Simple Interest Calculator

Work out locally simple interest without compounding: interest and final balance from principal, rate and term - no upload.

€500.00

Interest

€1,500.00

Final balance

Capital growth

Capital growth
#	Wert
1	1000
2	1050
3	1100
4	1150
5	1200
6	1250
7	1300
8	1350
9	1400
10	1450
11	1500

Year by year

Year by year
Year	Interest	Balance
1	€50.00	€1,050.00
2	€100.00	€1,100.00
3	€150.00	€1,150.00
4	€200.00	€1,200.00
5	€250.00	€1,250.00
6	€300.00	€1,300.00
7	€350.00	€1,350.00
8	€400.00	€1,400.00
9	€450.00	€1,450.00
10	€500.00	€1,500.00

No upload100% local

Your content stays with youno third-party access

Servers in GermanyGDPR by design

Independently auditedTLS A+ · HTTP headers A+

Is my file uploaded?

No. Everything runs in your browser - your file never leaves your device. How this is verifiable

With simple interest the interest is paid each year only on the original principal - not on interest already credited. As a result the capital grows linearly, that is by the same amount every year. From the principal, the rate and the term this calculator shows the total interest and the final balance, plus a year-by-year table and a straight-line chart of the balance.

The calculation runs entirely locally in your browser, in pure JavaScript - nothing is uploaded and nothing is stored. The yearly interest is principal times rate divided by 100; the total interest is that amount times the term, and the final balance is principal plus interest. Unlike compound interest the yearly interest amount stays constant. Change an input and the figures, table and chart update instantly.

An honest note: simple interest is rare in practice - most savings products and loans use compound interest, where interest earns interest too. For that more common case use the compound-interest calculator, for an annuity loan the loan calculator. The amounts are shown in euros as an example; the maths applies to any currency. Not financial advice.

Specifications

Specifications
Input formats	Form inputs (no file)
Processing	Locally in your browser (JavaScript)
File upload	None

In 3 steps

Enter the principal.
Enter the annual rate and the term.
Read off the interest, final balance and year-by-year breakdown.

Limitations: Simple interest without compounding (linear growth); in practice most products use compound interest. For that case use the compound-interest calculator, for a loan the loan calculator. Amounts in euros as an example. Not financial advice.

FAQ

Are my inputs uploaded?

No. The calculation runs entirely locally in the browser (pure JavaScript); nothing is sent or stored.

What is the difference to compound interest?

Simple interest is paid only on the starting capital, so the amount stays the same every year. With compound interest the interest earns interest too, so the capital grows faster.

How is the interest calculated?

Interest = principal times rate divided by 100 times the term. Example: 1000 at 5 % over 10 years gives 500 in interest.

When is simple interest used?

Mostly for short terms under a year and some bonds. Most savings and loan products use compound interest.