line profit.
Open calculatorMarkup
Work out your selling price from cost and a target markup.
Open calculatorProfit Margin
Find your profit margin, or the price needed to hit a target margin.
Open calculatorNPV
Find the net present value of a project's future cash flows.
Open calculatorIRR
Find the internal rate of return of a project's cash flows.
Open calculatorDeveloper Tools
Encoders, formatters, generators and converters for everyday dev work.
Base64
Encode text to Base64 or decode Base64 back to plain text.
Open calculatorJSON Formatter
Pretty-print, minify and validate JSON in one place.
Open calculatorRegex Tester
Test a regular expression against sample text and see every match.
Open calculatorUUID Generator
Generate deterministic, v4-shaped UUIDs from a seed.
Open calculatorHash Generator
Generate CRC32, DJB2 and FNV-1a hashes for any text.
Open calculatorPassword Generator
Generate a strong, deterministic password from a seed and settings.
Open calculatorTimestamp Converter
Convert between Unix timestamps and human-readable dates.
Open calculatorColor Converter
Convert colors between HEX, RGB and HSL.
Open calculatorAI Tools
Token counts and model pricing so you can budget an AI feature properly.
Token Estimator
Estimate how many tokens a block of text will use.
Open calculatorPrompt Cost
Estimate the cost of a single prompt and response.
Open calculatorOpenAI Tokens
Estimate tokens and cost for an OpenAI-style model call.
Open calculatorLLM Pricing
Compare the cost of running the same workload across several LLM pricing tiers.
Open calculatorFeatured loan, investing and AI tools
The dedicated tools people use most — beyond the standard calculator grid.