Everyday numbers, made easy.
Practical calculators for your money, car, home, work and energy bills. Enter your numbers and get a clear answer straight away.
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Search all 24 tools or filter by category.
Air Conditioner Running Cost Calculator
Estimate the electricity cost of running an air conditioner.
CarsCar Loan Calculator
Estimate car-loan repayments, finance amount and total interest.
HomeConcrete Calculator
Estimate concrete volume in cubic metres for a rectangular slab.
HomeDecking Calculator
Estimate linear metres of decking from deck area and board width.
EverydayDiscount Calculator
Calculate the sale price and amount saved from a percentage discount.
EnergyElectricity Cost Calculator
Estimate the electricity cost of running an appliance.
CarsEV Charging Cost Calculator
Estimate EV energy use and charging cost for a journey.
CarsFuel Cost Calculator
Estimate how much fuel a trip will use and what it will cost.
CarsFuel Economy Converter
Convert L/100km to US MPG and UK MPG.
MoneyAustralian GST Calculator
Work out GST, GST-exclusive and GST-inclusive amounts in Australia.
MoneyLoan Repayment Calculator
Estimate monthly repayments and total repaid on a standard principal-and-interest loan.
MoneyMarkup & Margin Calculator
Calculate gross profit, markup percentage and gross margin from cost and selling price.
MoneyMortgage Repayment Calculator
Estimate monthly home-loan repayments and total interest.
WorkOvertime Pay Calculator
Estimate overtime earnings from hourly rate, hours and multiplier.
HomePaint Calculator
Estimate litres of paint needed for a wall or surface.
WorkPay Rise Calculator
Calculate your new salary and extra annual or monthly pay after a percentage raise.
EverydayPercentage Calculator
Find what percentage one number is of another.
WorkSalary to Hourly Rate Calculator
Convert an annual salary into an approximate hourly rate.
MoneySavings Goal Calculator
Estimate how many months it will take to reach a savings target.
EnergySolar Savings Calculator
Estimate annual bill savings from self-used solar generation.
EverydaySpeed Distance Time Calculator
Calculate average speed from distance and time.
EverydayTip & Bill Split Calculator
Calculate a tip, total bill and equal amount per person.
CarsTowing & Payload Calculator
Estimate remaining vehicle payload after people, cargo and tow-ball download.
EverydayUnit Price Calculator
Calculate price per unit to compare different pack sizes.
Browse by category
Money
Simple calculators for loans, GST, savings, percentages and everyday money decisions.
Cars
Practical tools for fuel, EV charging, car finance, towing and fuel economy.
Home
Quick calculators for paint, concrete, decking and common home projects.
Work
Turn salary, overtime and pay-rise figures into clear numbers.
Energy
Estimate electricity use, air-conditioner costs, solar savings and EV charging.
Everyday
Useful percentage, discount, unit-price, bill-splitting and speed calculators.
Built for quick, useful answers
HandyNumbers puts the calculator first, then explains the formula, gives a worked example and points out the assumptions that can affect the result.