🇬🇧 Made for the UK
Free Online Calculators
Built for the UK
700+ accurate, easy-to-use calculators for finance, tax, health, and everyday life — completely free, no sign-up needed.
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Popular Calculators
Most used this monthPetrol vs Diesel Lifetime Cost Calculator
Compare total running costs over a car’s lifetime.
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Energy Bill Income Percentage Calculator
See what share of income your energy bills take.
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Blood Pressure Chart Calculator
Check your blood pressure reading against NHS ranges.
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Your Salary vs Premier League Player Calculator
Compare your earnings to a footballer’s salary.
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Days Until Retirement Calculator
Count down the days to your retirement.
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Dog to Human Years Calculator
Work out your dog’s age in human years.
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All Calculators
Browse by categoryFun & British Trivia
25 toolsUmbrella Lifespan CalculatorHow long your brolly will survive UK weather
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Autumn Leaf Raking Time CalculatorEstimate how long raking your garden will take
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Calories to Steps: Mince Pie CalculatorHow many steps to burn off a mince pie
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James Bond Films Marathon Time CalculatorTotal runtime to watch every Bond film
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Stonehenge Age CalculatorExplore the age and history of Stonehenge
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Premier League Goals to Minutes CalculatorConvert goals scored into playing minutes
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Pub Calories to Gym Hours CalculatorSee how long you’d need to gym off a pub session
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Sunday Roast Burpees CalculatorHow many burpees to burn off a Sunday roast
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London Eye Rotations CalculatorCalculate rotations and distance travelled on the London Eye
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British Museum Walking Distance CalculatorEstimate how far you’ll walk exploring the museum
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Beatles Songs Duration CalculatorTotal listening time for the Beatles’ discography
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Wembley Stadium Area CalculatorExplore the size and area of Wembley Stadium
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Harry Potter Reading Time CalculatorHow long it takes to read the whole series
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Weight in Full English Breakfasts CalculatorConvert any weight into full English breakfasts
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Your Salary vs Premier League Player CalculatorCompare your earnings to a footballer’s salary
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Height in Double-Decker Buses CalculatorConvert any height into double-decker buses
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Tesco Meal Deal Guide CalculatorWork out the best value meal deal combinations
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M25 Concrete Time CalculatorA quirky look at the M25’s construction and travel time
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Tea Breaks Lifetime CounterCount how many tea breaks you’ll take in a lifetime
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Pint Purchasing Power CalculatorHow your salary’s pint-buying power has changed
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Boxing Score CalculatorScore a boxing bout round by round
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Sausage Roll Inflation CalculatorTrack how sausage roll prices have changed over time
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Dog to Human Years CalculatorWork out your dog’s age in human years
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Cousin CalculatorWork out how you’re related to a family member
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Chinese Horoscope CalculatorFind your Chinese zodiac sign and traits
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Life & Time
7 toolsEvening Class Investment Return CalculatorSee the return on investing in evening classes
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Language Learning Time Required CalculatorEstimate how long it takes to learn a new language
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Time Left With Parents CalculatorA perspective on remaining time with loved ones
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Netflix Hours vs Books Read CalculatorCompare streaming time to books you could have read
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Commute Hours to Workdays CalculatorSee how many workdays your commute adds up to
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Screen Time to Days Lost CalculatorSee how many days a year go to screen time
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Shift Pattern CalculatorPlan and track rotating shift patterns
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Health & Fitness
9 toolsUK Winter Vitamin D Sunlight Hours CalculatorEstimate sunlight hours needed for vitamin D in winter
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Sugar Intake Tooth Decay Risk CalculatorEstimate dental risk from your sugar intake
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Blood Pressure Chart CalculatorCheck your blood pressure reading against NHS ranges
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Kilometers to Steps CalculatorConvert distance walked into step count
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Kilograms to Calories CalculatorEstimate calories linked to a kilogram of body weight
