Internet speed calculator

Use this as a planning model, not a line diagnosis

Start with the work that happens together: streams, calls, cloud gaming, cameras and transfers. Enter plausible simultaneous counts and time blocks, then review the editable per-activity rates. A household preset is a starting scenario, not a measurement of your home or an entitlement under a broadband contract.

Compare measured download and upload separately. A speed test describes a path and moment; it does not establish what every room, device or remote service will deliver. The planner does not test Wi-Fi capacity or prove the cause of lag.

Understand the peak and the allowance

The model adds each selected activity’s rate during its assigned time blocks and selects the largest download and upload totals between 07:00 and midnight. Those two peaks can occur at different hours. The chart is an estimate derived from your inputs, not recorded traffic.

Comfortable applies a 1.3 multiplier, then rounds up to convenient values and applies minimum floors. This 30% allowance is a planning choice, not a measured Wi-Fi loss or a cure for poor coverage. Room to grow adds assumed demand for another 4K stream and video call before the allowance.

Activities assigned only overnight do not set the recommended daytime peak. If a backup must finish before a morning deadline—or you work overnight—calculate that workload separately. The tool has fixed time categories and cannot represent every schedule precisely.

Worked example: avoid counting the same activity twice

Using the default rates, two 4K streams contribute 40 Mbps download. Two video calls add 7 Mbps download and 6 Mbps upload. Together that is 47 Mbps down and 6.4 Mbps up, including the streams’ small default upload allowance. Applying 30% gives 61.1 and 8.32 Mbps before rounding; the displayed comfortable recommendation is 70 Mbps down and 9 Mbps up if those are the only activities.

This is model arithmetic, not a tested household. Edit the assumptions for your services. If one person’s “working online” entry already includes the same file transfer you counted as a separate backup, review that overlap instead of unintentionally budgeting it twice.

Check actual service requirements

The defaults are editable estimates. For context, Netflix recommends 15 Mbps or higher for its 4K service, while this model uses 20 Mbps per 4K stream. Different services, codecs and quality settings can need different rates. Zoom’s Web App requirements also differ by call quality; the planner’s call default is not a universal requirement.

Live streaming yourself is an outgoing workload; watching a stream is mainly incoming. Cloud gaming is different from a locally rendered online game. Keep those distinctions when filling in the activity counts.

When a result suggests more investigation

• A low result in one room calls for a Wi-Fi comparison, not an automatic plan upgrade.
• Latency rising under load can be consistent with queuing, but interference, loss and other path issues also deserve checking. Queue-management settings are not a guaranteed cure.
• A low wired test can reflect the device, adapter, negotiated link, VPN, test service or provider path. Repeat and document it before assigning fault.
• The device count is a prompt to consider radio capacity, not a validated threshold at which a router must be replaced.

Read plan comparisons and transfer times carefully

The price section compares your entered rates and monthly charges. The annual difference is the monthly difference multiplied by twelve; it does not include changing prices, installation, exit fees, equipment, reliability or support. An omitted upload value means upload suitability has not been established. Check actual contract terms before deciding to switch.

One-off transfers are shown as waiting times rather than automatically reserved capacity. They can still compete with calls and streams if run together. See the transfer-time guide for arithmetic and the upload guide for deadlines.

Local settings and shared-link privacy

The reviewed calculator stores choices in this browser’s local storage so they can be restored later. It can read a compatible recent result from this site’s speed test in the same browser. Clearing site data, private browsing or a different device can change what is available.

Share link encodes inputs, speeds and entered prices in the URL fragment. It is not encryption: anyone who has the complete link can recover those values, and sharing software may retain the link. Normal browser fragment handling does not send it as part of the HTTP request, but page scripts can access it. Loading the website still makes normal web requests; site-wide analytics and privacy settings are separate. Avoid sharing sensitive household or contract details unnecessarily.