How Heavy Is Mars?

Mars weighs about

6.42 × 10^23 kg (7.07 × 10^20 US tons)

Typicaltotal mass of Mars as listed in the NASA/NSSDCA Mars Fact Sheet (0.64169 x 10^24 kg, about 10.7% of Earth's mass)
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Using a log scale so small objects stay visible — the numbers stay real.

  • Mars6.42 × 10^23 kg

    total mass of Mars as listed in the NASA/NSSDCA Mars Fact Sheet (0.64169 x 10^24 kg, about 10.7% of Earth's mass)

  • the Eiffel Tower10,100,000 kg

    official figures published by the tower operator: 7,300 t of metal frame, 10,100 t total including the lifts, shops and antennae (French metric tonnes)

  • a blue whale150,000 kg

    adult; females larger than males; Antarctic subspecies up to 330,000 lb (149,685 kg), North Atlantic/North Pacific over 100,000 lb (45,359 kg)

  • an African elephant4,500 kg

    adult male 4,500–6,100 kg; adult female 2,000–3,500 kg

  • You

Open full comparison → to add more objects on one scale.

Put it in perspective

Why weights differ

This is Mars' mass; a person standing on Mars would weigh about 38% of their Earth weight because surface gravity is only 3.69 m/s2. The fact sheet quotes mass in units of 10^24 kg.

Sources

  1. [1] NASA NSSDCA (NASA Goddard Space Flight Center)

    Mars Fact SheetGovernment agency

    “Mass (10 24 kg) 0.64169 5.9722 0.107”

    Value as published: 0.64169 x 10^24 kg (Mars), 5.9722 x 10^24 kg (Earth), ratio 0.107 · accessed 2026-11-11.

Last updated 2026-11-11.Report a correction (please include a source link).

Related objects

  • the Moon7.35 × 10^22 kg (8.1 × 10^19 US tons)
  • Earth5.97 × 10^24 kg (6.58 × 10^21 US tons)
  • Saturn5.68 × 10^26 kg (6.26 × 10^23 US tons)
  • Jupiter1.9 × 10^27 kg (2.09 × 10^24 US tons)
  • the Sun1.99 × 10^30 kg (2.19 × 10^27 US tons)
  • Halley's comet (nucleus)302,000,000,000 t (332,000,000,000 US tons)
← Lighter: the Moon (7.35 × 10^22 kg (8.1 × 10^19 US tons))Heavier: Earth (5.97 × 10^24 kg (6.58 × 10^21 US tons)) →

Frequently asked questions

How much does Mars weigh?

Mars weighs about 6.42 × 10^23 kg (7.07 × 10^20 US tons) — total mass of Mars as listed in the NASA/NSSDCA Mars Fact Sheet (0.64169 x 10^24 kg, about 10.7% of Earth's mass).

How much is Mars in pounds and ounces?

1.41 × 10^24 lb, which is 2.26 × 10^25 oz. In metric terms: 6.42 × 10^23 kg.

Is Mars heavier than the Eiffel Tower?

Yes. Mars weighs about 6.42 × 10^23 kg (7.07 × 10^20 US tons), while the Eiffel Tower is about 10,100 t (11,100 US tons) — roughly 63,999,999,999,999,990×.

Why do sources give different weights?

This is Mars' mass; a person standing on Mars would weigh about 38% of their Earth weight because surface gravity is only 3.69 m/s2. The fact sheet quotes mass in units of 10^24 kg.

Where does this number come from?

Every source is listed at the bottom of this page with publisher, link, access date and a verbatim quote. Numbers are only published when a qualifying source can be verified.