Is −100 dBm a strong or weak signal for LoRa?

For LoRa LPWAN, −100 dBm is considered a good, reliable signal. While a Wi-Fi client would disconnect at this level, LoRa transceivers have receiver sensitivities extending down to −137 dBm (at Spreading Factor 12), giving a −100 dBm link more than 35 dB of operating headroom.

Will Wi-Fi or 4G LTE operate at −100 dBm?

Wi-Fi will disconnect completely, as standard 802.11 receivers drop links below −85 to −90 dBm. In 4G LTE, −100 dBm RSRP represents a 'fair' cell-edge signal (typically 2 to 3 bars on a phone), sufficient for voice over LTE (VoLTE) and moderate data downloads.

What is the equivalent power of −100 dBm in microwatts?

−100 dBm is equal to 0.0001 microwatts (0.1 picowatts, or 1.0 × 10⁻¹³ Watts).

RF Power Milestone Verified: LPWAN / IoT

-100 dBm to Watts Calculator — Exact Power & Voltage Benchmark

-100 dBm equals 1.000e-13 W (1.00e-10 mW). Real-world engineering benchmark: LoRa Long-Range Receiver Sensitivity.

-100 dBm Power Breakdown Hub

LoRa Long-Range Receiver Sensitivity

−10 dB −3 dB (½) Reset (-100 dBm) +3 dB (2×) +10 dB (10×)

Power Level in dBm: -100 dBm

Reference Domain: LPWAN / IoT

Power in Linear Watts: 1.000e-13 W

Milliwatts: 1.00e-10 mW

dBW: -130.00 dBW

Picowatts (pW): 0.10 pW

V_RMS (@ 50Ω) 0.00 mV

Peak-to-Peak (V_pp) 0.01 mV

Voltage (dBµV) 7.0 dBµV

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Rigorous Math

Exact Mathematical Derivation for -100 dBm

Step 1: P(mW) = 10^(-100 / 10) = 10^(-10.00) = 1.000e-10 mW

Step 2: P(W) = 1.00e-10 mW ÷ 1,000 = 1.0000e-13 Watts

Step 3: V_RMS (@ 50Ω) = √(1.000e-13 W × 50 Ω) = 0.00 mV RMS (7.0 dBµV)

Technical Reference & Field Standards

Engineering Deep-Dive: -100 dBm in Real-World Systems

Governing Specification: Semtech SX1276 / LoRa Alliance Regional Parameters

−100 dBm (0.1 picowatt or 1.0 × 10⁻¹³ Watts) is a key benchmark in Long Range (LoRa) and Low-Power Wide-Area Networks (LPWAN), representing robust, long-range reception for sub-GHz smart metering, industrial telemetry, and asset tracking.

At −100 dBm, high-order cellular systems and standard Wi-Fi modulations have long since dropped connection, but Chirp Spread Spectrum (CSS) transceivers (such as the Semtech SX1262/SX1276) maintain zero packet loss with low spreading factors (SF7/SF8). A signal of −100 dBm yields an RMS voltage of 2.236 microvolts across a 50 Ohm termination (+7.0 dBµV).

In commercial LPWAN deployments across the 868 MHz (Europe) and 915 MHz (North America) ISM bands, an RSSI of −100 dBm indicates an established, high-reliability link with over 20 to 30 dB of fade margin before approaching the absolute LoRa demodulation limit (−137 dBm at SF12/125 kHz).

Relative Delta Analysis

Adjacent Relative Power Comparisons

See how power changes when increasing or decreasing from -100 dBm by standard logarithmic step sizes:

Delta (Δ dB)	Resulting Level (dBm)	Physical Effect
-10 dB	-110.0 dBm	1/10th Power
-3 dB	-103.0 dBm	1/2 Half Power
-1 dB	-101.0 dBm	-1 dB Attenuation
0 dB	-100.0 dBm	Baseline Level
+1 dB	-99.0 dBm	+1 dB Increase
+3 dB	-97.0 dBm	2× Double Power
+10 dB	-90.0 dBm	10× Power

All Landmark Benchmarks

Explore Verified RF Power Benchmarks

Browse dedicated engineering references for standardized decibel-milliwatt power milestones across wireless, cellular, broadcast, and satellite domains:

-130 dBm -100 dBm -90 dBm -80 dBm -73 dBm -70 dBm -67 dBm -50 dBm -30 dBm 0 dBm +10 dBm +20 dBm +23 dBm +30 dBm +33 dBm +40 dBm +43 dBm +46 dBm +50 dBm

→ View Complete Integer Reference Table (−140 dBm to +100 dBm)

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Knowledge Base

Frequently Asked Questions: -100 dBm

Common questions about RF power conversions, negative dBm, and voltage calculations.

What is the difference between dB and dBm?

dB (decibel) is a dimensionless ratio comparing two power values (like amplifier gain or cable loss). dBm (decibel-milliwatt) is an absolute power measurement referenced specifically to 1 milliwatt (1 mW). You can add a gain of +3 dB to a signal of +10 dBm to get +13 dBm.

How do you convert negative dBm values to Watts?

Negative dBm simply means the power is less than 1 milliwatt. You use the exact same formula: P(W) = 10^((dBm-30)/10). For example, −30 dBm = 10^((-30-30)/10) = 10^-6 = 1 µW (0.000001 Watts).

Why is 0 dBm equal to 1 milliwatt?

The formula for dBm is 10 · log10(P / 1mW). When the power is exactly 1 mW, P / 1mW = 1. Since log10(1) = 0, 10 × 0 = 0 dBm. 0 dBm does not mean zero power; it represents exactly 1 milliwatt.

How do I convert dBm to RMS voltage at 50 Ohms?

First convert dBm to Watts: P = 10^((dBm-30)/10). Then calculate V_rms = √(P · 50). For example, 0 dBm (0.001 W) at 50Ω yields √(0.001 · 50) = √0.05 ≈ 0.2236 V_rms (223.6 mV).

What is the theoretical thermal noise floor (−174 dBm/Hz)?

Thermal noise power density is governed by Johnson–Nyquist noise formula P = k · T · B, where k is Boltzmann's constant (1.38 × 10^-23 J/K) and T = 290 K room temperature. In a 1 Hz bandwidth, P ≈ 4.0 × 10^-21 W = −174 dBm/Hz.

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