5G NR Link Budget & RSRP Calculator

A 5G NR link budget helps estimate whether a gNodeB downlink can deliver sufficient signal power to a user equipment (UE). By accounting for transmitter EIRP, path loss, receiver antenna gain, additional losses, channel bandwidth, and receiver noise figure, you can estimate received power, SS-RSRP, thermal noise, and downlink SNR.

The 5G NR Link Budget & RSRP Calculator is designed for quick engineering estimates. Enter the radio and propagation parameters, and the calculator determines the modeled received power and signal-quality indicators without requiring manual logarithmic calculations.

It is useful for preliminary 5G coverage analysis, FWA/CPE planning, antenna comparisons, troubleshooting, and learning how different RF parameters affect a 5G NR downlink.

What Is a 5G NR Link Budget Calculator?

A 5G NR link budget calculator estimates the power available at the receiver after accounting for transmission, propagation, antenna gain, and system losses.

For this calculator, the primary received-power equation is:

Pᵣ = EIRP − PL − L_misc + Gᵣ

Where:

• Pᵣ = total wideband received power in dBm
• EIRP = gNodeB effective isotropic radiated power in dBm
• PL = path loss in dB
• L_misc = penetration and miscellaneous losses in dB
• Gᵣ = UE antenna gain in dBi

The calculator then uses the modeled received power to estimate SS-RSRP, calculate the receiver thermal-noise floor, and determine downlink SNR.

This distinction matters because a 5G signal can have adequate received power while still experiencing unfavorable noise or interference conditions. Conversely, a receiver with better antenna gain or lower noise figure can improve link performance without changing the gNodeB itself.

The calculator is intended as a rapid estimation tool, not as a replacement for detailed 5G NR radio-planning software or field measurements.

What Does the 5G NR Link Budget Calculate?

The calculator produces several outputs that describe different aspects of the modeled downlink.

Total Wideband Received Power

Total received power represents the modeled signal power reaching the UE after path loss and miscellaneous losses are subtracted and receiver antenna gain is added.

The calculation is:

Pᵣ = EIRP − PL − L_misc + Gᵣ

For example, with 62 dBm EIRP, 120 dB path loss, 3 dB miscellaneous loss, and 0 dBi receiver gain:

Pᵣ = 62 − 120 − 3 + 0 = −61 dBm

Estimated SS-RSRP

The calculator estimates reference-signal received power on a per-subcarrier basis. It first estimates the number of subcarriers and then applies a logarithmic offset:

RSRP ≈ Pᵣ − 10 log₁₀(N_subcarriers)

This is a simplified model implemented specifically for this calculator. Actual 5G NR SS-RSRP measurement and resource-grid behavior involve more detailed radio parameters.

UE Thermal Noise Floor

The calculator estimates total thermal noise using:

Noise = −174 + 10 log₁₀(BW_Hz) + NF

The calculation considers channel bandwidth and the UE noise figure.

Downlink SNR

The calculator estimates SNR as:

SNR = Pᵣ − Noise

SNR expresses the modeled relationship between received signal power and noise power in dB.

Coverage Quality Assessment

Finally, the calculator applies its built-in RSRP and SNR thresholds to classify the modeled condition as:

• Excellent
• Fair / Good Coverage
• Poor Coverage
• Cell Edge / Unreliable

These categories are heuristic classifications used by this calculator. They should not be interpreted as universal 5G service-quality standards for every network, UE, frequency band, or deployment.

5G NR Link Budget Formula Explained

Received Power

The central link-budget equation is:

Pᵣ = EIRP − PL − L_misc + Gᵣ

The basic principle is straightforward: start with the effective transmitted power, subtract propagation and other losses, then add receiving antenna gain.

Suppose a 5G macro-cell has:

• EIRP = 62 dBm
• Path loss = 120 dB
• Miscellaneous losses = 3 dB
• UE antenna gain = 0 dBi

Then:

Pᵣ = 62 − 120 − 3 + 0

Pᵣ = −61 dBm

That −61 dBm result becomes the input for the calculator's RSRP and SNR estimations.

