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To convert Earth masses to kg: multiply by 5.9722 × 10²⁴.
M⊕ = 5.9722 × 10²⁴ kg ≈ 5.972 Yg (yottagrams). Earth = 1 M⊕ by definition.
For example, 1 Earth's Mass (M⊕) = 5.972200e+15 Teragram (Tg).
| Earth's Mass (M⊕) | Teragram (Tg) |
|---|---|
| 0.1 | 5.972200e+14 |
| 0.5 | 2.986100e+15 |
| 1 | 5.972200e+15 |
| 2 | 1.194440e+16 |
| 5 | 2.986100e+16 |
| 10 | 5.972200e+16 |
| 25 | 1.493050e+17 |
| 50 | 2.986100e+17 |
| 100 | 5.972200e+17 |
| 500 | 2.986100e+18 |
| 1000 | 5.972200e+18 |
The Earth mass is the mass of planet Earth, approximately 5.972 × 10²⁴ kilograms.
M⊕ = 5.9722 × 10²⁴ kg ≈ 5.972 Yg (yottagrams). Earth = 1 M⊕ by definition.
To convert Earth masses to kg: multiply by 5.9722 × 10²⁴.
Expressing exoplanet masses (e.g., 'a planet of 3 Earth masses'), moon masses, and asteroid masses.
Earth gains about 40,000 tonnes of mass per year from cosmic dust — but that's only 10⁻¹⁷ of its total mass.
Earth's mass is hard to visualize. The key insight: it's known from G × M⊕ (the gravitational parameter), not M⊕ alone.
Cavendish 'weighed the Earth' by measuring G. If you know g (9.8 m/s²) and Earth's radius, you can calculate M⊕ = gR²/G.
The teragram equals 10¹² grams or one million tonnes (one megatonne).
1 Tg = 10¹² g = 10⁹ kg = 10⁶ tonnes = 1 megatonne.
To convert Tg to tonnes: multiply by 10⁶. To convert Tg to Gg: multiply by 1,000.
Global carbon budgets (~10,000 Tg C/year from fossil fuels), volcanic eruption plume masses.
Earth's atmosphere has a total mass of about 5.15 × 10⁶ Tg (5.15 × 10¹⁸ kg).
Confusing Tg with Pg (petagram): 1 Pg = 1,000 Tg. Climate papers use both — check carefully.
Global CO₂ emissions ≈ 36,000 Tg/year (or 36 Pg/year). This is a key climate number to remember.



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