Does the worksheet come with an answer key?

Yes. Every worksheet has a matching answer key, and the student page grades each answer automatically.

Can I set the principal, rate, and years?

Yes. You choose the range for the starting amount, the yearly rate, and the number of years, so problems can be simple or realistic.

What grade is compound interest for?

It usually appears from grade 10 upward and in financial literacy or economics units, once students can work with percentages and powers.

Yes. The tool is free, runs in your browser, and needs no account. Print or save each worksheet as a PDF.

Formula Worksheet Maker

Compound Interest Worksheet Generator

Build a printable compound-interest worksheet with an answer key. Set the ranges for the starting amount, rate, and years, generate a fresh set of problems, and let the student page grade the answers.

Make a compound-interest worksheet → Free · runs in your browser · answer key included

The formula

A = P × (1 + r/100)ᵗ

Compound interest pays interest on interest. Each year the balance grows by the rate, and the following year's growth is worked out on the new, larger balance. In the formula, P is the starting amount, r is the yearly rate written as a percent, and t is the number of years. A is the final balance once the interest has been added.

A worked example

£1,000 is invested at 5% per year for 3 years. Find the final balance.

Work out the yearly multiplier: 1 + 5/100 = 1.05.

Raise it to the power of the years: 1.05³ = 1.157625.

Multiply by the starting amount: 1,000 × 1.157625 ≈ 1,157.63.

Final balance ≈ £1,157.63

The main thing to sort out is the difference from simple interest. Simple interest is worked out on the original amount every year, so it grows by the same amount each time. Compound interest grows on the running balance, so each year adds a little more than the last. Mixing the two is the most common error on this topic.

Sample problems

£500 is invested at 4% per year for 2 years. Find the final balance. (≈ £540.80)
£2,000 is invested at 6% per year for 5 years. Find the final balance. (≈ £2,676.45)
£1,500 is invested at 3% per year for 10 years. Find the final balance. (≈ £2,015.87)
£800 is invested at 5% per year for 4 years. Find the final balance. (≈ £972.41)

In the tool you set the ranges for the starting amount, the rate, and the number of years, so each worksheet is a different set.

Who it's for

Compound interest usually appears from grade 10 upward, and in financial literacy and economics units where students meet real money problems. It works for classroom practice, exam prep, and lessons on saving and borrowing, especially when paired with a look at simple interest for contrast.

How to make one

Open Formula Worksheet Maker.
Drag the Compound Interest formula onto the sheet.
Set the ranges for the starting amount, the yearly rate, and the number of years.
Generate the student page, the questions PDF, and the answer key.
Print it, or save as a PDF and reuse it. Regenerate for a fresh set anytime.

Questions people ask

Does the worksheet come with an answer key?: Yes. Each sheet has a matching key, and the student page checks every answer against it.
Can I keep the years and rates realistic?: Yes. You set the ranges for the rate and the number of years, so the problems can mirror real savings scenarios.
Does it cover simple interest too?: This page uses the compound-interest formula. For a side-by-side lesson, you can run simple-interest problems separately and compare the results.
Is it free to print?: Yes. The tool is free, runs in your browser, and needs no account. Print or save each worksheet as a PDF.

Ready to make your worksheet?

Set your principal, rate, and time ranges and generate a compound-interest worksheet with its answer key.

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