Estimated Number of Subcarriers

The calculator uses an approximation of:

Estimated subcarriers ≈ bandwidth(MHz) × 32.76

with a minimum of 12 subcarriers.

For a 100 MHz channel:

100 × 32.76 ≈ 3,276 subcarriers

The calculator then determines the logarithmic subcarrier offset:

Offset = 10 log₁₀(3,276)

which is approximately 35.15 dB.

Estimated RSRP

Using the previous −61 dBm received power:

RSRP ≈ −61 − 35.15

RSRP ≈ −96.15 dBm

This provides an estimated per-subcarrier reference-signal level under the calculator's simplified assumptions.

Thermal Noise

For a 100 MHz bandwidth:

BW = 100,000,000 Hz

With an 8 dB UE noise figure:

Noise = −174 + 10 log₁₀(100,000,000) + 8

The resulting noise floor is approximately:

−86 dBm

SNR

The calculator then determines:

SNR = −61 − (−86)

SNR ≈ 25 dB

This indicates a strong modeled signal-to-noise relationship under the selected assumptions.

Understanding the Calculator Inputs

The quality of a link-budget estimate depends heavily on the values entered into the calculator.

gNodeB EIRP

EIRP represents the effective isotropic radiated power of the transmitting system. It provides a more useful link-budget quantity than transmitter conducted power alone because antenna effects are incorporated into the effective radiated power.

The calculator provides example values such as 62 dBm for a macro deployment and 40 dBm for a small-cell scenario.

These are input examples rather than universal values for all 5G networks.

Path Loss

Path loss represents the reduction in radio power between the transmitter and receiver.

It can be influenced by:

• Distance
• Operating frequency
• Terrain
• Buildings
• Obstructions
• Foliage
• Urban density
• Propagation environment

The calculator expects the path-loss value to be supplied by the user.

UE Antenna Gain

Receiver antenna gain represents the gain of the UE-side antenna system.

A typical smartphone scenario may be approximated with a low or near-zero gain value, while a fixed outdoor CPE with a directional antenna can have substantially greater effective gain.

Because receiver gain is added directly to the received-power calculation, an 8 dB increase in receiver gain produces an 8 dB increase in modeled received power when all other parameters remain constant.

Penetration & Body Losses

Additional losses can represent building penetration, body loss, cabling, or other miscellaneous attenuation.

The calculator provides example inputs such as:

• 3 dB for an outdoor scenario
• 15 dB for an indoor scenario

These are scenario assumptions, not universal penetration-loss values.

5G Channel Bandwidth

Bandwidth affects the thermal-noise calculation because a wider bandwidth collects more total noise power.

The calculator also uses bandwidth when estimating the number of subcarriers.

For example, changing from 20 MHz to 100 MHz changes both calculations.

UE Noise Figure

Noise figure represents additional receiver noise relative to an ideal receiver.

A lower noise figure generally produces a lower calculated noise floor and therefore a higher SNR for the same received signal power.

How to Use the 5G NR Link Budget & RSRP Calculator

Using the calculator is straightforward.

Step 1: Enter gNodeB EIRP

Enter the effective radiated power of the gNodeB.

Example:

62 dBm

Step 2: Enter Path Loss

Enter the estimated propagation loss between the gNodeB and UE.

Example:

120 dB

Step 3: Enter UE Antenna Gain

Enter the effective receiving antenna gain.

Example:

0 dBi

For a directional FWA CPE, you might use a higher value if supported by the equipment specifications.

Step 4: Enter Penetration and Body Losses

Add estimated additional losses.

Example:

3 dB outdoor

or

15 dB indoor

Step 5: Enter Channel Bandwidth

Enter the 5G NR channel bandwidth.

Example:

100 MHz

Step 6: Enter UE Noise Figure

Enter the receiver noise figure.

