Interest Rate and Compound Interest Calculator / Solver.

Click here to launch the calculator

Use this calculator to work out Annual Percentage Rates, or perform calculations relating to loans and interest rates.

(Requires Flash Player 7 or higher).

You can use this calculator / solver to:

1. Work out the Annual Percentage Rate (APR) from a monthly rate of interest, or vice versa. (You can use change the interest period from monthly to daily, weekly, quarterly or half-yearly).

2. Work out the factors in Compound Interest Loan calculations, based upon three of the known factors. Therefore, you need to enter three of the following values:

Initial Value (i.e. the amount of money that is borrowed)
Interest Rate
The duration / length of the loan (in years)
The total amount of money that is repaid (i.e. initial value + interest)

Points to be aware of:

All results are rounded down to 4 decimal places, and this should be sufficient for most purposes. You can round this down further yourself (i.e. to 2 decimal places).

When enter 'part years' in the loan calculator (i.e. 7 years and 10 months), these need to be added as a fraction.

i.e. To work out 10 months as a decimal fraction, divide 10 by 12, and this gives the result 0.8 - therefore, enter 7.8 into the calculator. Any results calculated this way will also show the years and months underneath.

The figures projected by the calculator are only for guidance purposes - whilst we aim to ensure the accuracy of our calculators, we can take no responsibility for the usage made of the calculations generated on this site.

Recent Financial Topics

Among the companies with reports and trading updates today are Aston Martin, Severn Trent, Home REIT, Rathbones and Future.

BUSINESS LIVE: GDP grows 0.2%; Yew Tree ups Aston Martin stake; Severn Trent eyes £1bn fundraise
29/09/2023 09:26 AM

Energy bills will go down for most households on 1 October thanks to the new Ofgem price cap - but the proportion that goes towards electricity standing charges is going up.

Why are standing charges going up, when the energy price cap is falling?
29/09/2023 07:59 AM

While multi-angle photos of your newly decorated sun lounge may get things moving, unfortunately there's also a darker side to dishing up such forensic detail of your home.

How to sell your home safely - don't make it easy for criminals by giving away too much online
29/09/2023 06:31 AM