How many km is 3 AU?
3 AU = 448,793,612 km
It is 448,793,612 km, so saying 448,793,612 km is fine — rounding is within 0.5%.
And how many AU is 3 km?
3 km = 0 AU
Formula: km = AU × 149,597,870.7
AU to km around this value
1.2 AU179,517,445km
1.4 AU209,437,019km
1.6 AU239,356,593km
1.8 AU269,276,167km
2 AU299,195,741km
2.2 AU329,115,316km
2.4 AU359,034,890km
2.6 AU388,954,464km
2.8 AU418,874,038km
3 AU448,793,612km
3.2 AU478,713,186km
3.4 AU508,632,760km
3.6 AU538,552,335km
3.8 AU568,471,909km
4 AU598,391,483km
4.2 AU628,311,057km
4.4 AU658,230,631km
4.6 AU688,150,205km
4.8 AU718,069,779km
5 AU747,989,354km