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Simple Interest Calculator

Simple Interest Calculator

Quick interest on any amount

₹
%
Years Months Days
%
%
Simple interest
0
P × R × T ÷ 100
Total amount
0
principal plus interest
Principal
0
Inflation-adjusted total
0
in today's money
Post-tax total
₹0
Principal vs interest

Simple interest is calculated only on the original principal for the whole period — unlike compound interest, it never earns interest on interest already accrued. Most loans and investments in practice use compound interest; this is the quicker, older-style calculation still used for some short-term loans and specific instruments.

Tax: if you're the one earning this interest (a deposit or a loan you gave), it's taxable at your slab rate as "income from other sources" — set your slab above for the post-tax figure. Interest paid by a bank sees 10% TDS past ₹50,000/yr (₹1L for seniors); interest from an individual or company sees no TDS but is equally taxable. If instead you're paying this interest on a personal loan, there's no tax angle — set the slab to 0.

What to work out next

Post-tax Yield Comparator

FD vs debt fund vs equity fund vs PPF/SSY, ranked after tax.

FD vs Debt Mutual Fund Calculator

Guaranteed slab-rate tax, or market-linked slab-rate tax.

Inflation Calculator

See what today's rupee is worth years from now.

TDS Calculator

Work out the TDS a bank deducts on your FD/RD interest.

Emergency Fund Calculator

Size your safety net and see how fast you can build it.

PPF Calculator

See what your PPF account grows to at maturity.

Frequently asked questions

Is a fixed deposit still worth it compared to other options?

It depends on your goal -- fixed deposits offer safety and a guaranteed return, which suits short-term goals or emergency funds, but their returns often barely keep pace with inflation after tax. For long-term goals, market-linked options have historically outperformed fixed deposits, at the cost of guaranteed safety.Read more: Simple Interest Calculator: Quick Interest on Any Amount

What's the difference between simple and compound interest?

Simple interest is calculated only on the original principal for the entire period. Compound interest is calculated on the principal plus any interest already earned, so the amount it's calculated on grows over time. Compounding produces a meaningfully larger result the longer the money is invested.Read more: Your NBFC Fixed Deposit Has Zero Government Insurance — Unlike a Bank FD

How much emergency fund should I keep?

A common guideline is 3-6 months of essential expenses in an easily accessible account, though this varies by job stability, dependents, and other safety nets available to you. It should be liquid and low-risk, not invested for growth, since the point is availability when you need it, not returns.Read more: Breaking Your FD Early Costs More Than the Penalty Alone

Are savings account returns taxable?

Generally, yes -- interest earned is typically taxable as regular income, though some jurisdictions offer a small exemption threshold on savings interest specifically. Check the current rule where you file, since this is one of the more frequently adjusted thresholds.Read more: FD Real Returns After Tax and Inflation: The Number Your Bank Never Shows You

Estimates only, not financial advice. See our Disclaimer.