## Conversion formula

The conversion factor from kilometers per hour to miles per hour is 0.62137119223783, which means that 1 kilometer per hour is equal to 0.62137119223783 miles per hour:

1 km/h = 0.62137119223783 mph

To convert 680 kilometers per hour into miles per hour we have to multiply 680 by the conversion factor in order to get the velocity amount from kilometers per hour to miles per hour. We can also form a simple proportion to calculate the result:

1 km/h → 0.62137119223783 mph

680 km/h → V(mph)

Solve the above proportion to obtain the velocity V in miles per hour:

V(mph) = 680 km/h × 0.62137119223783 mph

V(mph) = 422.53241072173 mph

The final result is:

680 km/h → 422.53241072173 mph

We conclude that 680 kilometers per hour is equivalent to 422.53241072173 miles per hour:

680 kilometers per hour = 422.53241072173 miles per hour

## Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 mile per hour is equal to 0.0023666823529393 × 680 kilometers per hour.

Another way is saying that 680 kilometers per hour is equal to 1 ÷ 0.0023666823529393 miles per hour.

## Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred eighty kilometers per hour is approximately four hundred twenty-two point five three two miles per hour:

680 km/h ≅ 422.532 mph

An alternative is also that one mile per hour is approximately zero point zero zero two times six hundred eighty kilometers per hour.

## Conversion table

### kilometers per hour to miles per hour chart

For quick reference purposes, below is the conversion table you can use to convert from kilometers per hour to miles per hour

kilometers per hour (km/h) miles per hour (mph)
681 kilometers per hour 423.154 miles per hour
682 kilometers per hour 423.775 miles per hour
683 kilometers per hour 424.397 miles per hour
684 kilometers per hour 425.018 miles per hour
685 kilometers per hour 425.639 miles per hour
686 kilometers per hour 426.261 miles per hour
687 kilometers per hour 426.882 miles per hour
688 kilometers per hour 427.503 miles per hour
689 kilometers per hour 428.125 miles per hour
690 kilometers per hour 428.746 miles per hour