# Speed of Boat in Still Water Calculator

The water that stays till without flowing is called as the still water. The speed of the boat in still water will vary from the stream water. But based on the speed in the stream, the boat speed in still water can be calculated. Here is the speed of boat in still water calculator which provides you the speed in still water and stream rate based on the speed of the boat in upstream and downstream. This tool fetches result based on the commonly used speed in still water formula.

The water that stays till without flowing is called as the still water. The speed of the boat in still water will vary from the stream water. But based on the speed in the stream, the boat speed in still water can be calculated. Here is the speed of boat in still water calculator which provides you the speed in still water and stream rate based on the speed of the boat in upstream and downstream. This tool fetches result based on the commonly used speed in still water formula.

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#### Formula:

Speed in still water (km/hr)= (1 / 2) (a + b)
Rate of stream (km/hr)= (1 / 2) (a - b)
**Where,**
a = Downstream (km/hr)
b = Upstream speed (km/hr)

### Example:

Calculate the speed of boat in still water with the speed in downstream of 50 km/hr and upstream of 30 km/hr.

#### Solution:

Speed in still water = ( 1 / 2 ) ( 50 + 30 )

= 40 km/hr

Rate of stream = ( 1 / 2 ) ( 50 − 30 )

= 10 km/hr