Growth & Change

Saving toward a target

Calculate how long it takes to reach a target when you add a fixed amount regularly:

time from $20k to $40k at $2k every month in months → 10 months

Percentage growth

Calculate how a quantity grows when it increases by a percentage each period:

20k after 6 months at 10% per month → 35,431 (rounded)

Each month’s increase applies to the previous month’s total, including earlier growth.

Time to reach a target

If your user base grows by 10% each month, how long will it take to grow from 20,000 to 100,000 users?

time from 20k to 100k at 10% growth per month → 16.89 months

This assumes the growth rate stays constant.

Finding a growth rate

If a quantity grows from 10,000 to 15,000 over a week, calculate the equivalent daily growth rate:

growth per day from 10k to 15k over 1 week → 6%

This is the constant daily percentage increase that would produce the same overall growth.