Example:

8 dB

Step 7: Review the Results

The calculator returns:

• gNodeB EIRP
• Total path and miscellaneous loss
• Total wideband received power
• Estimated SS-RSRP
• UE thermal noise floor
• Downlink SNR
• Coverage-quality assessment

The most useful workflow is:

Inputs → Received Power → Estimated RSRP → Noise Floor → SNR → Quality Assessment

Real-Life Example: 5G Mid-Band Macro Cell

Consider a network engineer evaluating a smartphone connected to a 5G mid-band macro cell.

The engineer uses the following assumptions:

• gNodeB EIRP: 62 dBm
• Path Loss: 120 dB
• UE Antenna Gain: 0 dBi
• Penetration & Body Losses: 3 dB
• Channel Bandwidth: 100 MHz
• UE Noise Figure: 8 dB

Calculate Received Power

First:

Pᵣ = EIRP − PL − L_misc + Gᵣ

Therefore:

Pᵣ = 62 − 120 − 3 + 0

Pᵣ = −61 dBm

Estimate Subcarriers

The calculator estimates:

N ≈ 100 × 32.76

N ≈ 3,276

Calculate the Subcarrier Offset

10 log₁₀(3,276) ≈ 35.15 dB

Estimate RSRP

RSRP ≈ −61 − 35.15

RSRP ≈ −96.15 dBm

Calculate Noise Floor

For 100 MHz:

BW = 100,000,000 Hz

Using an 8 dB noise figure:

Noise ≈ −86 dBm

Calculate SNR

SNR ≈ −61 − (−86)

SNR ≈ 25 dB

Interpret the Result

The calculator's RSRP threshold places this scenario in the Fair / Good Coverage category, despite the modeled SNR being above 15 dB.

This example demonstrates why looking at only one metric can be misleading. Received power, estimated RSRP, noise floor, and SNR provide different pieces of information.

The result also demonstrates an important limitation: the calculator's quality classification is determined by its predefined thresholds rather than by a complete 5G radio-performance model.

Real-World Use Cases

5G Network Planning

Network planners can use a link-budget calculator during preliminary site analysis.

For example, before performing detailed radio simulations, an engineer can compare different combinations of:

• gNodeB EIRP
• Path loss
• Antenna gain
• Indoor losses
• Bandwidth
• Receiver noise figure

This helps identify potentially challenging coverage scenarios.

Fixed Wireless Access

FWA deployments are a strong practical use case.

A fixed CPE may use a better receiving antenna than a smartphone. By changing the UE antenna gain from 0 dBi to 8 dBi, you can see the direct impact of additional receiver gain on the modeled received power and SNR.

This can help during preliminary CPE-placement or antenna-selection analysis.

Indoor 5G Coverage

Indoor coverage is heavily affected by additional attenuation from walls, windows, building materials, and other obstructions.

The calculator allows the user to model these effects through the penetration and body-loss input.

For example, comparing 3 dB of losses with 15 dB of losses shows the impact of an additional 12 dB attenuation on the modeled link.

5G Troubleshooting

The calculator can also help investigate weak 5G performance.

Suppose a CPE reports weak signal levels. An engineer can model several scenarios:

• Higher path loss
• Lower antenna gain
• Increased building penetration loss
• Higher gNodeB EIRP
• Lower receiver noise figure

This makes it easier to understand which variables could materially affect the theoretical link.

Antenna and CPE Comparison

Antenna gain can be tested directly.

For example:

Phone assumption: 0 dBi

Directional CPE assumption: 8 dBi

With all other inputs unchanged, the 8 dBi CPE provides an 8 dB improvement in modeled received power.

Education and Training

Students and telecom professionals can use the calculator to understand fundamental RF concepts without manually calculating logarithms.

It provides a practical way to observe what happens when EIRP, path loss, bandwidth, receiver gain, or noise figure changes.

RSRP vs Received Power vs SNR

These metrics should not be treated as interchangeable.

