5 free tools
Free online converters and calculators
These converters and calculators answer the quick everyday questions: what an amount is worth in another currency, how many grams are in a cup of flour, which shoe size to order from a foreign shop, and when a prescription will run out. Each page shows the result together with the rate, factor or formula behind it, so you can check the working.
- Currency converterECB rates for USD, EUR, GBP, INR and more, one page per pair.
Currency Converter : FastOpen - Units converterCommon conversions with the factor and a worked example.
Units Converter & CalculatorOpen - Cups to gramsCups and spoons to grams for 27 baking ingredients.Units Converter & CalculatorOpen
- Shoe size converterUS, UK and EU sizes for men, women and kids.Units Converter & CalculatorOpen
- Days supply calculatorWhen your pills run out and when to request a refill.
Daily Pills | ReminderOpen
About these tools
The currency converter uses the reference rates published by the European Central Bank for 22 currencies, including the US dollar, euro, British pound, Indian rupee, Japanese yen and Australian dollar. Every pair has its own page with the number on it, and the most searched pairs also have pages for common amounts such as 100 or 1,000. The rate date is printed on the page. ECB rates are set once each working day, so a bank or card provider will quote a slightly different figure.
The units converter covers the conversions people look up most: distance, weight, volume, area, speed, data, time, pressure, fuel economy and temperature. Each page gives the factor or formula and a worked example. Data sizes use binary units, so 1 GB is 1,024 MB.
Cups to grams converts cups, tablespoons and teaspoons to grams, and back, for 27 baking ingredients. A cup measures volume, so a cup of flour and a cup of sugar weigh different amounts. You can choose a US, metric or old UK cup, and fractions such as 1/2 or 1 1/3 work.
The shoe size converter moves between US, UK and EU sizes for men, women and children, compares men's and women's sizes, and finds a size from your foot length in centimetres or inches.
The days supply calculator divides the number of pills dispensed by the amount taken each day. It gives the number of days a supply lasts, the date it runs out and when to ask for a refill, and it can add a refill reminder to your calendar. It is arithmetic only: it does not suggest doses, and your prescriber's or pharmacist's directions come first.
The interactive calculators work inside the page, with no sign-up.
Questions
Where do the currency rates come from?
They are the euro reference rates published by the European Central Bank, which most free converters use. The date of the rates is shown on every page. Banks and card providers add their own margin, so the amount you are charged will differ slightly.
Why do cups to grams depend on the ingredient?
A cup measures volume and a gram measures weight. A US cup of all-purpose flour weighs about 120 g, while the same cup of granulated sugar weighs about 198 g, so you need to pick the ingredient first.
Is the days supply calculator medical advice?
No. It only divides the quantity you have by the amount you take per day and adds the dates to a calendar. Always follow the directions from your prescriber or pharmacist.