Sound - Ldn - Day and Night Level

Calculate the EPA Day-Night Sound Level (Ldn) based on daytime and nighttime equivalent sound levels. The Ldn is an A-weighted equivalent sound level for a 24-hour period with an additional 10 dB imposed on nighttime hours (10 pm to 7 am).

Calculator

Inputs

Ld - Daytime Equivalent Sound Level (dB)

Daytime Hours (h)

Ln - Nighttime Equivalent Sound Level (dB)

Nighttime Hours (h)

Results

Ldn - Day-Night Sound Level-- dBA