Cooking & DIY/Home Calculators
Free cooking and DIY home calculators: recipe scaling, oven temperature conversion, cooking measurements, shoe and clothing size conversion, fuel economy and cost, paint, tile, wallpaper, concrete and floor area. Locale-aware size converters that follow your site language.
Cooking and home projects are full of small conversions and quantity sums that decide whether a dish or a DIY job comes out right — scaling a recipe, reading a foreign oven setting, buying enough paint or tiles, or ordering shoes and clothes across borders. The Cooking & DIY/Home Calculators hub brings together the everyday maths of the kitchen and the home, each running entirely in your browser with no sign-up and no data stored.
Each calculator has its own page with a clear explanation of the method, sensible default values, and answers to common questions. The supporting guides go deeper into the concepts — how cooking measurements really convert, how oven temperature scales including fan settings relate, how to measure a room for flooring, and how paint coverage changes by surface. The results are estimates for planning; sizes, coverage and material yields vary by product and surface, so confirm the numbers with your supplier or the product label before buying.
Calculators
- Recipe Scaling CalculatorScale a recipe up or down for any number of servings. Enter the original servings, the servings you want and an ingredient amount to get the scaled quantity instantly.
- Oven Temperature ConverterConvert oven temperatures between Celsius, Fahrenheit, gas mark and fan-assisted settings. Enter one value and see every equivalent for any recipe.
- Cooking Measurement ConverterConvert cooking measurements between cups, tablespoons, teaspoons, millilitres, fluid ounces and grams of water. Exact, internationally defined factors for reliable recipes.
- Shoe Size ConverterConvert your foot length to shoe sizes worldwide. The target region follows your site language — EU for German, JP for Japanese, US for English — so you get the locally correct size.
- Clothing Size ConverterConvert your chest or bust measurement to clothing sizes worldwide. The target region follows your site language — EU for German, JP for Japanese, US for English — for the locally correct size.
- Fuel Economy ConverterConvert fuel economy between L/100km, US mpg, UK mpg and km/L. Enter a value in one unit and see the equivalent in every other common measure.
- Fuel Cost per Trip CalculatorEstimate the fuel cost of a trip. Enter the distance, your vehicle’s fuel economy and the fuel price to see the fuel used and the total cost in any currency.
- Paint Quantity CalculatorWork out how much paint a room needs. Enter the wall area (or room dimensions), number of coats and paint coverage to get the litres and cans to buy.
- Tile Quantity CalculatorCalculate how many tiles and boxes you need. Enter the floor or wall area, tile size and wastage to get the tile count and the boxes to buy.
- Wallpaper Roll CalculatorCalculate how many wallpaper rolls to buy. Enter the wall dimensions, roll size and pattern repeat to get the roll count allowing for pattern matching.
- Concrete Volume CalculatorCalculate concrete volume for a slab, footing or post hole. Enter the dimensions to get cubic metres, cubic yards and the number of premix bags to buy.
- Floor Area CalculatorCalculate the floor area of a room in square metres and square feet. Enter the room dimensions and a wastage allowance for flooring, carpet or tiles.
Supporting guides
- Cooking Conversions ExplainedUnderstand cooking measurement conversions: the US vs metric cup, level spoons, the water-to-grams shortcut, and why dry ingredients need a scale, not a converter.
- Oven Temperatures Including Fan SettingsA complete guide to oven temperature scales: Celsius, Fahrenheit, gas mark and fan-assisted settings, how they relate, and how to convert any recipe to your oven.
- How to Measure a Room for FlooringStep-by-step guide to measuring a room for flooring, carpet or tiles: how to take the dimensions, allow for wastage, handle irregular rooms and order in the right unit.
- Paint Coverage by Surface TypeUnderstand how much paint different surfaces need: bare plaster, drywall, wood, metal and previously painted walls, and how surface type changes coverage and coats.
How these calculators work
Recipe scaling & cooking conversions
The recipe scaler multiplies every ingredient by the ratio of desired to original servings. The cooking measurement converter uses exact US customary factors (1 cup = 240 ml, 1 tbsp = 15 ml) and a water-to-grams shortcut. The oven converter reduces every scale to Celsius and applies the gas-mark table and a 20°C fan adjustment.
Locale-aware size converters
The shoe and clothing size converters start from a physical measurement (foot length, chest or bust) and default the target region to your site language — EU for German, JP for Japanese, US for English — so the first result is the locally correct size. A selector lets you convert into any other system.
Fuel economy & trip cost
The fuel economy converter moves between L/100km, US and UK mpg and km/L through a common litres-per-100km base. The trip cost calculator works in kilometres and litres internally, so mixed units (miles with L/100km) work correctly, and returns the fuel used and total cost.
DIY quantity & area
The paint, tile, wallpaper, concrete and floor-area calculators turn dimensions into a buyable quantity — litres and cans, tiles and boxes, rolls, cubic metres and bags, square metres and feet — each with a wastage allowance and rounded up to whole units so the job is done in one purchase.
These tools provide general estimates only. Paint coverage, tile yields, concrete volumes, fuel economy and clothing and shoe sizes vary by product, surface, vehicle and brand. Always verify with your supplier, the product label or the brand’s own size chart before buying or acting.