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Bandwidth Calculator

How much bandwidth your traffic actually needs, including the peak.

  • Free
  • No signup
  • Nothing uploaded
  • No watermark

Monthly transfer

200 GB

Average bandwidth

0.62 Mbps

Provision for

1.85 Mbps

the peak

Peak is estimated at 3× the average, because traffic is never evenly spread across a month — provisioning for the average means being down at the busy hour.

How to Use the Bandwidth Calculator Online

Bandwidth Calculator: before and after TEXT A YOUR INPUT BANDWIDTHCALCULATOR DONE A RESULT

Works out the bandwidth traffic actually needs, including the peak rather than the average. Sizing on the average is the standard mistake: traffic arrives in bursts, and a link provisioned for the mean is saturated whenever anything interesting happens.

No software to install Free Works on any device

Step-by-Step Guide to Using the Bandwidth Calculator

  1. 1. Fill in the fields with your own values

  2. 2. The answer updates as you type — there is no button to press

  3. 3. The reasoning is explained underneath, not just the number

Try it now

What is the Bandwidth Calculator?

Works out the bandwidth traffic actually needs, including the peak rather than the average. Sizing on the average is the standard mistake: traffic arrives in bursts, and a link provisioned for the mean is saturated whenever anything interesting happens.

Why Use IP and Network Calculators?

Subnet masks, CIDR ranges and download times all come down to binary maths that is easy to slip on. These calculators do the sums in the page, so you can plan an address range or check a speed claim with confidence.

“One wrong subnet mask can take a whole office offline.”
  • Subnets worked out instantly
  • CIDR ranges made clear
  • Download times estimated
  • Browser details revealed
  • Usable host counts shown
  • IPv4 and IPv6 conversions
  • MAC addresses checked
  • No commands to install

Popular Uses for Subnet Calculators

Network jobs at home and at work often start with one of these sums.

  • Planning an office network Split an address block into subnets for each floor, team or guest WiFi.
  • Reading CIDR notation See the first address, last address and host count behind a range like /24.
  • Download estimates Work out how long a large file will take on a given connection speed.
  • Speed claims Turn megabits per second into megabytes to see what a plan really delivers.
  • Device lookups Find the maker of a network card from its MAC address prefix.
  • Browser checks See your user agent and browser details when a support team asks.
  • WebSocket tests Connect to a WebSocket endpoint and watch messages go back and forth.
  • IPv6 planning Convert an IPv4 address into IPv6 form while preparing a migration.

What You Can Do with the Bandwidth Calculator

The calculation happens on your own machine, at your machine's speed

Shows the network, broadcast and usable host range together, which is the whole answer

Handles IPv6 at full length rather than truncating it for display

Why Use ToolXkit for Bandwidth Calculator?

Your files stay with you

Everything runs inside your browser. Nothing you open or type is uploaded to a server.

Network Tools for Different Users

Network administrators

Plan subnets, check CIDR ranges and size links for expected bandwidth.

Networking students

Practise subnetting for CCNA and other exams, and check answers quickly.

Developers

Test WebSocket servers, parse user agents and inspect TCP header fields.

IT support staff

Collect browser details and estimate transfer times while helping users.

Small office owners

Understand router settings and IP ranges without calling a technician every time.

Streamers and gamers

Check upload speed, latency and packet loss figures before a stream.

Best Times to Work Out a Subnet

Network calculators help when you are:

  • Setting up a new router
  • Studying for a networking exam
  • Adding a guest WiFi network
  • Estimating a large upload
  • Comparing broadband plans
  • Identifying an unknown device
  • Moving to IPv6
  • Debugging a WebSocket connection

Frequently Asked Questions

Answers to common questions about this tool.

Should I size for average or peak traffic?

Peak, always. Traffic arrives in bursts, so a link provisioned for the mean is saturated whenever anything interesting happens — which is precisely when it matters. A common rule of thumb is to size for the 95th percentile rather than the average.

What is 95th percentile billing?

A common way transit is charged: usage is sampled every five minutes over a month, the top 5% of samples are discarded, and you pay for the highest remaining figure. It means brief spikes are effectively free and sustained load is not.

Is Bandwidth Calculator accurate enough for real network work?

The maths behind addresses and ranges is exact, so the results match what a router expects. Double-check the input, especially the prefix length, since one wrong digit changes the whole range.

Do the calculators scan my network?

No. The subnet and speed calculators only work with the numbers you type in. They send no traffic into your network, and the only tool that connects anywhere is the WebSocket Tester, to the address you enter.

Why is my real download slower than the estimate?

The calculator assumes the full connection speed is available. In practice, WiFi, other devices, server limits and protocol overhead eat into it, so real downloads often take somewhat longer.

Is Bandwidth Calculator free and private?

Yes. It costs nothing and needs no account. What you type stays in your browser and is never sent to ToolXkit, which matters when it describes a real company network.

What is the difference between Mbps and MBps?

Mbps means megabits per second, the unit broadband plans use. MBps means megabytes per second, the unit most download windows show. One byte is eight bits, so 100 Mbps is about 12.5 MBps.

Further reading

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