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Race Equivalency CalculatorPredict your race time at a different distance
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Treadmill Speed & Pace CalculatorConvert treadmill speed into running pace
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Keto Carb CalculatorWork out your daily net carb target on keto
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Contact Lens Prescription CalculatorConvert a glasses prescription to contact lenses
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Finance, Legal & Business
4 toolsEnergy Bill Income Percentage CalculatorSee what share of income your energy bills take
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Days Until Retirement CalculatorCount down the days to your retirement
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YouTube Engagement Rate CalculatorCalculate engagement rate for YouTube content
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Misdiagnosis Claim CalculatorEstimate potential medical misdiagnosis compensation
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Home & DIY
6 toolsHeat Pump Dryer Cost CalculatorEstimate running costs of a heat pump tumble dryer
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Wall Panelling Spacing CalculatorPlan even spacing for wall panelling projects
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Flat Roof Fall Ratio CalculatorCalculate the correct fall ratio for a flat roof
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Panelling CalculatorCalculate materials needed for wall panelling
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Wheelchair Ramp Slope CalculatorCalculate a safe, compliant ramp slope
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Fire Alarm Battery CalculatorEstimate fire alarm battery life and replacement
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Automotive & Travel
3 toolsEnvironment & Sustainability
4 toolsPlastic Waste Sea Turtle Impact CalculatorVisualise the impact of your plastic waste on marine life
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Carbon Footprint Trees Needed CalculatorHow many trees offset your carbon footprint
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Single-Use Coffee Cups Per Year CalculatorSee how many disposable cups you use annually
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Food Waste to Money Lost CalculatorWork out how much wasted food is costing you
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Food & Cooking
2 toolsScience & Engineering
7 toolsRelative Atomic Mass CalculatorCalculate the relative atomic mass of an element
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Gas Strut Force CalculatorCalculate the force needed from a gas strut
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Potential Divider CalculatorCalculate output voltage of a potential divider
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Air Density CalculatorCalculate air density from pressure and temperature
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Hydrometer CalculatorCorrect hydrometer readings for temperature
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Speeds & Feeds CalculatorCalculate cutting speeds and feeds for machining
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Absolute Humidity CalculatorCalculate absolute humidity from temperature and RH
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Maths & Statistics
7 toolsEquation of a Line CalculatorFind the equation of a line from two points
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Spearman’s Rank CalculatorCalculate Spearman’s rank correlation coefficient
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Inverse Normal Distribution CalculatorFind z-values from the normal distribution
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Inverse Tan CalculatorCalculate the arctangent of a value
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Partial Differentiation CalculatorCalculate partial derivatives of a function
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Recurring Decimal to Fraction CalculatorConvert a recurring decimal into a fraction
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Octagon CalculatorCalculate area, perimeter and angles of an octagon
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Length & Distance Converters
24 toolsNanometers to Millimeters ConverterConvert nanometres to millimetres instantly
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Micrometers to Meters CalculatorConvert micrometres to metres instantly
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Micrometers to Nanometers CalculatorConvert micrometres to nanometres instantly
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Feet to Miles CalculatorConvert feet to miles instantly
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Micrometers to Centimeters CalculatorConvert micrometres to centimetres instantly
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Feet to Yards CalculatorConvert feet to yards instantly
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Micrometers to Millimeters CalculatorConvert micrometres to millimetres instantly
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Feet to Millimeters CalculatorConvert feet to millimetres instantly
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Kilometers to Yards CalculatorConvert kilometres to yards instantly
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Kilometers to Nautical Miles CalculatorConvert kilometres to nautical miles
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Kilometers to Meters CalculatorConvert kilometres to metres instantly
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Kilometers to Feet CalculatorConvert kilometres to feet instantly
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Kilometers to Millimeters CalculatorConvert kilometres to millimetres instantly
