Enter the take-off roll (m), the thinking time distance (m), and the resolution distance (m) into the Balanced Field Length Calculator. The calculator will evaluate the Balanced Field Length.

## Balanced Field Length Formula

The following formula is used to calculate the Balanced Field Length.

BFL = TO + TTD + RD

• Where BFL is the Balanced Field Length (m)
• TO is the take-off roll (m)
• TTD is the thinking time distance (m)
• RD is the resolution distance (m)

## How to Calculate Balanced Field Length?

The following two example problems outline the steps and information needed to calculate the Balanced Field Length.

Example Problem #1

1. First, determine the take-off roll (m).
• The take-off roll (m) is calculated to be : 1000.
2. Next, determine the thinking time distance (m).
• The thinking time distance (m) is measured to be: 100.
3. Next, determine the resolution distance (m).
• The resolution distance (m) is found to be: 500.
4. Finally, calculate the Balanced Field Length using the formula above:

BFL = TO + TTD + RD

The values provided above are inserted into the equation below and computed.

BFL = 1000 + 100 + 500 = 1600 (m)

Example Problem #2

The variables required for this problem are provided below:

take-off roll (m) = 2000

thinking time distance (m) = 200

resolution distance (m) = 20000