Savings Goal Calculator – Monthly Deposit
Find the equal month-end deposit needed to reach a savings target at a fixed assumed return.
Formula
Deposit = max(0, (target − principal×(1+r)^n)×r / ((1+r)^n−1)); r = annual%/1200.
Required monthly deposit ≈ max(0,((10,000)-(1,000)×exp((60)×log1p((5)÷1200)))×((5)÷1200)÷expm1((60)×log1p((5)÷1200)))
How to use
- Enter your goal and current savings.
- Set the number of months and assumed annual return.
- Read the required month-end deposit.
Examples
- Target 2200, savings 1000, 12 months at 0% require 100 per month.
Frequently asked questions
When are deposits added?
At each month end, after monthly growth.
Why can the required deposit be zero?
Your existing savings already reach the target under the entered assumptions.
Are tax, fees or changing returns included?
No. The rate is an assumption, not a promised bank or market return.
Sources
Updated: