Unit conversion guides and charts

The reasoning behind the conversions, written out: why the temperature formula has two steps, what an oven dial really means, and charts you can read a value off without doing the arithmetic at all. Each guide links back to the converters it uses.

• 25 October 2026 How many mL in a cup? US, metric and UK cups Three different cups share the name: 236.6 mL in the US, 250 mL in metric recipes and 284 mL Imperial. Here is which one a recipe means.
• 19 October 2026 How many cups in a quart? US, UK and metric cups Four cups, exactly, for any US liquid quart. Here is the whole gallon-to-cup chart, what changes with UK and metric cups, and the dry quart berries are sold in.
• 19 October 2026 How many mL in an ounce? US, UK and weight ounces Three different things get called an ounce. Here is how many milliliters each one is, a chart for the sizes people look up, and how to tell which ounce a label means.
• 19 October 2026 The Celsius to Fahrenheit formula, explained The formula is multiply by 1.8, then add 32. This guide is about why — which is what stops the usual mistakes, and what tells you when the 32 does not belong.
• 19 October 2026 Oven temperature conversion: Celsius, Fahrenheit and gas marks What 150 °C, 180 °C and 200 °C are in Fahrenheit, which gas mark is which, what “fan” changes, and why the number on the dial is often meaner than the number in the recipe.
• 11 October 2026 Celsius to Fahrenheit chart, −40 to 300 Every value from −40 °C to 300 °C in Fahrenheit, in steps small enough to read between — plus a converter to type into when the chart does not have your number.
• 11 October 2026 Air fryer temperature conversion: oven recipes, adjusted Lower the heat and shorten the time — the working rule for turning an oven recipe into an air fryer one, with starting points in both scales, and the foods where the rule stops working.

Every guide is written against the same conversion engine the site uses, and every number in it is computed rather than copied. If you would rather have the answer than the explanation, the converter pages show the formula, a worked example and a table for the pair you need — and the methodology page lists every factor and where it comes from.