Received Power vs RSRP

Received power represents the calculator's total wideband received signal power.

Estimated RSRP is derived from that received power by applying the estimated subcarrier offset.

Therefore, they represent different quantities.

RSRP vs SNR

RSRP primarily describes received signal strength, while SNR describes the relationship between signal power and noise.

A strong signal does not automatically mean that the radio environment is interference-free.

Noise Floor vs RSRP

The noise floor represents the calculated receiver noise based on bandwidth and noise figure.

RSRP represents estimated reference-signal power.

Comparing signal and noise-related quantities helps provide additional context about the modeled radio link.

Understanding the Coverage Quality Ratings

The calculator uses specific thresholds to classify the result.

Excellent

The calculator uses this category when:

• RSRP ≥ −95 dBm
• SNR ≥ 15 dB

This represents the calculator's strongest modeled coverage category.

Fair / Good Coverage

This category applies when the result does not meet the Excellent criteria but remains above the poorer thresholds.

The calculator associates this range with usable coverage and conditions where moderate radio quality may be available.

Poor Coverage

The calculator uses this classification when:

• RSRP is at least −115 dBm
• SNR is at least 0 dB
• The result does not qualify for the higher categories

This indicates weak modeled coverage.

Cell Edge / Unreliable

The calculator assigns this category if:

• RSRP < −115 dBm, or
• SNR < 0 dB

This represents a modeled condition where connectivity may become unreliable.

These thresholds are calculator-specific heuristics. Actual network performance depends on many factors beyond RSRP and the simplified SNR calculation.

What Happens When You Change Each Input?

Understanding sensitivity is one of the most useful aspects of link-budget analysis.

Increasing EIRP

Increasing EIRP increases received power.

If EIRP increases by 5 dB and every other parameter remains unchanged, modeled received power also increases by 5 dB.

Increasing Path Loss

Increasing path loss reduces received power.

For example, adding 10 dB of path loss reduces modeled received power by 10 dB.

Increasing UE Antenna Gain

Receiver gain directly improves the modeled link.

An increase from 0 dBi to 8 dBi adds 8 dB to received power.

Increasing Miscellaneous Losses

Additional losses reduce received power.

Increasing penetration loss from 3 dB to 15 dB introduces an additional 12 dB of attenuation.

Increasing Bandwidth

Increasing bandwidth increases the integrated thermal-noise power.

The calculator also estimates more subcarriers at higher bandwidth, which changes its RSRP estimation.

Increasing Noise Figure

Increasing noise figure raises the calculated noise floor.

The received power and estimated RSRP do not change simply because noise figure changes, but the calculated SNR decreases.

5G NR Link Budget vs Traditional Link Budget

The fundamental link-budget concept is the same across many wireless systems:

Transmitted power + antenna gains − propagation/system losses = received power

5G NR adds additional complexity around the basic calculation.

Real 5G systems can involve:

• Massive MIMO
• Beamforming
• Reference signals
• Resource blocks
• Subcarrier spacing
• Numerology
• TDD operation
• Frequency-dependent propagation
• Multiple antenna layers
• Inter-cell interference

The calculator intentionally simplifies many of these factors so that users can perform a rapid link-budget estimation from a small set of inputs.

Important Assumptions and Limitations

Understanding what the calculator does not model is just as important as understanding what it does.

Simplified Subcarrier Estimate

The calculator estimates:

Subcarriers ≈ bandwidth(MHz) × 32.76

This is an approximation based on the calculator's 30 kHz SCS-oriented model.

Actual 5G NR resource-grid dimensions depend on configuration details such as numerology, subcarrier spacing, channel bandwidth, and usable resource elements.

Simplified RSRP Model

The calculator uses:

RSRP ≈ Pᵣ − 10 log₁₀(N_subcarriers)

This is a simplified estimation method and should not be interpreted as a complete implementation of standardized SS-RSRP measurement behavior.

