5G NR SSB Transmit Power & EPRE Calculator
Convert 5G NR SSB EPRE power between dBm, mW, µW, nW, and Watts, and estimate total gNodeB sector RF transmit power.
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Math
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Related
Enter parameters and click Calculate to view results
Formula & Theory
P(mW) = 10^(P_dBm / 10), P(W) = P(mW) / 1000, Total Sector Tx Power ≈ SSB_EPRE + 10 log₁₀(N_subcarriers)This formula is used to calculate antenna parameters for 5g nr ssb transmit power & epre calculator.
Overview
Use this 5G NR SSB power calculator to convert SSB (Synchronization Signal Block) Energy Per Resource Element (EPRE) transmit power across dBm, milliwatts (mW), microwatts (µW), nanowatts (nW), and Watts (W).
Input Guide
Enter SSB EPRE Transmit Power (ss-PBCH-BlockPower), Channel Bandwidth (for Total Sector Power Estimate) exactly in the units shown by this 5g nr ssb transmit power & epre. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- SSB EPRE Transmit Power (ss-PBCH-BlockPower) — use dBm.
- Channel Bandwidth (for Total Sector Power Estimate) — use MHz.
Output Guide
The results describe the calculated 5g nr ssb transmit power & epre values for the inputs you entered. Check each value against the available space, selected components, feed system, and operating conditions before making a final design decision.
How This Calculator Works
The 5G NR SSB Transmit Power & EPRE uses P(mW) = 10^(P_dBm / 10), P(W) = P(mW) / 1000, Total Sector Tx Power ≈ SSB_EPRE + 10 log₁₀(N_subcarriers). Supply SSB EPRE Transmit Power (ss-PBCH-BlockPower) (dBm), Channel Bandwidth (for Total Sector Power Estimate) (MHz) in the displayed units, then use the calculated values as the first engineering target for this 5g nr design or analysis.
Design Notes
In 3GPP TS 38.331 RRC specifications, `ss-PBCH-BlockPower` defines the average EPRE transmit power of the Synchronization Signal Block (expressed in dBm, typically ranging from -60 dBm to +30 dBm depending on macro vs. small cell configurations).
Build and Tuning Notes
An SSB spans 20 Resource Blocks (240 subcarriers). Multiplying the SSB EPRE power per subcarrier by the total active channel subcarriers gives the total wideband RF transmit power of the gNodeB sector amplifier.
Frequently Asked Questions
What is ss-PBCH-BlockPower in 5G NR?
It is the RRC-configured parameter (3GPP TS 38.331) that informs the UE of the transmit power per resource element (EPRE) of the SS/PBCH block, used for downlink path loss estimation and RSRP calculations.
Why is SSB power configured per Resource Element (EPRE)?
Configuring power per subcarrier (EPRE) ensures consistent RSRP measurement benchmarks regardless of total channel bandwidth (20 MHz vs 100 MHz vs 400 MHz).
What is the relationship between SSB EPRE and total gNodeB Tx power?
Total gNodeB wideband transmit power equals SSB EPRE power (in dBm) plus 10×log₁₀ of the total number of subcarriers active across the channel bandwidth.
Alex Warren
B.Sc. in Electrical & Electronic Engineering (EEE)
Alex specialises in antenna design and wave propagation. His expertise helps ensure these calculators present practical RF concepts, useful design estimates, and clear engineering guidance for students, HAM operators, and wireless professionals.