Tools & Converters Calculators

26 free calculators · Updated for 2026/27

Small sums come up constantly, in shops, in kitchens, on timesheets and when buying from abroad, and most are quicker to check than to work out in your head. Everyday calculators and converters sit in this group, covering percentages and discounts, dates and durations, weights, lengths, temperatures and clothing sizes, along with planning tools for a monthly budget or a wedding.

Increases, decreases and what share one number is of another all go through the Percentage Calculator, while the Discount Calculator turns a sale sticker into the price you pay and the amount saved. The Split Bill Calculator divides an itemised bill between people, the Cooking Measurement Converter moves a recipe between millilitres, cups, tablespoons and ounces and includes a gas mark chart, and the Clothing Size Converter (UK/EU/US) matches sizes across the three systems. What a sum was worth in the past, or will be worth later, comes from the Inflation Calculator.

P

Percentage Calculator

Calculate percentages, percentage increase/decrease, and find what percentage one number is of another.
W

Weight Converter (kg / stone / pounds)

Convert between kilograms, stone, pounds, ounces and tonnes. Includes UK stone & pounds display.
C

Cost of Living Calculator

Track monthly expenses against take-home pay. See surplus or shortfall with editable UK average costs.
A

Age Calculator — Years, Months & Days

Calculate your exact age in years, months and days from your date of birth.
C

Currency Converter — Live Exchange Rates

Convert between GBP, EUR, USD and 150+ world currencies with live exchange rates.
D

Discount Calculator

Calculate sale prices, savings and reverse percentage discounts instantly.
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Tip Calculator — Restaurant & Service Tips

Calculate tips and split bills between multiple people. Choose your tip percentage.
D

Date Calculator — Days Between Dates

Calculate the number of days, weeks and working days between two dates. Add or subtract days from a date.
I

Inflation Calculator

See what money was worth in the past or what it will be worth in the future with UK inflation rates.
W

Wedding Budget Calculator

Plan your wedding budget with a typical UK breakdown. See cost per guest and category allocations.
N

Number to Words Converter

Convert any number to words in English. Includes cheque format for GBP amounts.
R

Random Number Generator

Generate random numbers within a range. Supports multiple numbers with or without duplicates.
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Shoe Size Converter (UK/EU/US)

Convert shoe sizes between UK, EU, US (men and women) and centimetres.
R

Ratio Calculator — Simplify & Solve

Divide an amount by a given ratio. Simplify ratios and see percentage splits.
T

Temperature Converter

Convert between Celsius, Fahrenheit and Kelvin instantly. Includes common temperature reference points and conversion formulas.
L

Length Converter — Metric & Imperial

Convert between mm, cm, metres, km, inches, feet, yards and miles. Includes feet & inches display.
A

Area Converter (m² / ft² / acres)

Convert between square metres, square feet, acres, hectares and more. Includes all common UK area units with instant results.
C

Cooking Measurement Converter

Convert between ml, cups, tablespoons, pints and ounces. Includes gas mark to °C/°F chart.
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Time Zone Converter

Convert times between 15+ world time zones. See all zones at a glance.
C

Clothing Size Converter (UK/EU/US)

Convert clothing sizes between UK, EU and US for women and men. Includes body measurements.
V

Volume Converter — Litres, Gallons & More

Convert between ml, litres, pints, gallons, cups, tablespoons and cubic metres.
B

Birthday Calculator

Find your day of birth, star sign, Chinese zodiac, days alive and upcoming milestone birthdays.
W

Wedding Cost Calculator (Detailed)

Calculate detailed wedding costs across 17 categories with per-guest items. See cost per guest.
T

Time Duration Calculator

Calculate hours and minutes between two times. Includes decimal hours for timesheets.
S

Split Bill Calculator

Split a bill between multiple people with itemised costs. Add people and items dynamically.
S

Speed, Distance & Time Calculator

Calculate speed, distance or time from the other two. Miles and km with the SDT triangle formula.