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Free calculators with sourced answers
Free, sourced calculators for the kitchen, home, crafts and calendar. Each tool shows its formula, a worked example and the sources behind its reference data.
Most used
Popular calculators
- Cups to Grams Converter (by Ingredient)Convert US cups to grams for flour, sugar, butter, milk and 13 more ingredients using King Arthur Baking's weight chart. Fractions accepted.
- Paint Calculator for Walls (Gallons or Litres)Work out how much paint you need for a room from its perimeter, wall height, doors, windows and coats, in US gallons or litres.
- Oven Temperature Converter (Fahrenheit, Celsius, Gas Mark)Convert oven temperatures between Fahrenheit, Celsius and UK Gas Mark, with a fan-oven adjustment and a printable conversion chart.
- Days Between Dates CalculatorCount the number of days, weeks and weekdays (Monday to Friday) between two dates, with an option to include the end date.
- Yarn Calculator for Knitting & Crochet BlanketsEstimate how much yarn a blanket, scarf or shawl needs from a gauge swatch, in grams or yards, and how many skeins to buy.
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Calculators by category
- Cooking & BakingConvert cups to grams by ingredient, oven temperatures and Gas Marks, with sourced reference data.2 tools
- Home & DIYEstimate materials for home projects such as paint, with clear formulas and adjustable assumptions.1 tool
- CraftsEstimate yarn for blankets and other projects using Craft Yarn Council weight categories.1 tool
- Date & TimeCount calendar days and business days between two dates.1 tool
- Unit ConversionEveryday length and weight conversions such as inches to centimeters and pounds to kilograms.Coming soon