What is the difference between Mbps and MBps?

Mbps stands for megabits per second; MBps stands for megabytes per second. There are 8 bits in a byte, so 1 MBps = 8 Mbps. ISPs advertise in Mbps; file sizes are measured in bytes (MB, GB).

Why is my actual download speed lower than my ISP plan?

ISP speeds are theoretical maximums. Overhead from TCP/IP headers, network congestion, Wi-Fi interference, and server limits typically reduce real-world speeds by 10–20%.

Does this tool use binary (1024) or decimal (1000) prefixes?

Network speeds use decimal prefixes: 1 Mbps = 1,000,000 bits/s and 1 GB = 1,000,000,000 bytes. This matches how ISPs and hard drive manufacturers measure speeds and capacities.

How is transfer time calculated?

Transfer time (seconds) = file size in bits / speed in bits per second. The result is then formatted into hours, minutes, and seconds for readability.

Can I calculate upload time as well as download time?

Yes. Simply enter your upload speed (usually listed separately by your ISP) in place of the download speed, then enter the file size to get the estimated upload duration.

Network Speed Calculator

Name: Network Speed Calculator
Availability: InStock
Author: Nham Vu

Convert between Mbps, MBps, Gbps, GBps, Kbps, and KBps, and estimate file transfer time for any file size.

Network Speed

Speed Value

File Transfer Time (optional)

File Size

Speed Conversions

Enter a speed value to see conversions.

Estimated Transfer Time

Enter a file size and click Calculate.

Copied!

Summary

Convert between Mbps, MBps, Gbps, GBps, Kbps, and KBps, and estimate file transfer time for any file size.

How it works

Enter a network speed value and select its unit (e.g. 100 Mbps).
Optionally enter a file size and its unit (e.g. 2 GB) to estimate transfer time.
The calculator converts the speed into all other units simultaneously.
Transfer time is displayed in a human-readable format (hours, minutes, seconds).
All calculations run entirely in your browser — no data is sent anywhere.

Use cases

Convert your ISP plan speed from Mbps to MBps to understand real download rates.
Estimate how long a large backup or video upload will take on your connection.
Check if a server's network interface will bottleneck your data pipeline.
Compare cloud egress costs by converting Gbps to GBps for billing calculations.
Verify storage device read/write speeds against your network throughput.
Plan data migration windows by calculating transfer time for terabyte datasets.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu