Calculate the monthly deposit needed to reach a target amount within a given number of years, including interest.
How is the required monthly deposit calculated?
This is the inverse of the savings-goal calculation: given the target, the horizon and the rate, the calculator solves the future-value formula for the monthly deposit: P = FV·r/((1+r)n − 1).
Example
Reaching $100,000 in 5 years at 4% annual interest requires about $1,508/month. Without interest — $1,667/month. The gap is the interest your savings earn.
Existing savings reduce the required deposit: they are grown over the full horizon before the remaining gap is computed.
💡 Useful Tips
Automate the deposit on payday — automatic saving beats saving "what is left".
Recalculate yearly with your actual balance and current rates.
This is an estimate, not investment advice.
Frequently Asked Questions
Are deposits at the start or end of the month?
End of month. Start-of-month deposits earn slightly more interest, so slightly less would be needed.
What about savings I already have?
Enter them under current savings — they compound over the whole horizon and reduce the required deposit.