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✦ PLAYFUL SCIENCE

Try It. Test It. Know the Universe.

Interactive space calculators and quizzes.

Try the weight calculator
✦ PICK AN EXPERIMENT

Welcome to Space Lab.

No account needed. Choose a challenge and start exploring.

Gravity lab

Your Weight on Other Planets

How much would you weigh on Mars or Jupiter?

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Time warp

Your Age on Other Planets

Celebrate a birthday on Venus or Neptune.

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Cosmic distances

Space Travel Time

How long does light take to reach another world?

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Just for fun

Which Space Commander Are You?

Strategist, explorer, diplomat or fearless ace?

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A little learning goes a long way.

The science widgets use published or standard approximate values; simplified assumptions are explained on each tool.

✦ FEATURED EXPERIMENT

See how much you weigh on Mars.

INTERACTIVE GRAVITY EXPERIMENT

Your Weight on Other Planets

Enter your Earth weight, then choose a planet to see how gravity changes the reading on a normal Earth-calibrated scale.

kg

Choose a planet

YOUR EQUIVALENT WEIGHT ON MARS28.3 kg

About 38% of your Earth-scale weight

Wait—does your mass actually change?

No! Your mass stays constant. Gravity changes your weight, which is a force. The number above is a familiar kilogram-equivalent scale reading, based on approximate surface gravity ratios. On gas giants, “surface” gravity means a conventional atmospheric reference level.