Home / Calculators
All Calculators & Converters
47 free online tools. Pick one, type your numbers, and get results straight away.
Construction
Building, materials, and trade calculators
Mortar Mix Calculator
Calculate cement, sand, and water quantities for mortar.
Concrete Mix Calculator
Calculate cement, sand, and aggregate quantities for any concrete grade.
Brick Calculator
Work out how many bricks you need for a wall, plus mortar volume.
Paint Calculator
Calculate how much paint you need for a room, with door and window deductions.
Finance
Money, tax, loans, and budgeting calculators
VAT Calculator
Add or remove VAT from any amount at standard, reduced, or custom rates.
Loan Calculator
Calculate monthly repayments, total interest, and total cost for any loan.
Maths
Numbers, percentages, and arithmetic calculators
Calculator
A free online calculator with standard and scientific modes.
Percentage Calculator
Find X% of Y, what percentage X is of Y, or percentage change.
Everyday
General-purpose calculators for everyday life
Tip Calculator
Calculate tips and split the bill between people.
Discount Calculator
Work out sale prices, savings, and final cost after discount.
Age Calculator
Calculate exact age in years, months, and days from date of birth.
Health
Body, wellness, and medical calculators
BMI Calculator
Calculate your Body Mass Index from height and weight.
Calorie Calculator
Calculate daily calorie needs using the Mifflin-St Jeor equation.
Sleep Calculator
Find the best times to sleep and wake based on 90-minute sleep cycles.
Family
Parenting, pregnancy, and childcare calculators
Age Calculator
Calculate exact age in years, months, and days from date of birth.
Home
Household, energy, and property calculators
Electricity Cost Calculator
Work out how much an appliance costs to run per day, week, month, and year.
Travel
Driving, trips, and journey calculators
Fuel Cost Calculator
Calculate fuel cost for any journey in metric or imperial.
Time
Date, time, and scheduling calculators
Time Between Dates
Calculate the exact time between any two dates in years, months, weeks, and days.
Days Until Calculator
Count down the days, weeks, and months until any future date.
Time Duration Calculator
Calculate the duration between two clock times in hours and minutes.
Hours Calculator
Add and subtract hours and minutes to get a total duration.
Date Add/Subtract Calculator
Add or subtract days, weeks, months, or years from any date.
Time Zone Converter
Convert any time from one time zone to another instantly.
World Clock
See the current time in multiple cities and time zones at once.
Meeting Planner
Find overlapping working hours across multiple time zones.
Countdown Timer
Set a countdown timer with hours, minutes, and seconds.
Stopwatch
Free online stopwatch with lap times and millisecond precision.
Employment
Work, pay, and timesheet calculators
Timesheet Calculator
Enter start and end times to calculate total hours worked.
Overtime Calculator
Calculate overtime pay with 1.5x and 2x rate thresholds.
Break Time Calculator
Deduct breaks from your shift to find net working hours.
Hourly to Salary Converter
Convert between hourly pay, daily, weekly, monthly, and annual salary.
Pay Period Calculator
Calculate your earnings per pay period from annual salary or hourly rate.
Work Days Calculator
Count the number of business days between two dates.
Deadline Calculator
Find the date that is a given number of working days from today.
Fitness
Exercise, sport, and training calculators
Pace Calculator
Calculate running or walking pace, distance, or time from any two values.
Education
Study, learning, and reading calculators
Reading Time Calculator
Estimate how long it takes to read any text based on word count.
Food
Cooking, baking, and recipe calculators
Recipe Scaler
Scale any recipe up or down by adjusting the number of servings.
Science
Physics, chemistry, and engineering calculators
Dilution Calculator
Calculate dilution ratios using C1V1 = C2V2 for cleaning, gardening, and lab solutions.
Converters
Unit conversion calculators
Length Converter
Convert between metres, feet, inches, centimetres, kilometres, yards, and miles.
Weight Converter
Convert between kilograms, pounds, ounces, stones, grams, and tonnes.
Volume Converter
Convert between litres, gallons, pints, cups, and fluid ounces. UK and US measurements.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin.
Area Converter
Convert between square metres, square feet, acres, hectares, and more.
Speed Converter
Convert between km/h, mph, metres per second, and knots.
Pressure Converter
Convert between PSI, bar, Pascal, kilopascal, and atmospheres.
Energy Converter
Convert between joules, calories, kilowatt-hours, and BTU.
Data Converter
Convert between bytes, kilobytes, megabytes, gigabytes, and terabytes.
Time Converter
Convert between seconds, minutes, hours, days, and weeks.