Download Time Calculator
How long a download takes at a given connection speed.
Quick answer
- Formula: Time = File size (bits) ÷ Speed (bits per second); 1 byte = 8 bits
- Worked example — Download time: 64.00 seconds (full example below).
Download Time Calculator
| Download time | 64.00 seconds |
| Download time | 1.07 minutes |
| Download time (h:m:s) | 0:01:04 |
An 800 MB file at 100 Mbps takes exactly 64 seconds (0:01:04) under ideal conditions: 800 × 8 = 6,400 megabits ÷ 100.
Enter a file size and a connection speed to get the transfer time. Decimal and binary units are kept strictly separate here: MB = 1000² bytes and GB = 1000³ bytes (what ISPs and disk makers use), while MiB = 1024² and GiB = 1024³ bytes (what operating systems often report).
Mind the factor of eight: speeds are usually advertised in megabits per second (Mbps), but files are measured in bytes. 100 Mbps delivers at most 12.5 MB per second. Real transfers are usually 5–15% slower than the ideal figure shown here because of protocol overhead and congestion.
The formula
Worked example
An 800 MB file at 100 Mbps takes exactly 64 seconds (0:01:04) under ideal conditions: 800 × 8 = 6,400 megabits ÷ 100.
The example is pre-loaded in the result panel — press Calculate with your own numbers to replace it.
Frequently asked questions
Why does my browser show a slower speed than my plan?
Browsers report megabytes per second while plans are sold in megabits per second — divide the plan speed by 8 to compare. A 100 Mbps plan shows at most about 12.5 MB/s in a browser.
What is the difference between MB and MiB?
MB is decimal (1,000,000 bytes); MiB is binary (1,048,576 bytes), about 4.9% larger. The gap grows with unit size: a GiB is about 7.4% larger than a GB.
Category: Everyday Life calculators
Sources & methodology
This calculator applies the formula shown on this page exactly as written, using the standard definitions for its inputs. Results are computed from the values you enter — no data is stored — and are rounded only for display.
Content last reviewed by CalcHub Editorial.
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