About Astronomical Units to Kilometers Converter
This converter turns astronomical units into kilometers. One astronomical unit is 149597871 kilometers. It is free, needs no sign-up and runs in your browser, so nothing you enter is uploaded.
To convert by hand, multiply the number of astronomical units by 149597871. For example, 10 au × 149597871 = 1,495,978,707 km. To go back, multiply kilometers by 0.0000000066845871. For a rough mental estimate, multiply by about 150000000, which is off by about 0.3 percent.
One astronomical unit is 149,597,870,700 m. Every length unit here is defined from the meter: 1 inch is exactly 25.4 mm, 1 foot is exactly 0.3048 m, 1 mile is exactly 1,609.344 m and 1 nautical mile is exactly 1,852 m. The factor on this page is therefore exact, and only the displayed digits are rounded.
How to use Astronomical Units to Kilometers Converter
- Choose a group such as Length or Temperature from the Quantity picker. It opens on a worked conversion.
- Type the value you want to convert in the From box. Decimals and negative numbers are fine.
- Pick the unit you have in the From list and the unit you want in the To list. The swap button reverses the pair.
- Read the result in the result card, and use the copy button to put it on your clipboard.
- Set Precision to Auto, or to a fixed number of decimals from 0 to 10, if you need a specific rounding.
- Check the formula line and the chart of common values under the result when you want to see how the number was reached.
Features
- 102 units in 15 groups, from nanometers and light-years to square miles, and from bits to tebibytes. It includes milligrams, UK gallons and pints, cubic meters, feet and inches, degrees and radians, hertz and rpm, and bits per second to MB/s.
- Results update as you type, with a swap button to reverse the pair.
- Precision control: Auto (up to 8 significant digits) or 0 to 10 fixed decimals.
- A copy button for the result.
- The formula and the factor in both directions, shown under the result.
- A chart of common values (1, 2, 5, 10, 20, 25, 50, 75, 100, 250, 500 and 1,000) for the pair you chose.
- Temperature handled with proper offset formulas, plus the UK gas mark oven table.
- Fuel economy handled as an inverse, so US and UK miles per gallon and liters per 100 km convert correctly.
- Bangladesh land units: decimal (shotangsho), katha and bigha.
- Both decimal data units (KB, MB, GB, TB) and binary ones (KiB, MiB, GiB, TiB), clearly labeled.
Astronomical units to kilometers formula
To convert astronomical units to kilometers, multiply the value by 149597871.
To go the other way, multiply kilometers by 0.0000000066845871, which is the same as dividing by 149597871.
km = au × 149597871Worked examples
10 au gives 1,495,978,707 km
10 × 149597871 = 1,495,978,707
30 au gives 4,487,936,121 km
30 × 149597871 = 4,487,936,121
Astronomical units to kilometers conversion chart
| Astronomical units (au) | Kilometers (km) |
|---|---|
| 0.5 | 74,798,935 |
| 1 | 149,597,871 |
| 1.5 | 224,396,806 |
| 5.2 | 777,908,928 |
| 10 | 1,495,978,707 |
| 30 | 4,487,936,121 |
| 39.5 | 5,909,115,893 |
| 100 | 14,959,787,070 |
Privacy: how it works
- Every conversion is calculated by code running in your browser tab. The values you type are never sent to Ulkaa or anyone else, and nothing is stored.
- There is no account and no sign-up for this tool, and it costs nothing to use.
Tips
- Use the swap button instead of retyping when you need the reverse conversion.
- For a quick mental check, round the factor: 1 inch is about 2.5 cm, 1 kg is about 2.2 lbs, 1 mile is about 1.6 km.
- Set Precision to 2 decimals for cooking, shopping and travel, and to 6 or more for engineering work.
- Check whether a figure uses US or imperial units before converting volumes, gallons and miles per gallon.
- For land, convert for a rough size, then confirm the area from the deed or survey record.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial and no credit card. Ulkaa Tool does the work with your own device, so there is no server bill to pass on to you.
Do I need an account?
No. There is no sign-up and no login. Open the page and use it. An Ulkaa account is not needed for anything on this tool.
Does it run in my browser?
Yes. Your values are processed by code running in your browser tab, on your own device.
Is my data uploaded?
No. Your values are never sent to Ulkaa or to anyone else. You can check this yourself by watching the Network tab in your browser developer tools while you use the tool.
How many kilometers are in an astronomical unit?
One astronomical unit is 149597871 kilometers.
How many astronomical units are in a kilometer?
One kilometer is 0.00000000668459 astronomical units.
How do I convert astronomical units to kilometers by hand?
Multiply the value in astronomical units by 149597871. For example, 10 au is 1,495,978,707 km. To reverse it, divide by 149597871.
Is the astronomical unit to kilometer factor exact?
Yes. Length units are defined from the meter, and 1 astronomical unit is exactly 149597870700 m. The digits you see on this page are rounded for display only.
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