Bangladesh's Top 10 Free Online Calculators 2026

EMI, BMI, Income Tax, Salary, ROI and more — all in one place. Instant results, no signup required.

100% Free No Signup Needed NBR Updated 2026 Mobile Friendly

EMI Calculator

Monthly loan installment calculator

Loan Amount (৳)

Interest Rate (% per year)

Duration (months)

Income Tax Calculator 2025-26

National Board of Revenue (NBR)

Annual Gross Income (৳)

Taxpayer Category

ROI Calculator

Return on investment calculator

Total Investment (৳)

Total Return / Revenue (৳)

Duration (months, optional)

Profit Calculator

Profit margin & markup calculator

Selling Price (৳)

Cost / Purchase Price (৳)

Salary Calculator

Net salary & allowances breakdown

Basic Salary (৳)

House Rent (%)

Transport Allowance (৳)

Percentage Calculator

3 types of percentage calculations

Calculation Type

Value (X)

Percentage (Y%)

BMI Calculator

Body mass index — Asian standards

Weight (kg)

Height (cm)

Gender

Calorie Calculator

Daily calorie needs (TDEE)

Weight (kg)

Height (cm)

Age (years)

Gender

Activity Level

CGPA Calculator

Grade point to percentage converter

Enter CGPA

Select Scale

Age Calculator

Exact age & next birthday countdown

Date of Birth

ℹ️ About Our Platform

Bangladesh's Best Free Online Calculators 2026

Our free online calculators help you complete any calculation in seconds. Use the EMI calculator to find your monthly bank loan installment, the BMI calculator to check your body mass index, and the Income Tax Calculator 2025-26 to find your annual tax liability — all based on the latest National Board of Revenue (NBR) guidelines.

From students to business owners, our calculators are simple, accurate, and always up to date. No ads blocking your results, no login required — just fast, reliable answers.

Frequently Asked Questions (FAQ)

How does an EMI calculator work?

EMI = [P × r × (1+r)^n] ÷ [(1+r)^n - 1]. P = principal loan amount, r = monthly interest rate (annual rate ÷ 12 ÷ 100), n = total number of monthly installments.

What is the normal BMI range for Bangladeshis?

WHO Asian standards: Below 18.5 = Underweight. 18.5–22.9 = Normal. 23–27.4 = Overweight. 27.5+ = Obese.

What is the tax-free income limit in Bangladesh for 2025-26?

General taxpayer = ৳3,50,000. Female taxpayer = ৳4,00,000. Senior citizen (65+) = ৳4,00,000. Disabled person = ৳4,75,000.

What is the formula to convert CGPA to percentage?

On a 4.0 scale: CGPA × 25 = Percentage. On a 5.0 scale (HSC/SSC): CGPA × 20 = Percentage.

What is a ROI calculator used for?

ROI (Return on Investment) calculator measures the profitability of stock market, real estate, and business investments. Formula: ROI = (Return − Investment) ÷ Investment × 100.