Simple Interest Calculator Online

School problems and some short-term loans still use simple interest: interest that doesn’t compound on itself. The formula is straightforward — the mistakes come from mixing months and years.

Simple Interest Calculator computes I = P × R × T style results when fields match. For growth that compounds, use Compound Interest. For installment loans, see EMI Calculator.

Example

Principal $2,000, rate 6% per year, time 2 years:

• Interest = $240
• Amount = $2,240

Steps

1. Open Simple Interest Calculator.
2. Enter principal, rate, and time in consistent units.
3. Read interest and total amount.
4. Cross-check word problems for “per month” vs “per year.”

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FAQ

Same as compound interest?

No — compound adds interest on interest.

Private?

Yes.

Time in months?

Convert to years (e.g., 6 months = 0.5) if the rate is annual, unless the tool has a months field.