5G NR QoS (5QI) Flow Calculator

The 5G NR QoS (5QI) Flow Calculator helps network engineers, students, telecom professionals, and 5G researchers evaluate the QoS characteristics associated with a selected 5G QoS Identifier (5QI). By entering a 5QI value, optional Guaranteed Bit Rate (GBR), and measured one-way latency, you can quickly view the corresponding resource type, priority level, Packet Delay Budget (PDB), Packet Error Rate (PER), and typical application context.

5QI is an important part of 5G QoS because different applications have very different network requirements. A voice call, online game, industrial robot, and ordinary web session should not necessarily receive identical treatment from the network.

This calculator provides a convenient way to connect a 5QI value with its associated QoS characteristics and perform a basic latency comparison against the profile's PDB.

Quick answer: A 5QI calculator maps a 5QI value to QoS characteristics such as resource type, priority, Packet Delay Budget, Packet Error Rate, and application context. This calculator also compares your measured one-way latency with the selected profile's PDB.

What Is 5QI in 5G?

5QI, or 5G QoS Identifier, is an identifier used to characterize QoS requirements associated with a 5G QoS Flow.

A 5G network carries many different types of traffic simultaneously. For example, a smartphone might be:

• Making a VoNR voice call
• Watching a video
• Browsing a website
• Playing an online game
• Using an enterprise application

These applications don't have identical performance requirements. Interactive applications generally benefit from low latency, while some background or buffered applications can tolerate considerably more delay.

A 5QI value provides a standardized way to associate a QoS Flow with defined QoS characteristics. These characteristics can include:

• Priority Level
• Packet Delay Budget (PDB)
• Packet Error Rate (PER)
• Resource Type
• Other QoS-related characteristics depending on the applicable 3GPP specification and release

The 5QI itself should not be confused with bandwidth or internet speed. A 5QI value is not simply a rating such as "fast" or "slow." Instead, it identifies a particular QoS treatment/profile.

For example, this calculator associates 5QI 1 with conversational voice, 5QI 3 with real-time gaming, and selected higher 5QI values such as 82–85 with delay-critical applications.

What Does the 5G NR QoS Calculator Calculate?

The calculator takes three inputs:

1. Standardized 5QI Index
2. Guaranteed Bit Rate (GBR), optional
3. Measured Network One-Way Latency

It then looks up the selected 5QI profile and returns several useful parameters.

The calculator is therefore useful both as a 5QI reference tool and as a basic QoS performance evaluation tool.

How to Use the 5G NR QoS (5QI) Flow Calculator

Using the calculator is straightforward.

Step 1: Enter the 5QI Index

Enter an integer between 1 and 255.

For example:

The calculator searches its built-in 5QI database for the corresponding QoS profile.

Step 2: Enter a GBR Value if Applicable

If the selected flow is associated with a GBR requirement, enter the desired value in Mbps.

For example:

If you don't have a specific GBR value, you can leave the field at 0.

For a GBR profile, the calculator then indicates that the flow requires GBR/MFBR configuration when a specific GBR value isn't provided.

Step 3: Enter Measured One-Way Latency

Enter the measured network latency in milliseconds.

For example:

The calculator compares this value against the PDB associated with the selected profile.

Step 4: Review the Results

The calculator returns the selected 5QI, service profile, resource type, priority, PDB, PER, latency comparison, GBR status, and typical application context.

Understanding Packet Delay Budget (PDB)

Packet Delay Budget (PDB) is one of the key QoS characteristics associated with a 5QI profile.

The calculator uses PDB as the reference point for its latency comparison.

The basic logic is:

and:

For example, suppose the selected profile has:

Because:

the calculator reports the measured latency as compliant with the selected PDB comparison.

If the measured latency were 120 ms:

the calculator would report it as non-compliant.

PDB Is Not the Same as Ping

This distinction is important.

The calculator expects measured one-way network latency, while a conventional ping test commonly reports round-trip behavior. Therefore, you should not automatically enter a ping result into the calculator as though it were a one-way PDB measurement.

Also, passing this calculator's PDB comparison does not prove that an entire 5G network satisfies every QoS requirement. Real network performance depends on the RAN, transport network, 5G Core, scheduling, congestion, measurement methodology, and other factors.

Understanding Packet Error Rate (PER)

Packet Error Rate (PER) represents an error-rate characteristic associated with a QoS profile.

The calculator displays PER using scientific notation, such as:

A smaller numerical PER generally represents a more stringent error requirement.

For example:

represents a more stringent error-rate characteristic than:

However, PER should not automatically be interpreted as an application's observed packet-loss percentage. In a real 5G deployment, measurements must be made according to the applicable QoS definition and measurement point.

