Savings Calculator
Project how your savings could grow with a starting balance, monthly deposit, annual interest rate, and time period. This is one of the most practical calculators on PercentNinja for everyday financial planning, emergency funds, house deposits, and long-term savings goals.
A calculator like this helps you see the combined effect of regular contributions and compound growth. Even small monthly deposits can make a meaningful difference over time, especially when interest keeps building on earlier deposits and earlier gains.
Calculate savings growth
Result explanation
Projected savings is the estimated end balance after your chosen number of years. Total deposited shows how much money you personally contributed, including the starting balance and all monthly deposits. Interest earned shows the extra growth generated by compounding, above and beyond what you put in yourself.
Approx monthly interest at end gives a rough idea of how much interest the balance could be producing per month by the end of the saving period. This is a useful way to understand how compound growth becomes more meaningful as the pot gets larger.
How it works
This calculator assumes monthly compounding and monthly deposits. That makes it useful for ISA-style saving, emergency funds, house deposit plans, and general savings goals where you contribute regularly rather than as a one-off lump sum.
If the interest rate is zero, the result is simply your starting balance plus all monthly deposits. Once you add a positive rate, the balance grows faster because earlier deposits continue earning interest in future months.
Worked examples
Example 1: House deposit plan
Start: £5,000
Monthly deposit: £200
Rate: 4% per year
Time: 10 years
This setup shows how a steady monthly saving habit can build a much larger balance than simply holding cash with no interest.
Example 2: Emergency fund growth
Suppose you already have £2,000 saved and add £100 per month for 5 years. Even at a modest savings rate, the final balance will exceed your total deposits because interest compounds on the growing pot throughout the full period.
When to use this calculator
Use this page when you want to model a regular saving plan rather than a one-off investment. If you want to test a lump sum with flexible compounding frequencies, use the Compound Interest Calculator. If you want to compare growth rates over time, use the CAGR Calculator. For borrowing costs instead of savings growth, use the Loan Interest Calculator.