Loan Calculator Nigeria: How to Calculate APR, Total Cost & Monthly Payments

Loan shopping in Nigeria is made unnecessarily confusing by the way lenders quote their rates. Some say '3% per month', others say '1% per day', some list a 'flat fee', and others show an APR you cannot verify. This guide cuts through the jargon and gives you the exact formulas to calculate what any loan truly costs — so you can compare apples to apples.

The Key Loan Rate Concepts You Need to Know

Term	What It Means	Example	Watch Out For
Monthly rate (simple)	Interest on original balance each month	3%/month on ₦100K = ₦3,000/month	Flat vs reducing — clarify which
Monthly rate (reducing)	Interest on outstanding balance only	3% on ₦100K, falls as you repay	More borrower-friendly than flat
APR (Annual % Rate)	Annualised cost including fees	3%/month × 12 = 36% APR (simple)	Some lenders exclude fees from APR
Flat rate	Applied to original amount throughout tenure	3% flat on ₦100K = ₦3,000/month always	Equivalent to ~5.5–6% reducing balance
Processing fee	One-off fee deducted from disbursement	2% of ₦500K = ₦10K deducted upfront	Increases your effective APR significantly
Total cost of credit	All interest + all fees over loan life	₦100K at 3%/month × 6 months + ₦5K fee = ₦23K	Ask for this figure in naira before accepting

Quick Reference: Monthly Rate to APR Conversion Table

Monthly Rate (Flat)	Simple APR (×12)	Effective APR (Compounded)	Equivalent Reducing Balance Rate
1%/month	12% APR	12.68% APR	~1.8%/month reducing
1.5%/month	18% APR	19.56% APR	~2.7%/month reducing
2%/month	24% APR	26.82% APR	~3.6%/month reducing
3%/month	36% APR	42.58% APR	~5.5%/month reducing
4%/month	48% APR	60.10% APR	~7.4%/month reducing
5%/month	60% APR	79.59% APR	~9.3%/month reducing
10%/month	120% APR	213.84% APR	~19%/month reducing

How to Calculate Total Loan Cost in Nigeria: Worked Examples

Example 1: ₦200,000 personal loan at 3%/month flat for 6 months

Monthly interest: ₦200,000 × 3% = ₦6,000 per month
Total interest over 6 months: ₦6,000 × 6 = ₦36,000
Processing fee (2%): ₦4,000 (deducted from disbursement — you receive ₦196,000)
Monthly repayment: (₦200,000 + ₦36,000) ÷ 6 = ₦39,333
Total cost: ₦236,000 (₦36,000 interest + ₦4,000 fee)
Effective APR (including fee): approximately 51% — higher than the advertised 36% APR

Example 2: ₦1,000,000 mortgage at 6% per annum (NHF) over 20 years

Monthly rate: 6% ÷ 12 = 0.5% per month
Monthly payment formula: ₦1M × [0.005 × (1.005)^240] ÷ [(1.005)^240 − 1]
Monthly payment: approximately ₦7,164
Total paid over 20 years: ₦7,164 × 240 = ₦1,719,360
Total interest paid: ₦719,360 on a ₦1M loan
Compare to: same ₦1M at 25% p.a. = monthly payment ≈ ₦21,400; total paid ≈ ₦5,136,000

The rule of thumb for Nigerian borrowers

Any loan with APR above 60% (5%/month) — scrutinise very carefully; only borrow if absolutely necessary
Processing fees above 3% of loan amount are unusually high — negotiate or find another lender
Ask for the total cost in naira upfront — FCCPC guidelines require this disclosure
For loans above 3 months: use a reducing balance structure (more equitable and slightly cheaper)
Use CompareMarket's free loan calculator to compare total costs side by side before signing

Use our free loan calculator to compute your exact monthly payment and total cost.

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Frequently Asked Questions

What is the difference between a monthly rate and APR in Nigeria?+

A monthly rate is the interest charged per month (e.g., 3%). APR (Annual Percentage Rate) is the annualised cost including all fees. To convert a monthly rate to APR on a simple basis, multiply by 12 (3% × 12 = 36% APR). However, if the loan compounds monthly, the true APR is slightly higher: (1 + 0.03)^12 − 1 = 42.6% APR. Always ask lenders for the APR — it is required by FCCPC guidelines to be disclosed.

What is the difference between flat rate and reducing balance interest in Nigeria?+

A flat rate applies to the original loan amount throughout the tenure — so if you borrow ₦100,000 at 3%/month flat for 12 months, you pay ₦3,000 interest every month regardless of how much you've repaid. A reducing balance rate applies only to the outstanding balance — so as you repay, your interest charge falls. A 3% flat rate is roughly equivalent to 5.5–6% reducing balance. Most Nigerian fintech lenders use flat rates — so the headline rate looks lower than it truly is.

How do I calculate my monthly payment on a Nigerian loan?+

For a reducing balance loan: Monthly Payment = P × [r(1+r)^n] ÷ [(1+r)^n − 1], where P = principal, r = monthly interest rate, n = number of months. Example: ₦500,000 at 3%/month for 12 months → ₦500,000 × [0.03 × (1.03)^12] ÷ [(1.03)^12 − 1] = ₦500,000 × [0.03 × 1.4258] ÷ [0.4258] = ₦500,000 × 0.10046 = ₦50,230/month. Use our calculator above to skip the maths.

What fees should I include when calculating the true cost of a Nigerian loan?+

Always include: origination/processing fee (typically 1–3% of loan amount, deducted upfront), management fee (0.5–1%/month on some platforms), insurance fee (if required), late payment penalty (typically 1–5% of outstanding balance per occurrence), and any prepayment penalty if you want to close early. These can add 5–15% to the total cost of a loan beyond the stated interest rate.

Is it better to take a longer or shorter loan tenure in Nigeria?+

Shorter tenure = less total interest paid but higher monthly payments. Longer tenure = lower monthly payments but more total interest. Example: ₦1M at 3%/month — 6 months: monthly payment ≈ ₦198,000, total cost ≈ ₦1.19M. 12 months: monthly payment ≈ ₦111,000, total cost ≈ ₦1.33M. The 12-month option costs ₦140,000 more in total. Choose the shortest tenure your cash flow can comfortably accommodate.

Disclaimer: CompareMarket NG is an independent comparison service. Information is verified against regulatory databases (NAICOM, CBN, FCCPC, NDIC, NERC, NCC) and updated regularly, but rates and products change frequently. Always verify current terms directly with the provider before making a financial decision. This is not financial advice.