Udhaar / Loan Interest Calculator
Simple or compound interest from principal, rate and period
No matches
Interest
Total Amount
Interest / Month
Udhaar / Loan Interest Calculator — Complete Guide & Instructions
MakeCard Udhaar / Loan Interest Calculator works out how much interest a loan or informal udhaar amount earns — in both simple and compound modes. Enter the principal, annual rate and period, and it instantly shows total interest, final amount and the effective interest per month. It is handy for small lenders, kirana credit accounts, and borrowers verifying what a lender is charging.
How to Use Udhaar / Loan Interest Calculator
- 1 Pick the “Simple Interest” or “Compound Interest” tab.
- 2 Enter the Principal amount in rupees (e.g. 50000).
- 3 Fill in the Rate % per year (e.g. 12) and the Period in years — halves like 2.5 are allowed.
- 4 In compound mode, choose the Compounding frequency — Yearly, Half-yearly, Quarterly or Monthly.
- 5 Read Interest, Total Amount and Interest / Month in the stat cards — they update live as you type.
Key Features & Capabilities
- Both simple interest (SI = PRT/100) and compound interest (A = P(1+r/n)ⁿᵗ) in one screen.
- Four compounding frequencies — yearly, half-yearly, quarterly and monthly.
- Live results as you type — no calculate button to press.
- Shows effective interest per month so monthly-rate quotes are easy to compare.
- Accepts fractional periods like 0.5 or 2.5 years for short-term udhaar.
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Inputs | Principal (₹), annual rate %, period in years (0.5 steps) |
| Modes | Simple interest · Compound interest |
| Compounding | Yearly, half-yearly, quarterly, monthly |
| Outputs | Interest earned, total amount, interest per month |
| Processing | Instant, 100% client-side |
Practical Everyday Use Cases
- Computing interest on an informal udhaar loan between shopkeepers and customers.
- Comparing what a 12% yearly rate really costs under monthly vs yearly compounding.
- Estimating interest payable on a personal loan or chit-fund contribution.
- Converting a quoted “₹2 per ₹100 per month” rate into an annual figure.
- Teaching students the difference between SI and CI with live numbers.
Pro Tips for Best Results
- A “2% per month” lending rate is 24% simple per year — enter 24 to compare it honestly against bank rates.
- Watch the Interest / Month card: it is the fastest way to sanity-check whether a lender's quote is reasonable.
- More frequent compounding always earns more — compare Quarterly vs Monthly on the same rate to see the gap.
- For periods under a year, divide months by 12 (6 months = 0.5 years) before entering.
Common Problems & Solutions
The tool expects an annual rate. Convert monthly rates first — 2% per month ≈ 24% per year for simple, slightly more when compounded.
The Period field is in years, not months. Enter 0.5 for six months or 0.25 for three months.
Check the compounding dropdown — Yearly compounding earns less than Monthly at the same stated rate.
Privacy & Security
100% Client-Side Execution
Every calculation happens locally in your browser — loan amounts and rates are never sent to or stored by MakeCard.
Frequently Asked Questions
Everything you need to know about using Udhaar / Loan Interest Calculator
SI = (Principal × Rate × Time) ÷ 100, where rate is annual and time is in years. On ₹50,000 at 12% for 2 years, SI = ₹12,000.
Simple interest is charged only on the original principal. Compound interest adds each period's interest to the principal, so you earn (or pay) interest on interest — growing faster over time.
Enter your principal and annual rate, pick Monthly compounding, and read the “Interest / Month” stat — it shows the effective monthly interest amount.
Informal lending is common but governed by state money-lending laws — excessive rates may be unenforceable. This tool only does the math; consult local regulations for limits.
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