## 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 420 kilometers per hour into miles per hour we have to multiply 420 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

420 km/h → V(mph)

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

V(mph) = 420 km/h × 0.62137119223783 mph

V(mph) = 260.97590073989 mph

The final result is:

420 km/h → 260.97590073989 mph

We conclude that 420 kilometers per hour is equivalent to 260.97590073989 miles per hour:

420 kilometers per hour = 260.97590073989 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 0.0038317714285684 × 420 kilometers per hour.

Another way is saying that 420 kilometers per hour is equal to 1 ÷ 0.0038317714285684 miles per hour.

## Approximate result

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

420 km/h ≅ 260.976 mph

An alternative is also that one mile per hour is approximately zero point zero zero four times four hundred twenty 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)
421 kilometers per hour 261.597 miles per hour
422 kilometers per hour 262.219 miles per hour
423 kilometers per hour 262.84 miles per hour
424 kilometers per hour 263.461 miles per hour
425 kilometers per hour 264.083 miles per hour
426 kilometers per hour 264.704 miles per hour
427 kilometers per hour 265.325 miles per hour
428 kilometers per hour 265.947 miles per hour
429 kilometers per hour 266.568 miles per hour
430 kilometers per hour 267.19 miles per hour