Noise Level Combination Calculator – Combine dB Levels Accurately (OSHA/NEBOSH Tool)

🔊 Noise Level Combination Calculator

Noise Level 1 (dB): Noise Level 2 (dB):

📘 This calculator uses standard dB correction factors (OSHA/NEBOSH) to estimate combined noise level.

Difference	Add to Higher Level
0 dB	+3.0 dB
1 dB	+2.5 dB
2 dB	+2.1 dB
3 dB	+1.8 dB
4 dB	+1.5 dB
5 dB	+1.2 dB
6 dB	+1.0 dB
7–9 dB	+0.7 dB
≥10 dB	+0 dB

📊 Basic Rules for Working with Decibels

Change in dB	Change in Sound Energy
3 dB increase	Sound energy is doubled
3 dB decrease	Sound energy is halved
10 dB increase	Sound energy is increased by a factor of 10
10 dB decrease	Sound energy is decreased by a factor of 10
20 dB increase	Sound energy is increased by a factor of 100
20 dB decrease	Sound energy is decreased by a factor of 100

Great! You're using the Noise Level Combination Calculator — a useful tool to combine two noise levels (in decibels) and get the effective total noise level.

✅ How to Use This Tool (Simple Guide)

📌 Purpose:

To combine two different noise levels (in dB) into a single combined dB level, using OSHA/NEBOSH guidelines.

🧩 Step-by-Step Instructions:

🔢 Enter Noise Level 1 (in dB)
- Example: 88
🔢 Enter Noise Level 2 (in dB)
- Example: 85
🔘 Click on "Calculate" button
✅ Result shown:
- It displays the combined noise level in dB based on the difference between the two inputs.

🧠 Behind the Calculation:

The tool uses this logic:

Difference in dB	Add to Higher Level
0 dB	+3.0 dB
1 dB	+2.5 dB
2 dB	+2.1 dB
3 dB	+1.8 dB
4 dB	+1.5 dB
5 dB	+1.2 dB
6 dB	+1.0 dB
7–9 dB	+0.7 dB
≥10 dB	+0.0 dB

📌 The larger of the two levels is increased by the amount shown above to get the total combined noise level.

🧾 Example Calculation:

Input	Value
Noise Level 1	88 dB
Noise Level 2	85 dB
Difference	3 dB
Correction	+1.8 dB
✅ Combined	89.8 dB

🎯 Why Use This Tool?

✅ For workplace noise assessment (as per NEBOSH, OSHA)
✅ To plan hearing protection (PPE)
✅ To understand cumulative noise effects
✅ Easy for HSE officers, engineers, and students