Understanding 5QI Priority Level

Priority Level represents relative priority associated with QoS treatment.

In this calculator, the convention is:

1 = Highest priority

For example, the built-in profiles include:

• 5QI 65 → Priority 7
• 5QI 5 → Priority 10
• 5QI 1 → Priority 20
• 5QI 3 → Priority 30
• 5QI 6 → Priority 60

Therefore, a lower numerical value represents a higher priority level within the calculator's displayed convention.

Priority should not be confused with:

• Internet speed
• Maximum throughput
• Signal strength
• Guaranteed bandwidth
• Latency by itself

It is one component of QoS treatment rather than a direct performance score.

Understanding 5QI Resource Types

The calculator supports three resource-type categories:

GBR

GBR means Guaranteed Bit Rate.

A GBR flow is associated with a guaranteed bit-rate requirement and appropriate QoS configuration.

The calculator includes several GBR profiles, including:

• 5QI 1
• 5QI 2
• 5QI 3
• 5QI 4
• 5QI 65

If you enter a positive GBR value, the calculator displays the configured value as a dedicated GBR allocation.

Non-GBR

Non-GBR flows do not use the same guaranteed bit-rate model as GBR flows.

The calculator includes:

• 5QI 5
• 5QI 6
• 5QI 7

Examples include IMS signaling, general TCP traffic, web browsing, email, and buffered video.

Delay-Critical GBR

Delay-Critical GBR is represented in the calculator for highly delay-sensitive use cases.

The included examples are:

• 5QI 82 — Discrete Automation
• 5QI 83 — Process Automation
• 5QI 84 — V2X / Autonomous Driving
• 5QI 85 — Remote Control / AR-VR

These profiles have particularly stringent PDB values in the calculator's database.

5QI Profiles Included in This Calculator

The calculator contains a predefined database of selected 5QI profiles.

Standards note: The database in this calculator is identified in the code as being based on 3GPP TS 23.501 Table 5.7.4-1. Because 3GPP specifications are maintained across releases, published content should identify and verify the applicable specification release before presenting these values as the current standard.

Real-Life Example: 5QI 1 for a 5G VoNR Call

Consider a mobile operator testing QoS for Voice over New Radio (VoNR).

The engineer enters:

The calculator identifies the profile as:

• Service: Conversational Voice
• Resource Type: GBR
• Priority: 20
• PDB: 100 ms
• PER: 10⁻²
• GBR: 5 Mbps Dedicated GBR Allocation

The latency comparison is:

Therefore, the calculator reports:

Compliant

What Does This Mean in Practice?

The result indicates that the supplied measured one-way latency is below the PDB stored for the selected calculator profile.

For a network engineer, this provides a quick first-level check.

However, a real VoNR deployment involves much more than one latency measurement. An engineer may also need to examine:

• 5G RAN performance
• QoS Flow configuration
• 5G Core policy
• Transport network latency
• Scheduling behavior
• Congestion
• Packet handling
• Measurement methodology
• End-to-end service performance

So the calculator result should be treated as a PDB comparison, not as a complete VoNR QoS certification.

Use Case: 5QI 3 for Real-Time Gaming

Imagine a 5G operator evaluating QoS for an interactive gaming service.

The engineer enters:

The calculator identifies:

• Service: Real-Time Gaming
• Resource Type: GBR
• Priority: 30
• PDB: 50 ms
• PER: 10⁻³

The latency comparison becomes:

The calculator therefore reports the measurement as compliant.

This type of analysis can be useful when comparing network measurements with the QoS characteristics associated with a selected service profile.

If the measured latency were instead:

the comparison would become:

and the calculator would report the result as non-compliant.

This doesn't automatically identify the cause of the delay. Further troubleshooting could involve the radio link, backhaul, core network, server location, congestion, or the measurement methodology.

Use Case: Industrial Automation with 5QI 82

A private 5G network in a manufacturing environment may support robotic equipment and automated production systems.

Suppose an engineer evaluates the calculator's 5QI 82 profile.

Input:

The calculator's profile contains:

• Service: Discrete Automation
• Resource Type: Delay-Critical GBR
• Priority: 19
• PDB: 10 ms
• PER: 10⁻⁴

The latency test is:

Therefore, the calculator reports:

Compliant

This example demonstrates why QoS characteristics become increasingly important as applications become more delay-sensitive.

For industrial applications, however, engineers should perform appropriate end-to-end validation before deploying a system for demanding or safety-related functions. A single PDB comparison cannot establish overall system suitability.

Use Case: Remote Control and AR/VR with 5QI 85

The calculator associates 5QI 85 with Remote Control / AR-VR scenarios.

