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Astronomical Unit Calculator

Use this astronomical unit calculator to translate solar-system distances into everyday distance units without losing the AU reference.

Catalog QA baseline June 6, 2026Free toolSource note included

Live converter

Astronomical units

Converted distance149,597,870.7

1 astronomical units to kilometers.

Astronomical units1 AU

149,597,870.7 kilometers.

Miles92,955,807.3 mi

149,597,870,700 meters.

AU reference
ReferenceValue
1 AU149,597,870,700 m
1 AU149,597,870.7 km
1 AUAbout 92,955,807.3 mi

Quick answer

Astronomical Unit Calculator: what it calculates

Astronomical Unit Calculator calculates converted astronomy distance from distance, from unit, and to unit. The visible formula is 1 AU = 149,597,870,700 meters exactly.

ResultConverted astronomy distance
InputsDistance, From unit, To unit
FormulaAstronomical unit formula

Formula

Astronomical unit formula

1 AU = 149,597,870,700 meters exactly

The calculator uses the IAU fixed astronomical unit and then applies standard length conversions.

How to use

Steps

  1. Enter the distance value.
  2. Choose whether the input is in AU, kilometers, meters, or miles.
  3. Choose the target distance unit.
  4. Use the reference outputs to compare the same distance across common astronomy units.

Example

Sample calculation

Input1 AU
Kilometers149,597,870.7 km
MilesAbout 92,955,807.3 mi

Calculator use

Best for

  • Use this astronomical unit calculator to translate solar-system distances into everyday distance units without losing the AU reference.
  • Reviewing the visible formula and assumptions before relying on the converted astronomy distance.
  • Comparing the output with the sample calculation and benchmark table before using it elsewhere.
  • Quick everyday math with the result and formula in one place.

Before relying on it

Check first

  • Using the converted astronomy distance before confirming the visible inputs match the same task and context: distance, from unit, and to unit.
  • Ignoring that the calculator uses the IAU fixed astronomical unit and then applies standard length conversions.
  • Skipping the source notes when the formula, benchmark, or warning depends on outside context.
  • Mixing units, dates, or original values across the same calculation.

Details

What to know before using the result

AU basis149,597,870,700 m

The astronomical unit is a fixed conventional length used for solar-system distances.

Best useLarge distance comparison

AU keeps planetary-scale distances readable while kilometers and miles help with familiar comparisons.

PrecisionRound for communication

Keep only the significant figures your source distance supports.

Source notes

References used for this calculator

International Astronomical UnionDefines the astronomical unit as exactly 149,597,870,700 meters.NIST SI GuideLists standard length conversion factors used for meter, kilometer, mile, and related units.

Benchmarks

How to read the result

1 AU: 149,597,870.7 km.

Solar-system distance reference.

0.5 AU: 74,798,935.35 km.

Useful fractional-AU check.

1 AU: About 92.96 million miles.

Common U.S. customary comparison.

Calculator accuracy

Methodology and assumptions

Formula

1 AU = 149,597,870,700 meters exactly

Inputs used

Distance, From unit, To unit

Limitations

Everyday results are quick planning checks. Unit choices, rounding, labels, measurements, local prices, and real-world constraints can change the final decision.

Catalog QA baseline

June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Astronomical Unit Calculator. Page version June 6, 2026. https://toolkitshelf.com/tools/astronomical-unit-calculator

FAQ

Common questions

What is one astronomical unit?

One astronomical unit is exactly 149,597,870,700 meters by IAU definition.

Is an AU the exact Earth-Sun distance?

No. It is a fixed reference length. Earth's actual distance from the Sun varies through its orbit.

When should I use AU instead of kilometers?

Use AU when solar-system distances become too large to scan comfortably in kilometers or miles.