How it works
Monthly rate = nominal annual rate/12. Grow the balance each month; add deposits at the selected start or end of month.
Input definitions
- Starting balance
- Enter the value in the labeled unit.
- Monthly contribution
- Enter the value in the labeled unit.
- Nominal annual interest (%)
- Enter the value in the labeled unit.
- Months
- Enter the value in the labeled unit.
- Deposit timing
- Choose End of month / Start of month.
A worked example
- Starting balance
- 1000
- Monthly contribution
- 100
- Nominal annual interest (%)
- 0
- Months
- 12
- Deposit timing
- End of month
Assumptions & limits
Single-currency planning model using entered rates; two-decimal half-up currency rounding. No taxes, regulatory APR, live quote or investment-return prediction unless explicitly stated.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-17. Content checked against the stated method and examples. Our verification approach.
Common questions
Are these investment and borrowing results guaranteed?
No. These are deterministic estimates from the inputs and stated method, not predicted returns or lending offers. Actual fees, tax, timing and contractual terms may differ.
How does the Savings with monthly contributions tool work?
Monthly rate = nominal annual rate/12. Grow the balance each month; add deposits at the selected start or end of month.
What are the assumptions and limits of Savings with monthly contributions?
Single-currency planning model using entered rates; two-decimal half-up currency rounding. No taxes, regulatory APR, live quote or investment-return prediction unless explicitly stated.