Simplified SNR Model

The calculator calculates:

SNR = Received Power − Noise Floor

Real cellular networks can be affected by interference from neighboring cells, beam-specific conditions, scheduling, implementation losses, and other radio effects.

Therefore, calculated SNR should be viewed as an estimate rather than a direct prediction of field-measured SINR.

Path Loss Is an Input

The calculator does not calculate path loss from distance or frequency.

The user must provide a suitable path-loss estimate.

For more advanced planning, the path-loss value should come from an appropriate propagation model, measurement campaign, or validated RF planning workflow.

Not a Throughput Calculator

The calculator does not predict actual download or upload throughput.

Throughput depends on considerably more than received signal strength, including modulation and coding, MIMO configuration, scheduling, available resources, interference, traffic load, and radio conditions.

Not a Complete Network Simulator

The calculator does not model:

• Handover
• Mobility
• Beam management
• CQI
• BLER
• MIMO layers
• Inter-cell interference
• Scheduling
• Network traffic
• Actual throughput

Use it for first-pass engineering estimates, not as the sole basis for detailed network deployment decisions.

5G NR Link Budget Best Practices

Use a Defensible Path-Loss Estimate

Path loss is one of the most influential variables in the calculation. Avoid entering an arbitrary number simply to produce a desired result.

Model Multiple Scenarios

Instead of calculating one situation, compare:

• Best case
• Typical outdoor case
• Indoor case
• Cell-edge case
• FWA CPE case

This gives a more useful range of expected conditions.

Include Realistic Additional Losses

Indoor and outdoor deployments can behave very differently. Building penetration and other miscellaneous losses should be represented when appropriate.

Use Actual Antenna Characteristics

If the receiving equipment has a known antenna gain, use that value rather than assuming 0 dBi.

Don't Treat RSRP as Throughput

RSRP can help characterize signal strength, but it cannot by itself determine the actual data rate available to the UE.

Validate With Field Measurements

A link-budget estimate is a model. Real-world testing can reveal propagation and interference conditions that a simplified calculation cannot capture.

Indoor vs Outdoor 5G Example

Consider a 5G macro-cell with:

• EIRP = 62 dBm
• Path loss = 120 dB
• UE antenna gain = 0 dBi
• Bandwidth = 100 MHz
• Noise figure = 8 dB

Now compare two scenarios.

Outdoor Scenario

Miscellaneous losses:

3 dB

Received power:

62 − 120 − 3 + 0 = −61 dBm

Indoor Scenario

Miscellaneous losses:

15 dB

Received power:

62 − 120 − 15 + 0 = −73 dBm

The indoor case introduces 12 dB more loss.

As a result:

• Received power decreases by 12 dB.
• Estimated RSRP decreases by 12 dB.
• Calculated SNR decreases by 12 dB because the noise floor remains unchanged.

This simple comparison demonstrates why a 5G connection that performs well outdoors may experience substantially weaker radio conditions indoors.

Who Should Use This Calculator?

The calculator is particularly useful for:

• RF engineers performing preliminary link-budget calculations
• 5G network planners evaluating coverage scenarios
• Telecom technicians troubleshooting radio conditions
• FWA installers evaluating CPE scenarios
• Antenna engineers comparing receiver antenna gains
• Students learning wireless communication concepts
• Network optimization teams testing different RF assumptions
• Telecom professionals performing quick engineering estimates

Its main advantage is speed. Instead of manually working through logarithmic calculations, users can change parameters and immediately compare the resulting received power, RSRP, noise floor, and SNR.

5G NR Link Budget Calculator Quick Reference

Received Power

Pᵣ = EIRP − PL − L_misc + Gᵣ

Estimated Subcarriers

N ≈ bandwidth(MHz) × 32.76

Estimated RSRP

RSRP ≈ Pᵣ − 10 log₁₀(N)

Thermal Noise

Noise = −174 + 10 log₁₀(BW_Hz) + NF

SNR

SNR = Pᵣ − Noise

Main Variables

• EIRP: gNodeB effective isotropic radiated power
• PL: path loss
• L_misc: penetration and miscellaneous losses
• Gᵣ: UE antenna gain
• BW: channel bandwidth
• NF: UE noise figure
• N: estimated number of subcarriers

Frequently Asked Questions

What is a 5G NR link budget?

