ScaleTrip

Travel through scale.

Distance library

Choose a distance, compare familiar landmarks and explore the calculation.

Start with a question, understand it with a picture

No need to know the formula first. Look at an example, follow the calculation, then check the evidence.

How far away is the Moon? — conceptual illustration

How far away is the Moon?

Start with two balls and a 3 m gap.

How can we compare things we cannot see? — conceptual illustration

How can we compare things we cannot see?

Split a millimetre into smaller and smaller parts.

How do we know what is inside Earth? — conceptual illustration

How do we know what is inside Earth?

Follow the clues carried by earthquake waves.

Everyday and walking

  1. What does 100 metres look like?A 100-metre distance is the length of the standard outdoor sprint straight. It is short enough to see end to end, but long enough for a fast runner to need several seconds to cross it.0.1 km
  2. How far is 500 metres?Five hundred metres is half a kilometre. In a dense city it can span several blocks, while vertically it sits close to the height range of the tallest skyscrapers.0.5 km
  3. How far is 1 kilometre?One kilometre equals 1,000 metres or about 0.621 miles. It is a familiar neighbourhood distance and a useful baseline for larger journeys.1 km
  4. How far is 5 kilometres?Five kilometres is a common road-race distance. It reaches beyond a single neighbourhood and is long enough for terrain and route choice to noticeably change travel time.5 km
  5. How far is 10 kilometres?Ten kilometres equals 10,000 metres or roughly 6.21 miles. It is a substantial run and a cross-city trip in many urban areas.10 km

City and regional

  1. How far is 20 kilometres?Twenty kilometres is close to a half-marathon but still 1.0975 kilometres short of the official race distance. It often represents a long commute across a metropolitan area.20 km
  2. How far is a marathon?The official marathon distance is 42.195 kilometres, or about 26.219 miles. The unusual final 195 metres are part of the standardized race length.42.195 km
  3. How far is 100 kilometres?One hundred kilometres equals 100,000 metres or about 62.14 miles. It is a regional journey rather than a local trip.100 km
  4. How far is 500 kilometres?Five hundred kilometres is about 310.69 miles. It is a regional or cross-border scale rather than a local journey.500 km
  5. How far is 1,000 kilometres?One thousand kilometres is about 621.37 miles. It spans broad regions and is easier to picture through geography than through buildings or city blocks.1,000 km

Earth and space

  1. How large is Earth's radius?ScaleTrip uses 6,371 kilometres as a rounded mean Earth radius. A radius runs from Earth's centre to its surface; diameter crosses the centre and circumference follows the surface.6,371 km
  2. How wide is Earth?ScaleTrip uses 12,742 kilometres as Earth's rounded mean diameter. Diameter is the straight line through Earth's centre from one side of the surface to the other.12,742 km
  3. How far is Earth's circumference?Earth's equatorial circumference is approximately 40,075 kilometres. It is the curved distance around the equator.40,075 km
  4. How high is geostationary orbit?Geostationary orbit is about 35,786 kilometres above Earth's equator. The value measures altitude above the surface; orbital radius is measured from Earth's centre.35,786 km
  5. How Far Is the Moon From Earth?The Moon is about 384,400 kilometres (238,855 miles) from Earth on average, measured from centre to centre. The distance varies along the Moon's elliptical orbit.384,400 km
  6. How wide is the Sun?ScaleTrip uses about 1,392,000 kilometres for the Sun's diameter. Diameter measures across the Sun through its centre and is twice the listed radius.1,392,000 km
  7. How far is Earth from the Sun?The average Earth–Sun distance is about 149.6 million kilometres, defined approximately by one astronomical unit. Earth's elliptical orbit makes the actual separation vary.149,600,000 km