Fixed Deposit Calculator

Fixed deposits lock money for a set term in exchange for a fixed contracted rate. The maturity amount depends on principal, rate, term, and compounding frequency. Quarterly compounding is standard; annual elsewhere. This calculator handles both.

10,000 at 7% for 5 years with quarterly compounding matures to 14,148. The same at annual compounding gives 14,026 - a small but real difference. More frequent compounding always produces higher returns; over long terms the gap widens noticeably.

Fixed deposits are low-risk. The rate is fixed at origination so inflation risk is real - a 7% FD during 5% inflation has just 2% real return. Compare the rate to long-term government bond yields (similar risk) rather than savings account rates (shorter term, lower risk).

A worked example

With the defaults: principal of 10,000, annual rate of 7%, term of 5, compounding frequency of 4. The tool returns 14,147.78. You can adjust any input and the result updates as you type — no submit button, no reload. That's the real power here: seeing how sensitive the output is to one or two assumptions.

What moves the number most

The result responds to Principal, Annual Rate, Term, and Compounding Frequency. Not every input has equal weight. Adjusting one input at a time toward extreme values shows which ones move the result most.

The formula behind this

Standard compound interest formula: Maturity = Principal × (1 + rate/frequency)^(frequency × years). Everything the calculator does is shown in the formula box below, so you can check the math against your own spreadsheet if you want.

Why run this

Running the numbers makes the trade-offs concrete. Small changes in the inputs can move the result more than intuition suggests, which is hard to judge without working it out.

What this doesn't capture

This is a simplified model that holds its assumptions constant. Real outcomes vary with market conditions, costs, taxes, and timing, so the figure is best read as one scenario rather than a forecast.