Bandwidth & Data Transfer Calculator
Convert link speed to monthly data transfer, monthly data to average speed, and work out how long a file takes to move.
1. Speed → data per month
2. Data per month → average speed
3. File transfer time
Free, no sign-up. Everything runs in your browser.
Formulas used
- Data volume = speed (bits/second) × utilization × number of seconds ÷ 8.
- Average speed = data volume (bytes) × 8 ÷ number of seconds.
- Transfer time = file size (bytes) × 8 ÷ (speed × efficiency).
A month is counted as 30 days (2,592,000 seconds). Units are decimal: 1 TB = 1,000 GB = 1012 bytes.
Quick reference: full speed 24/7 for 30 days
| Speed | Total data per month |
|---|---|
| 1 Mbps | 0.32 TB |
| 10 Mbps | 3.24 TB |
| 100 Mbps | 32.4 TB |
| 1 Gbps | 324 TB |
How many Mbps is a VPS Artisan allowance?
The monthly transfer allowance of each VPS Artisan plan, converted to an average speed spread evenly over 30 days:
| Plan | Monthly allowance | Average equivalent |
|---|---|---|
| Cumulus | 1 TB | ≈ 3.1 Mbps |
| Altocumulus | 3 TB | ≈ 9.3 Mbps |
| Cirrus | 7 TB | ≈ 21.6 Mbps |
| Stratus | 10 TB | ≈ 30.9 Mbps |
Website traffic is rarely even: busy during working hours and quiet at night. Peak speed can sit well above these averages as long as total monthly usage stays within the allowance.
Bits and bytes
Internet speed is always quoted in bits per second (Mbps), while file sizes are in bytes (MB, GB). Divide Mbps by 8 to get MB/s: a 100 Mbps connection downloads at most about 12.5 MB per second.
Frequently asked questions
How many Mbps is 1 TB of bandwidth?
A 1 TB monthly allowance works out to an average of about 3.1 Mbps if used continuously for 30 days (1 TB × 8 bits ÷ 2,592,000 seconds). Conversely, a 1 Mbps link running flat out 24 hours a day for 30 days transfers about 0.32 TB.
What is the difference between Mbps and MB/s?
Mbps (megabits per second) is the unit for network speed, while MB/s (megabytes per second) is the unit for data size per second that download apps usually show. 1 byte = 8 bits, so 100 Mbps is roughly 12.5 MB/s before protocol overhead.
Why are real transfers slower than the calculated result?
Protocol overhead (TCP/IP, TLS), latency, and disk or server performance on both ends all take a cut. That is why the calculator uses an efficiency factor; 85–95% is reasonable for a stable connection.
What is 95th percentile billing?
A common IP transit billing method: traffic is sampled every 5 minutes over the month, the top 5% of samples are discarded, and the highest remaining value becomes the billable rate. Short bursts do not raise the bill, but sustained high usage does.
Does this calculator use decimal or binary units?
Decimal, as network and hosting providers do: 1 GB = 1,000,000,000 bytes and 1 TB = 1,000 GB. Operating systems sometimes show binary units (GiB/TiB), which read about 7–10% smaller.
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