EPRE Calculator
Calculate the average Energy Per Resource Element (EPRE) from the total transmit power and the number of active resource elements. This simplified calculator assumes transmit power is evenly distributed across all active REs.
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Inputs
Live
Math
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Related
Enter parameters and click Calculate to view results
Formula & Theory
EPRE (dBm/RE) = Total Power (dBm) − 10 × log₁₀(Number of Active REs)This formula is used to calculate antenna parameters for epre calculator.
Overview
Use this EPRE calculator to estimate the average transmit power allocated to each active resource element in LTE and 5G NR. EPRE is commonly used when configuring reference signals, synchronization signals, and physical channels.
Input Guide
Enter Total Transmit Power, Active Resource Elements exactly in the units shown by this epre. Check the operating band, unit prefix, and decimal position before calculating; these are the inputs used by the formula.
- Total Transmit Power — use dBm.
- Active Resource Elements.
Output Guide
The results describe the calculated 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 EPRE uses EPRE (dBm/RE) = Total Power (dBm) − 10 × log₁₀(Number of Active REs). Supply Total Transmit Power (dBm), Active Resource Elements in the displayed units, then use the calculated values as the first engineering target for this 5g nr design or analysis.
Design Notes
EPRE assumes that the total transmit power is uniformly distributed over all active resource elements. In practical networks, individual channels and reference signals may apply additional power offsets.
Build and Tuning Notes
3GPP specifications frequently express transmit power relationships using EPRE. Physical channels such as PDSCH, PBCH, DM-RS, CSI-RS, and SSB may use configured EPRE offsets relative to other signals.
Frequently Asked Questions
What is EPRE?
Energy Per Resource Element (EPRE) represents the average transmit power assigned to a single resource element in an OFDM resource grid.
Why is EPRE important?
EPRE is used when configuring and comparing the transmit power of physical channels and reference signals in LTE and 5G NR systems.
Does this calculator include channel-specific power offsets?
No. This calculator assumes equal power distribution across all active resource elements and does not apply channel-specific EPRE offsets defined by network configuration.
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.