TB to Mbps: data volume to sustained speed
One terabyte a month averages out to about 3.04 Mbps of continuous traffic. Enter an amount and a period to get the sustained speed, or switch modes to see how much data a given speed moves per day, week or month.
A month here is the average calendar month: 30.436875 days.
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How the conversion works
A data volume per period is a speed spread over a long time. Convert the amount to bits and divide by the seconds in the period:
Mbps = TB × 8,000,000 ÷ seconds in the period
A day has 86,400 seconds and a week 604,800. For months the calculator uses the average month of 30.436875 days (2,629,746 seconds), so results do not jump between 28- and 31-day months. The reverse mode multiplies instead: a line running at 100 Mbps non-stop moves 1.08 TB a day, 7.56 TB a week and about 32.87 TB in an average month.
Examples: caps, egress and backups
- A home data cap. A 1,200 GB (1.2 TB) monthly cap is used up by an average of about 3.65 Mbps around the clock. That sounds tiny, but a household streams in bursts; the data usage calculator estimates monthly GB from hours of activity instead.
- Server egress. A site that serves 10 TB a month averages about 30.42 Mbps. Traffic is uneven, so size the port for peaks several times higher. The bandwidth calculator adds a peak factor for exactly this.
- Nightly backups. Replicating 500 GB every day to another site needs an average of about 46.3 Mbps. If the job must finish in an 8-hour window, it needs three times that, about 139 Mbps, because the same data is squeezed into a third of the day.
- A weekly archive. 1 TB a week averages about 13.23 Mbps.
Pitfall: average vs peak
The result is the average speed if the data flowed evenly all period. Real traffic is lumpy, so a link sized to the average will be congested at busy times. Treat the figure as the minimum, and use the data transfer calculator for a specific time window. Also note that TB here is decimal (1,000,000,000,000 bytes); a backup tool reporting TiB is about 10% larger per unit. For short-term rates in gigabytes, GB/s to Mbps is the better fit.
Frequently asked questions
How many Mbps is 1 TB per month?
About 3.04 Mbps. 1 TB is 8,000,000 megabits, and an average month has 2,629,746 seconds, so 8,000,000 ÷ 2,629,746 ≈ 3.04 Mbps.
How much data can a 100 Mbps connection transfer in a month?
At full speed non-stop, about 32.87 TB in an average month of 30.44 days, or 1.08 TB per day. Real totals are far lower because connections are rarely busy all the time.
What speed do I need to upload 500 GB of backups every day?
Spread over 24 hours, about 46.3 Mbps of sustained upload. If the backup has to finish in a shorter window, divide by the fraction of the day available: in 8 hours it needs about 139 Mbps.
Which month length does the calculator use?
The average Gregorian month of 30.436875 days (365.2425 ÷ 12). A 31-day month gives slightly lower Mbps for the same volume, and a 28-day month slightly higher.