If you could put planet Earth on a bathroom scale, how many kilograms would it show?
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Answer
About 6,000,000 quintillion kg
Earth gains tens of thousands of tonnes of cosmic dust every year, yet it also leaks hydrogen and helium into space, so overall it is getting very slightly lighter.
How to estimate it
Earth's radius is 6,400 km, or 6.4 million metres. The volume of a sphere is 4.19 × r³, so 4.19 × 2.6 × 10^20 gives about 1.1 × 10^21 cubic metres. Surface rock weighs 3,000 kg per cubic metre and the iron core far more, so take 5,000 on average. 1.1 × 10^21 × 5,000 = 5.5 × 10^24 kg. The measured mass is about 6 × 10^24 kg.
Source: NASA Earth Fact Sheet
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