Streaming Internet Speed Planner

Build a household download estimate for the screens you use together. Adjust the stream rates, other activity and reserve, then read what the result can and cannot tell you.

Enter 0–20 streams for each quality. Rates are editable from 0.1–1,000 Mbps. These are estimates, not a speed test. Read the assumptions.

Simultaneous streams and rates
Household activity and connection
Your estimate will appear here

Choose a viewing scenario, then calculate. Inputs stay in this browser and are not saved or submitted.

What Mbps tells you

Mbps means megabits per second: a rate of data transfer, not a picture-quality score. Download capacity is shared by the activities using your home connection. The speed advertised for a broadband package and the rate sustained at a television can differ. This planner estimates a download budget for a viewing situation; it does not measure your line, test your Wi-Fi or recommend a particular broadband package.

Start with the screens that will play at the same time. Choose the intended resolution for each stream, include other download activity and select a reserve. Compare the result with repeated measurements near the viewing devices. For interpreting provider requirements and your own measurements, read our HD and 4K internet-speed guide.

Transparent assumptions and the calculation

The starting rates are 2 Mbps for SD, 3 for HD, 5 for Full HD and 20 for 4K. These are planning inputs, not universal minimums. You can replace each rate with the requirement published by your service. Netflix’s speed guidance lists 3 Mbps for 720p, 5 for 1080p and 15 for 4K. YouTube’s requirements list approximately 1.1 Mbps for 480p, 2.5 for 720p, 5 for 1080p and 20 for 4K. Sources checked September 20, 2026.

Our rounded SD and HD defaults and the 20 Mbps 4K choice provide a simple starting scenario across those examples. They do not cover every codec, frame rate or live service. Check your provider if its requirement is higher. The editable other-usage allowance starts at 10 Mbps, and the reserve starts at 25%; both are illustrative choices made for this planner, not provider recommendations.

Formula: add each stream count multiplied by its rate, add the other-usage allowance, then multiply the total by one plus the headroom percentage divided by 100. Round the result up to a whole Mbps. For example, two 4K streams at 20 Mbps plus 10 Mbps of other use, with 25% headroom, give 62.5 Mbps, rounded to 63. Connection type changes the guidance, not the arithmetic: there is no reliable universal Wi-Fi penalty.

Count simultaneous activity, not owned devices

A household with five screens may use only two at once. Count separate streams rather than every connected device, and avoid counting a phone casting one video to a TV as two independent videos. A paused device can still download updates, so consider background activity separately. Account limits are another constraint: enough bandwidth does not grant permission for more simultaneous streams.

Use the other-usage field for an estimated download allowance for browsing, calls, updates or downloads during viewing. It is not a measurement of those tasks. A large download may consume whatever capacity is available, so pausing or scheduling it can be more useful than assigning a small allowance. Video calls also need upload capacity; this download-only planner does not assess upload speed, latency or reliability.

Why leave bandwidth headroom?

Playback demand and household activity change over time. A reserve avoids planning around a connection running continuously at the calculated subtotal. Try several scenarios rather than treating the default percentage as a guarantee. More reserve increases the planning target, but it cannot repair packet loss, a congested service or unsupported hardware. Zero headroom is available to show the raw subtotal, not as a promise of comfortable playback.

If measurements fall below the estimate, first check whether your assumptions represent normal use. You might reduce concurrent activity or select a lower supported quality. If measurements exceed it and playback still pauses, investigate the local connection and service. Do not buy a faster plan solely because a calculator displays a larger number.

Wi-Fi and Ethernet need different checks

Wi-Fi performance depends on the device, its position and the route to the router. Walls, interference and wireless mesh links can limit the usable connection even when a nearby laptop reports a high speed. Compare playback at the actual screen during a busy household period. Our Wi-Fi placement and settings guide explains how to change one factor at a time.

Ethernet provides a useful comparison when the device and cable route support it. Check the TV’s port or an officially supported adapter before buying equipment. A cable into a mesh node may still depend on a wireless connection upstream. The wired-versus-wireless guide helps interpret that test. A wired connection does not increase the capacity supplied by your internet service.

Why speed tests vary

A test is a sample taken on one device, through one route, at one time. Its server, other household traffic and the test device’s wireless capabilities can affect the result. Repeat comparable tests near your usual viewing time, using the connection the screen actually relies on. A phone on mobile data does not test your home broadband. Record several results rather than selecting only the fastest.

Compare those observations with sustained playback of the same programme and quality. This tool does not measure delay behind a live event or sound synchronization. When video repeatedly stops, follow the buffering diagnostic sequence. When playback is steady but looks soft, use the picture-quality checks to inspect the source, subscription, app and display path.

Common planning questions

Will this tell me which broadband plan to buy?

No. It provides a scenario to compare with measured capacity and provider requirements. Price, availability, upload needs and reliability need separate consideration.

Does a 4K television always use the 4K rate?

No. The programme, account, app and quality setting determine what is delivered. Select the resolution you expect to stream, not simply the resolution printed on the television.

Can I use the planner without JavaScript?

The interactive result needs JavaScript. The formula, example and source assumptions above remain readable, so you can calculate the same estimate manually.

Are my household inputs submitted?

No. The calculator processes inputs in your browser without sending them to a backend or saving them. Use only authorised services and check their account and territory rules separately.