Astronomical Unit to Kilometer Converter

How it is calculated

Two straight multiplications: km = AU × 149,597,870.7 and miles = AU × 92,955,807.3, where AU is the distance in astronomical units. Both results are rounded to two decimals, so very small inputs lose precision: 0.0000001 AU shows as 14.96 km. The tool accepts zero and negative numbers (a negative distance is simply mirrored with a minus sign, which only makes sense for a signed offset along an axis). Text that is not a number gives no result. The conversion factor is a fixed constant, so there is no country or year dependency.

Common mistakes

• Confusing AU with light-years: one light-year is about 63,000 AU, so a value meant in light-years gives a wildly wrong answer.
• Typing a distance already in kilometres into the AU field; the result then multiplies by about 150 million.
• Using the rounded figure 150 million km for precise work; the tool applies 149,597,870.7 km.
• Reading the two-decimal output as higher precision than the input justifies; 1.5 AU for Mars is itself an approximation.
• Typing a decimal comma (5,2): the engine returns no result for it, so write 5.2 with a point.