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How much water should you drink a day for your weight? Use 30-35 ml per kg, with NHS, EFSA and US guidance, worked examples and a free water calculator.

How many bulk bags of gravel per square metre? A coverage table by depth, metric and imperial worked examples, and a free gravel calculator.

How much concrete do I need for fence posts? Hole sizes, bags per post, metric and imperial worked examples, and a free concrete calculator.

How to calculate your one-rep max from a set of reps using Epley and Brzycki, with kg and lb worked examples and a free one rep max calculator.

TDEE vs BMR explained: what each number means, how to calculate both with worked examples, and which to use for your daily calorie target.

Convert min/km to min/mile and back with one simple rule, worked examples, a 5K-to-marathon pace chart and a free athletic pace converter.

How to calculate molecular weight step by step, with worked examples for water, glucose, brackets and hydrates, plus a free molecular weight calculator.

Convert scientific notation to decimal step by step, with worked examples and a free converter tool.

UK gallons vs US gallons explained: 4.54609 L against 3.785412 L. Conversion table, worked mpg and fuel examples, plus a free volume converter.

Built-up area vs carpet area vs plot area explained, with a worked example, loading factors and the UK and US equivalents of each measurement.