The formula used to convert 140 celsius to fahrenheit and find its value is- (C * 9/5) + 32 = F.

So, now to convert it using the formula, we just need to put the value of C=140 in the above formula ie. ( 140 * 9/5 ) +32 = F.

And now just calculate it further by first multiplying 140 by 9 and then dividing the obtained product by 5. Now add the number to 32 to get the final value in fahrenheit.

Thus, 140 C to F will be equal to 284 fahrenheit.