DownloadTime

Does the efficiency factor adapt to connection type, like Wi-Fi versus wired, or is it one fixed percentage? I'm curious how you chose the default value.

Built DownloadTime because "5 minutes left" estimates kept lying to me — this adds a real-world efficiency factor so the answer is honest. Free, EN+ES, no signup.

loved this to check real upload times

Nice and simple. The efficiency factor makes the estimate far more realistic than raw speed math. Reverse mode is a handy touch.

Love that it uses a real-world efficiency factor instead of brochure speeds. That's exactly where most calculators go wrong. Have you thought about a quick note on the Mb vs MB mix-up? It catches so many people out.

The efficiency factor on top of raw file size divided by speed is what makes this feel honest, since real downloads never hit the advertised line rate. The reverse mode (how much fits in X minutes) is a clever touch for planning around slow connections or data caps.

This looks really useful! Especially the reverse calculation feature. Simple idea, but definitely handy in everyday situations. Nice work!

Reverse mode is the part I like most: asking how much fits in X minutes is a real planning need on slow connections. Would a preset list of common connection speeds (hotel wifi, 4G) make that even faster to use?

The reverse mode is the standout for me — working out how much fits in a fixed window is something I actually need before starting a big upload on a capped connection. One thing I'd love: saved presets for common file sizes or speeds, so I don't have to re-enter them each time. The bits-vs-bytes handling is a nice honest touch too.

The reverse mode is the useful part, but the efficiency factor needs to be visible. If I enter a 1 GB file and a 100 Mbps line, a hidden factor like 0.7 changes the answer a lot, and without seeing that number it is hard to tell whether the estimate is conservative or just slower brochure math. A toggle that shows the raw time next to the adjusted one would make the honesty claim easier to trust. Named presets for hotel wifi and congested 4G would also help, since that is where people actually need this instead of retyping speeds.

Reverse mode, where you enter a time window and see how much fits, is a clever angle that most download calculators skip. It would be even handier with one-click presets for common connections like 4G, 5G and typical fiber tiers, so people don't have to look up their speed first.

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Love that the estimate uses a real-world efficiency factor instead of brochure math. A small example under the calculator (e.g. 10 GB on a 100 Mbps line) would help first-time visitors trust the numbers faster.

The bits-vs-bytes handling plus an adjustable efficiency factor is a nice touch, since most calculators ignore protocol overhead. Does the default 90% efficiency come from measured transfers, or is it a rule of thumb you tuned?

Adjusting for real-world efficiency is the right call, advertised speeds never match. What factor do you use by default, and does it differ for Wi-Fi vs wired? A slider for "my line usually gets X% of the plan speed" would make it even more honest.

The bits-vs-bytes handling plus an efficiency factor is the right fix for those fake "5 minutes left" estimates. Reverse mode (how much fits in X minutes) is what I'd actually use before a backup on a capped connection. Is the efficiency factor a fixed percentage, or does it change by connection type such as wifi versus mobile?

The real-world efficiency factor is the part I like, since every OS download estimate I've seen is way off. Can you pick a different factor for Wi-Fi and wired, or is it one fixed number?

Nice and simple. The efficiency factor makes the estimate far more realistic than raw speed math. Reverse mode is a handy touch.

The honest framing is exactly right — advertised speeds never match real downloads, and showing the theoretical floor next to the adjusted estimate makes the difference clear. One idea: add one-click presets for common connections (home fibre, hotel Wi-Fi, 4G/5G) so people don't have to guess their efficiency percentage, and a small note on what the efficiency factor covers (overhead, congestion, server limits). Reverse mode is genuinely handy for planning around data caps.

Nice idea, the efficiency factor makes the estimate much more realistic. Could you show the assumed efficiency percentage (and let people tweak it) for cases like Wi-Fi vs. wired? Might help people trust the number even more.

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The connection-type awareness question is important. A fixed efficiency percentage makes the estimate conservative on fast wired links and optimistic on congested Wi-Fi, so a small calibration step after the first measured download would make the predictions much more trustworthy over time.

Handy for sanity-checking a large backup upload or a big model download before committing to it. I like that the estimate uses a real-world efficiency factor rather than the theoretical line speed. A preset for Wi-Fi or VPN overhead would make it even more practical.