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Centimetres to Kilometres CalculatorConvert centimetres to kilometres instantly
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Centimetres to Pixels CalculatorConvert centimetres to pixels at a given DPI
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Centimetres to Decimetres CalculatorConvert centimetres to decimetres instantly
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Centimetres to Micrometres ConverterConvert centimetres to micrometres instantly
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Inches to Feet ConverterConvert inches to feet instantly
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Centimetres to Inches CalculatorConvert centimetres to inches instantly
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Millimetres to Centimetres CalculatorConvert millimetres to centimetres instantly
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Feet to Meters ConverterConvert feet to metres instantly
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Inches to Millimetres CalculatorConvert inches to millimetres instantly
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Centimetres to Feet CalculatorConvert centimetres to feet instantly
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Kilometers to Miles CalculatorConvert kilometres to miles instantly
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Weight & Volume Converters
16 toolsKilograms to Ounces ConverterConvert kilograms to ounces instantly
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Kilograms to Cubic Decimeters CalculatorConvert kilograms to cubic decimetres by density
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Kilograms to Millilitres CalculatorConvert kilograms to millilitres by density
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Kilograms to Cubic Metres CalculatorConvert kilograms to cubic metres by density
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Kilograms to Cups CalculatorConvert kilograms to cups for cooking
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Kilograms to Gallons CalculatorConvert kilograms to gallons by density
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Kilograms to Grams CalculatorConvert kilograms to grams instantly
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Centimetres to Litres CalculatorConvert cubic centimetres to litres
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Kilograms to Tonnes ConverterConvert kilograms to metric tonnes
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Kilograms to Kilonewtons CalculatorConvert mass in kilograms to force in kilonewtons
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Litres to Gallons CalculatorConvert litres to gallons instantly
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Ounces to Millilitres CalculatorConvert fluid ounces to millilitres
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Cups to Grams CalculatorConvert cooking cups to grams
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Ounces to Grams ConverterConvert ounces to grams instantly
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Kilograms to Stone CalculatorConvert kilograms to stone instantly
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Kilograms to Pounds CalculatorConvert kilograms to pounds instantly
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Speed, Pressure & Temp Converters
8 toolsMPH to Mach CalculatorConvert miles per hour to Mach speed
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MPH to KPH CalculatorConvert miles per hour to kilometres per hour
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Kilometers to Knots CalculatorConvert kilometres per hour to knots
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Minutes to Hours CalculatorConvert minutes into hours instantly
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Bar to PSI CalculatorConvert bar to pounds per square inch
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Minutes to Hours ConverterA quick minutes-to-hours conversion tool
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KMH to MPH CalculatorConvert kilometres per hour to miles per hour
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Fahrenheit to Celsius CalculatorConvert Fahrenheit to Celsius instantly
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Why Use Our Calculators?
700+
Comprehensive Tools
From everyday conversions to niche UK trivia, we cover every calculation you might need.
✓
UK-Specific Accuracy
Built around HMRC rules, UK legislation, and British standards — not generic global data.
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Always Free
Every calculator is fully free. No account, no subscription, no hidden charges — ever.
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Works on Any Device
Fully responsive — use on your phone, tablet, or desktop with the same great experience.
Frequently Asked Questions
Common questionsYes — every calculator on this site is completely free. There’s no sign-up, no account required, and no premium tier. We believe useful tools should be accessible to everyone.
Our calculators are built using current UK legislation and reliable reference data. While they give reliable estimates, we always recommend verifying financial, medical or legal decisions with a qualified professional.
Absolutely. Every tool is fully responsive and tested on iOS and Android. The layouts adapt to your screen size so you get the same quality experience on any device.
Most of our tools are built specifically for UK users — using British units, UK context, and everyday UK references. Unit converters and general maths/science tools work for anyone, anywhere.
We review and update calculators regularly, and we’re constantly adding new ones — including seasonal, trivia and everyday-life tools requested by our users.
Yes! We’re always expanding our collection based on what our users need. Use the contact page to suggest a calculator and we’ll do our best to build it.