Initial value
Difference
Periods
Final value
Sum
This calculator deals with a linear number sequence - a set of values where every consecutive one differs by the same amount from the previous one. An example would be 20, 23, 26, 29 - it's a sequence of 4 numbers, with 20 as the initial value, 3 as the difference between successive figures, 29 as the final value and 98 as the sum of all numbers.
A practical example.
We're selling photo storage in the cloud. Customers pay us an amount of money that's directly proportional to the amount of data that they upload - $1 per 1 Gigabyte. Alice initially uploads 5GB of family photos and then adds 2GB per month. We want to know how much she stores after a year and how much her business is worth to us during that time. Below you'll find a table with all the values and a pre-filled calculator widget.
| Month | Payment | Sum |
|---|---|---|
| 1 | 5 | 5 |
| 2 | 7 | 12 |
| 3 | 9 | 21 |
| 4 | 11 | 32 |
| 5 | 13 | 45 |
| 6 | 15 | 60 |
| 7 | 17 | 77 |
| 8 | 19 | 96 |
| 9 | 21 | 117 |
| 10 | 23 | 140 |
| 11 | 25 | 165 |
| 12 | 27 | 192 |
Get the widget!
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