Latency Calculator

Estimate network latency, propagation delay, transmission delay, round-trip time (RTT), and gaming ping. Free online latency calculator for networking, gaming, cloud, and DevOps.

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Latency Calculator

Estimate propagation delay, transmission delay, RTT, and gaming ping based on distance, medium, and bandwidth. All calculations run locally in your browser.

Network Parameters

Distance

Transmission Medium

Bandwidth

Packet Size

Standard Ethernet MTU = 1500 bytes

Routing Overhead: 20%

0% (ideal)50%100%

Simulates router hops, congestion, and protocol overhead.

Press Esc to reset

Basic Latency Estimate

Enter parameters above to calculate

Region Presets

Cloud Provider Presets

Bandwidth Presets

Calculation Results

Enter parameters to see results

How the Latency Calculator Works

This tool calculates estimated network latency based on the physical distance between two points, the transmission medium, available bandwidth, and packet size. The three main components of end-to-end delay are propagation delay, transmission delay, and routing overhead.

All calculations run locally in your browser using standard networking formulas. No data is sent to any server.

The Formulas

Propagation Delay (ms) = (Distance in km ÷ Signal Speed in km/s) × 1000

Transmission Delay (ms) = (Packet Size in bits ÷ Bandwidth in bps) × 1000

Round Trip Time (RTT)   = One-Way Total Latency × 2

Total Latency           = Propagation + Transmission + Routing Overhead

Example: 5,000 km at 100 Mbps, fiber, 1500 byte packet, 20% overhead
  Propagation:    5000 ÷ 200,000 × 1000  = 25 ms
  Transmission:   12000 ÷ 100,000,000 × 1000 = 0.12 ms
  Routing (20%):  25 × 0.20              = 5 ms
  Total:          25 + 0.12 + 5          = 30.12 ms
  RTT:            30.12 × 2              = 60.24 ms

Signal Speeds by Medium

Medium	Speed	Notes
Fiber Optic	~200,000 km/s	~2/3 speed of light in glass fiber
Copper Cable	~180,000 km/s	Slightly slower due to electrical resistance
Satellite	~120,000 km/s (eff.)	Geostationary orbit adds 35,786 km each way
Wireless / WiFi	~160,000 km/s	Variable — affected by interference and walls
Cellular (4G/5G)	~140,000 km/s	Includes tower aggregation overhead

Latency Performance Reference

Latency	Rating	Use Case
< 20 ms	Excellent	High-frequency trading, real-time control systems
20–50 ms	Good	Competitive gaming, video calls, live streaming
50–100 ms	Moderate	Casual gaming, VoIP, web browsing
100–200 ms	Poor	Basic web browsing, email — noticeable delay in calls
> 200 ms	Very High	Satellite links, degraded user experience

Frequently Asked Questions

What is propagation delay?

Propagation delay is the time it takes for a signal to travel from the sender to the receiver across a physical medium. It depends purely on distance and the signal speed of the medium — not on bandwidth.

What is transmission delay?

Transmission delay is the time required to push all bits of a packet onto the wire. It depends on packet size and bandwidth: a larger packet or a slower link increases this delay.

What is RTT (round-trip time)?

RTT is the total time for a signal to travel from source to destination and back. It is approximately twice the one-way latency and is what tools like 'ping' measure.

Why is satellite latency so high?

Geostationary satellites orbit at ~35,786 km above Earth. A signal must travel up to the satellite and back down, adding roughly 240 ms of propagation delay each way — before any processing or routing time.

What causes gaming lag?

Gaming lag is caused by a combination of propagation delay (distance to server), transmission delay (packet size vs bandwidth), routing overhead (number of network hops), and server processing time. This calculator estimates the network component.

How does routing overhead affect latency?

Real-world packets don't travel in straight lines. They pass through multiple routers, cross different ISP networks, and can experience congestion. The routing overhead slider simulates this additional delay as a percentage of propagation delay.