A 5G NR link budget estimates the received radio power after accounting for transmitter EIRP, propagation loss, receiver antenna gain, and additional system losses. It can be extended to estimate metrics such as RSRP, noise floor, and SNR.

How do you calculate 5G received power?

The calculator uses:

Pᵣ = EIRP − Path Loss − Miscellaneous Losses + Receiver Gain

All power and loss terms must use compatible logarithmic units.

What is RSRP in 5G?

RSRP, or Reference Signal Received Power, represents the received power associated with reference signals. It is commonly used as an indicator of cellular radio signal strength. This calculator provides a simplified estimate of SS-RSRP based on modeled wideband received power and estimated subcarrier count.

What is the difference between RSRP and SNR?

RSRP describes reference-signal strength, while SNR describes the relationship between signal power and noise power. A UE can have a relatively strong signal but still experience poor radio conditions if interference or noise is significant.

What is a good 5G RSRP?

There is no single RSRP value that guarantees a specific user experience across every 5G deployment. Device, frequency, network configuration, propagation, interference, and application requirements all matter. This calculator uses its own thresholds to classify modeled results.

Does higher 5G bandwidth increase noise?

Yes. For a given receiver noise figure, increasing bandwidth increases the integrated thermal-noise power. The calculator accounts for this using:

Noise = −174 + 10 log₁₀(BW_Hz) + NF

How does antenna gain affect 5G signal strength?

In this link-budget model, receiver antenna gain is added directly to received power. Therefore, increasing receiver gain by 8 dB increases the calculated received power by 8 dB when all other inputs remain unchanged.

Why can 5G RSRP be good while SNR is poor?

Signal strength and signal quality are different concepts. A UE can receive a relatively strong signal while also experiencing interference or noise. This calculator's simplified SNR model considers thermal noise and receiver noise figure, but it does not model the full interference environment of a live cellular network.

Can this calculator calculate 5G throughput?

No. The calculator estimates received power, RSRP, thermal noise, SNR, and a quality classification. Actual throughput requires additional factors such as modulation and coding, MIMO configuration, scheduling, available resources, interference, and network load.

Can this calculator calculate path loss?

No. Path loss is an input to this calculator. Users need to obtain or estimate path loss separately using an appropriate propagation model, measurement, or RF planning tool.

Can this calculator be used for 5G CPE installation?

Yes, it can be useful for preliminary CPE and antenna analysis. For example, you can compare a low-gain smartphone receiver with a directional outdoor CPE. However, actual installation decisions should ideally be validated using field measurements because real propagation and interference can differ from a simplified link-budget model.

Is a higher SNR always better?

For the modeled link, a higher SNR means the calculated signal is stronger relative to the calculated noise floor. However, actual network performance also depends on interference, modulation, coding, MIMO, scheduling, and other system-level factors.

Conclusion

The 5G NR Link Budget & RSRP Calculator provides a practical way to evaluate the core RF factors affecting a modeled 5G NR downlink. By entering gNodeB EIRP, path loss, UE antenna gain, penetration losses, channel bandwidth, and UE noise figure, you can estimate total received power, SS-RSRP, thermal noise floor, and SNR.

The most important concept is that these metrics describe different parts of the radio link. Received power shows the modeled total signal level, RSRP provides an estimated reference-signal level, noise floor represents receiver noise, and SNR compares signal power with that noise.

For preliminary engineering, education, antenna comparisons, FWA analysis, and troubleshooting, the calculator can provide a fast baseline. For production network planning, however, its simplified assumptions should be supplemented with detailed propagation models, standardized measurement methods, interference analysis, and real-world field measurements.