Your WiFi drops when the microwave runs because microwave ovens operate near 2.4 GHz, the same frequency band many WiFi networks use, and the small amount of energy that leaks from the oven interferes with the signal. This mainly affects 2.4 GHz WiFi. Switching devices to the 5 GHz band or moving the router usually solves it.
Why this happens
- Shared frequency: Microwaves heat food using energy around 2.45 GHz, which overlaps with 2.4 GHz WiFi channels.
- Shielding leakage: Ovens are shielded, but a small amount of energy escapes, and even a little is enough to drown out nearby WiFi.
- Proximity: The closer the router or device is to the microwave, the stronger the interference.
- 2.4 GHz only: The 5 GHz band is well away from microwave frequencies, so it is usually unaffected.
Is this normal?
Yes, this is a well known and expected effect. Many 2.4 GHz devices near a microwave will slow or drop while it runs, then recover afterward.
Does it cause any problems?
Only while the microwave is on. It does not damage your router or devices, but it briefly interrupts browsing, calls, or streaming on 2.4 GHz.
How to fix or check it
- Connect your important devices to the 5 GHz band, which the microwave does not interfere with.
- Move the router away from the kitchen and keep it clear of the microwave.
- Change your 2.4 GHz WiFi channel in the router settings, since channels 1, 6, or 11 are the standard non overlapping choices.
- Keep devices you use during cooking closer to the router or on 5 GHz.
- If the oven is old or the leakage seems severe, have it checked, since a damaged door seal can leak more than normal.
- For whole home coverage, consider a dual band router or mesh system so devices can favor 5 GHz.
Frequently asked questions
Is microwave WiFi interference dangerous?
No. The leakage is tiny and within safety limits. It only disrupts 2.4 GHz radio signals, it does not harm you or your devices.
Does 5 GHz fix the problem?
Usually yes. The 5 GHz band is far from microwave frequencies, so devices on it rarely drop when the oven runs.
Could my microwave be faulty?
If interference is unusually strong, a worn door seal may leak more energy. It is worth having an older oven inspected.