Its stored profile is:

• Resource Type: Delay-Critical GBR
• Priority: 21
• PDB: 5 ms
• PER: 10⁻⁵

Suppose measured latency is:

The comparison is:

The calculator reports compliance.

If latency increases to:

then:

and the calculator reports non-compliance.

This example highlights how even a few milliseconds can matter when working with highly delay-sensitive QoS profiles.

GBR vs Non-GBR vs Delay-Critical GBR

Understanding the resource type is essential when interpreting a 5QI result.

The distinction is important because two flows with similar latency characteristics can still have very different resource requirements.

How the Calculator Evaluates Latency

The calculator uses a straightforward comparison.

Conceptually:

The decision logic is:

For example:

Example A

Result:

Example B

Result:

The calculation is intentionally simple so users can quickly understand whether the entered measurement is below or above the profile's PDB.

What Happens When You Enter an Unlisted 5QI?

The calculator contains selected 5QI profiles rather than every possible value.

If a supplied 5QI isn't present in the database, the calculator uses a fallback profile.

Its fallback values include:

• Service: Operator-Specific / Non-Standard 5QI Range
• Priority: 80
• PDB: 100 ms
• PER: 10⁻⁶
• Application: Custom Operator Specific Data Flow

For 5QI values of 128 or higher, the calculator labels the resource type as:

Operator Specific

For other unlisted values, it uses:

Dynamic / Pre-configured

Important Warning

These fallback values are calculator defaults. They should not be interpreted as saying that every unlisted 5QI has a standardized PDB of 100 ms, PER of 10⁻⁶, or priority of 80.

For operator-specific or dynamically configured QoS, the actual configuration and applicable standards documentation should be consulted.

5QI Calculator vs Ping Test

A 5QI calculator and a ping test answer different questions.

A ping test can be useful during network troubleshooting, but it should not automatically be treated as a direct measurement of the PDB used by a 5QI profile.

For the most meaningful analysis, use a measurement methodology appropriate to the QoS characteristic being evaluated.

Common 5QI Mistakes

1. Thinking 5QI Represents Internet Speed

5QI is not an Mbps rating. It represents QoS characteristics.

2. Treating PDB as Ping

PDB and ping RTT are not interchangeable measurements.

3. Assuming a Lower PDB Means "Better"

A lower PDB represents a more stringent delay characteristic. Whether it is appropriate depends on the application.

4. Ignoring Resource Type

GBR, Non-GBR, and Delay-Critical GBR represent different QoS resource models.

5. Assuming PDB Compliance Means Complete QoS Compliance

The calculator performs a specific latency comparison. It doesn't validate the entire 5G network.

6. Treating PER as Generic Packet Loss

The PER characteristic has a specific QoS context and shouldn't automatically be compared with an arbitrary packet-loss statistic.

7. Treating Fallback Values as Standardized Values

Unlisted 5QI values require appropriate operator and standards context.

Practical Applications of a 5G 5QI Calculator

A 5QI calculator can be useful across multiple telecom and networking workflows.

Mobile Network Engineering

Engineers can use it to quickly review QoS characteristics associated with traffic such as:

• VoNR
• Interactive services
• Gaming
• Video
• General data

Private 5G Networks

Private network teams can use QoS profiles when discussing:

• Industrial automation
• Robotics
• Machine communications
• Enterprise applications

Automotive Networks

Selected profiles can be examined in contexts such as:

• V2X communications
• Connected vehicles
• Low-latency automotive applications

Mission-Critical Communications

The calculator includes a 5QI 65 profile associated with mission-critical push-to-talk in its database.

Education and Training

Students and junior network engineers can use the calculator to understand the relationship between:

5QI → Resource Type → Priority → PDB → PER → Application

This makes an otherwise abstract QoS specification easier to explore.

How Network Engineers Can Use the Results

A practical workflow can look like this:

1. Identify the application or traffic class.
2. Determine the relevant 5QI.
3. Review its resource type.
4. Check the PDB.
5. Review the PER characteristic.
6. Review priority.
7. Determine whether GBR parameters are applicable.
8. Measure network performance using an appropriate methodology.
9. Compare measured latency with the expected QoS characteristic.
10. Investigate any performance gap using network telemetry and detailed testing.

The calculator works best as a quick reference and first-level analysis tool.

For production network design, engineers should validate the configuration against the applicable 3GPP specifications, operator policies, QoS Flow configuration, and actual network measurements.

5G QoS Calculator Worked Examples

These examples demonstrate the calculator's core logic without implying that the result represents complete end-to-end network compliance.

Formula and Calculation Logic

The calculator primarily performs a 5QI profile lookup rather than deriving the QoS characteristics mathematically from the 5QI number.

