Bandwidth and download time calculator

Download or upload time for a file at a given speed, the data a link moves in a set time, and a website's monthly bandwidth from page views.

آخر تحديث 28 سبتمبر 2026أمثلة تم التحقق منها: 6

Transfer time

1 h 10 min 10 s

Transfer time in seconds: 4,210.53s
Data: 50GB / 46.566GiB
Payload speed after overhead: 95Mbit/s

Moving 50 GB at 100 Mbit/s with 5% overhead takes 1 h 10 min 10 s; speeds are in bits and sizes in bytes, so the size is multiplied by 8 first.

Same transfer at other speeds

طريقة الحساب S

Size in bits
$5 \times 10^{10}\ \text{B} \times 8 = 4 \times 10^{11}\ \text{bit}$
Payload speed
$100\ \text{Mbit/s} \times (1 - 5\%) = 95\ \text{Mbit/s}$
Headers, acknowledgements and retransmissions share the line with your data.
Divide size by speed
$t = \frac{4 \times 10^{11}}{9.5 \times 10^{7}} = 4{,}210.53\ \text{s}$

حول Bandwidth and download time calculator

Transfer time is the size in bits divided by the speed in bits per second: t = 8 × bytes ÷ (rate × (1 − overhead)). The factor of 8 is there because internet plans quote megabits per second while files are measured in bytes. The other two modes run the same equation the other way, for the data a link moves in a set time, or multiply page views by page weight for a website's monthly traffic.

The default, a 50 GB download on a 100 Mbit/s plan with 5% protocol overhead, takes 1 h 10 min 10 s; with no overhead it would take 1 h 6 min 40 s. A site with 100,000 monthly views of a 2 MB page serves 200 GB a month.

Real downloads can be slower than the result when the server, Wi-Fi or a congested route caps the speed below the plan's rate. Sizes follow IEC 80000-13: 1 GB is 10^9 bytes and 1 GiB is 2^30 bytes.

أمثلة محلولة

50 GB at 100 Mbit/s with no overhead

أريد حساب: Transfer time
Data size: 50 GB
Connection speed: 100 Mbit/s
Protocol overhead: 0%

Transfer time in seconds: 4,000 s
Transfer time: 1 h 6 min 40 s

مصدر التحقق: ⁨Python 3.8: 50e9 × 8 / 100e6 = 4000 s⁩

Same transfer with 5% overhead

أريد حساب: Transfer time
Data size: 50 GB
Connection speed: 100 Mbit/s
Protocol overhead: 5%

Transfer time in seconds: 4,210.53 s
Payload speed after overhead: 95 Mbit/s

مصدر التحقق: ⁨Python 3.8 decimal: 4000 / 0.95 = 4210.526315…⁩

1 GiB at 1 Gbit/s (binary size, edge)

أريد حساب: Transfer time
Data size: 1 GiB
Connection speed: 1 Gbit/s
Protocol overhead: 0%

Transfer time in seconds: 8.59 s

مصدر التحقق: ⁨Python 3.8: 2**30 × 8 / 1e9 = 8.589934592 s⁩

One hour at 100 Mbit/s

أريد حساب: Data moved in a time
Connection speed: 100 Mbit/s
Time spent transferring: 1 h
Protocol overhead: 0%

Data: 45 GB
Data: 41.91 GiB

مصدر التحقق: ⁨Python 3.8: 100e6 × 3600 / 8 = 45e9 B; 45e9 / 2**30 = 41.90951 GiB⁩

الأسئلة

How long does it take to download 1 GB at 100 Mbps?

About 80 seconds at the full line rate: 1 GB is 8,000 megabits, and 8,000 ÷ 100 = 80 s. With 5% protocol overhead it takes about 84 s. At 10 Mbit/s the same file takes 13 min 20 s, and at 1 Gbit/s about 8 s, as long as the server and Wi-Fi keep up.

What is the difference between Mbps and MB/s?

Mbps (megabits per second) measures network speed, while MB/s (megabytes per second) is how browsers and download managers show progress. One byte is 8 bits, so divide Mbps by 8: a 100 Mbit/s plan tops out at 12.5 MB/s, and 1 Gbit/s at 125 MB/s. Protocol overhead lowers the figure you see by a further few percent.

Why is my download slower than my internet speed?

Part of the gap is protocol overhead: over Ethernet, TCP/IPv4 carries 1,460 bytes of data in each full 1,538-byte frame on the wire, so about 5% of the line rate goes to headers, preamble and inter-frame gap. The rest comes from the server's own limit, Wi-Fi signal, congestion on the route, or other devices sharing the connection.

How much bandwidth does a website need per month?

Multiply monthly page views by the average page weight, which your browser's network panel shows. 100,000 views of a 2 MB page is 200 GB a month, about 6.7 GB a day or an average of 0.62 Mbit/s. Visits bunch up in busy hours, so size hosting and caching for several times that average.

Is 1 GB 1,000 MB or 1,024 MB?

Under the SI and IEC 80000-13 prefixes, 1 GB is 1,000 MB, or 10^9 bytes, while 1 GiB (gibibyte) is 1,024 MiB, or 2^30 = 1,073,741,824 bytes. Network speeds and drive labels use decimal units. Windows counts in binary units but labels them GB, so a 50 GB file shows there as 46.57.

ما مدى دقة «⁨Bandwidth and download time calculator⁩»؟

تعتمد الدقة على مدخلاتك وافتراضات الطريقة. يستخدم الحساب العشري 50 رقمًا معنويًا، لكن التقديرات والأساليب العددية وبيانات المصدر قد تكون أقل دقة؛ تقريب القيم المعروضة لا يزيل هذه الحدود. أمثلة محلولة جرى التحقق منها بمصادر مستقلة: 6. مثلًا، يجري التحقق من «⁨50 GB at 100 Mbit/s with no overhead⁩» بالرجوع إلى ⁨Python 3.8: 50e9 × 8 / 100e6 = 4000 s⁩.

ما مصدر هذه الطريقة؟

IEC 80000-13:2008 — decimal (kB, MB, GB) and binary (KiB, MiB, GiB) prefixes for bytes; IEEE 802.3 Ethernet: 8-byte preamble, 14-byte header, 1500-byte payload, 4-byte FCS and 12-byte inter-frame gap (1538 bytes per full frame); NIST — Prefixes for binary multiples.

حول هذه الحاسبة

\begin{aligned} t &= \frac{8 \times \text{bytes}}{\text{rate} \times (1 - \text{overhead})} \\[4pt] \text{monthly} &= \text{views} \times \text{page weight}\end{aligned}

المصادر

IEC 80000-13:2008 — decimal (kB, MB, GB) and binary (KiB, MiB, GiB) prefixes for bytes
IEEE 802.3 Ethernet: 8-byte preamble, 14-byte header, 1500-byte payload, 4-byte FCS and 12-byte inter-frame gap (1538 bytes per full frame)
NIST — Prefixes for binary multiples

تم التحقق بالرجوع إلى المصادر

تتضمن هذه الحاسبة أمثلة محلولة بإجابات من مصادر مستقلة، وعددها 6. تُشغّل ضمن مجموعة الاختبارات، ويمكنك تشغيلها هنا أيضًا.