One mile is 1.609 Kilometers.   One KM is 0.621 miles.   But the better answer would be 1.609344 kilometers in a mile.
Keep in mind that the information on your credit reports may not change every time you update them on Credit Karma. It usually takes about 30 days for creditors to report new information (like new balances or payment activity) to the credit bureaus, and the frequency of updates can vary by creditor.
Put another way, Credit Karma members with scores that top 750 have an average age of open accounts of 7.5 years. While there is no magic number or threshold here, it is fairly clear that a great credit score does usually take some time.