The relationship is:

The profile provides:

The latency evaluation is:

Otherwise:

For GBR profiles, the calculator checks the optional GBR input.

If:

the result shows the supplied GBR as a dedicated GBR allocation.

If:

the calculator indicates that the GBR flow requires GBR/MFBR parameter configuration.

For Non-GBR profiles, the calculator reports:

Non-GBR Flow (Shared / Best-Effort Bandwidth)

These are the calculator's implementation rules and should not be interpreted as a complete simulation of 5G QoS resource allocation.

Limitations of the 5G NR QoS Calculator

The calculator is designed for quick evaluation and education, so it has several important limitations.

It:

• Uses a predefined subset of 5QI profiles.
• Uses fallback values for unlisted 5QI values.
• Compares one user-provided latency measurement with the stored PDB.
• Does not simulate 5G radio scheduling.
• Does not calculate actual application throughput.
• Does not perform packet-level PER testing.
• Does not configure a 5G Core network.
• Does not establish or validate an actual QoS Flow.
• Does not perform a full network conformance test.
• Does not replace the applicable 3GPP specifications.

The calculator should therefore be considered a QoS reference and basic evaluation tool, rather than a complete 5G network testing platform.

Frequently Asked Questions

What is a 5QI calculator?

A 5QI calculator maps a 5G QoS Identifier to associated QoS characteristics such as Packet Delay Budget, Packet Error Rate, priority level, resource type, and typical service context. This calculator also compares a measured one-way latency with the selected profile's PDB.

What is 5QI in 5G?

5QI stands for 5G QoS Identifier. It identifies QoS characteristics associated with a 5G QoS Flow and helps distinguish the performance requirements of different traffic types.

What is 5QI 1 used for?

In this calculator, 5QI 1 is associated with Conversational Voice. Its stored profile is GBR with priority 20, a 100 ms PDB, and a 10⁻² PER characteristic.

What is 5QI 3 used for?

The calculator associates 5QI 3 with Real-Time Gaming. Its stored profile has GBR resource type, priority 30, a 50 ms PDB, and a 10⁻³ PER characteristic.

What is 5QI 6?

The calculator associates 5QI 6 with Buffered Video / TCP Traffic. It is represented as Non-GBR with priority 60 and a 300 ms PDB.

What is 5QI 85?

The calculator associates 5QI 85 with Remote Control / AR-VR. It is represented as Delay-Critical GBR with priority 21, a 5 ms PDB, and a 10⁻⁵ PER characteristic.

What is PDB in 5G?

PDB stands for Packet Delay Budget. It is a QoS characteristic associated with a 5QI profile and represents a defined delay requirement within the applicable 3GPP QoS framework.

What does PER mean in 5G QoS?

PER means Packet Error Rate. It is an error-rate characteristic associated with a QoS profile. The calculator displays PER values such as 10⁻², 10⁻³, 10⁻⁴, 10⁻⁵, and 10⁻⁶.

Is a lower 5QI priority number better?

Under the priority convention displayed by this calculator, 1 represents the highest priority. Therefore, a lower numerical priority value represents higher priority.

What is the difference between GBR and Non-GBR?

GBR represents a QoS resource type associated with a guaranteed bit-rate requirement, while Non-GBR does not use the same guaranteed bit-rate model. The appropriate resource type depends on the service and network QoS configuration.

Does 5QI determine internet speed?

No. A 5QI value is not an internet-speed measurement. It identifies QoS characteristics such as priority, delay budget, error-rate characteristics, and resource type.

Does passing the calculator's PDB comparison mean my network is fully compliant?

No. The calculator only compares the supplied measured one-way latency with the PDB stored for the selected profile. Full QoS validation requires appropriate network measurements, configuration analysis, and consideration of the applicable 3GPP requirements.

Conclusion

The 5G NR QoS (5QI) Flow Calculator provides a practical way to understand how different 5QI values relate to 5G QoS characteristics. It brings together important parameters such as PDB, PER, priority level, resource type, GBR status, and application context in a single interface.

It can be particularly useful for reviewing profiles associated with voice, gaming, video, mission-critical communication, industrial automation, V2X, and remote-control applications.

The calculator also provides a simple latency check by comparing measured one-way latency against the selected profile's PDB. For example, a 15 ms measurement against a 100 ms PDB passes the calculator's comparison, while an 8 ms measurement against a 5 ms PDB does not.

The key takeaway is that 5QI is about QoS characteristics, not simply network speed. Use the calculator as a quick reference and first-level analysis tool, then validate important production decisions against the applicable 3GPP release, operator configuration, and real-world network measurements.