All Tools
Every calculator and utility on DoubleNeed, organized by category.
💵 Finance & Money
Pension Calculator
Defined-benefit pension estimate with a full breakdown.
Open tool →EMI Calculator
Monthly installment for bike, car, or home loans, plus total interest payable.
Open tool →Discount & VAT Calculator
Net price after percentage discounts or added VAT/tax.
Open tool →Split Bill Calculator
Divide a restaurant or event bill among friends, with tip & per-person breakdown.
Open tool →Currency Converter
Convert BDT to USD, INR, SAR, EUR and other major currencies.
Open tool →Electricity Bill Estimator (BD)
Estimate your monthly bill using current BERC tariff slabs.
Open tool →Salary After Tax (BD)
Net take-home salary after BD income tax slabs and deductions.
Open tool →Loan Prepayment Impact
Interest saved and tenure reduction from extra loan prepayments.
Open tool →Grocery Unit Price Comparator
Compare two pack sizes/prices to see which is the better value.
Open tool →Islamic Inheritance (Faraid) Calculator
Estimate Quranic estate distribution among spouse, children, and parents.
Open tool →Compound Interest Calculator
See how your investment grows with compound interest over time.
Open tool →Savings Goal Calculator
Find out how much to save monthly to reach your target.
Open tool →Tip Calculator
Quickly calculate tip amount and total bill per person.
Open tool →❤️ Health & Lifestyle
BMI Calculator
Check weight status based on height and weight.
Open tool →Water Intake Calculator
Daily recommended water intake based on weight & activity level.
Open tool →Sleep Cycle Calculator
Optimal bedtime or wake-up time based on 90-minute REM cycles.
Open tool →Period & Ovulation Tracker
Estimate cycle dates, fertile window, and next period start date.
Open tool →Calorie Deficit & TDEE Planner
Find your TDEE and daily calorie target for your weight goal.
Open tool →Intermittent Fasting Window
Eating and fasting windows for 16:8, 18:6, OMAD and more.
Open tool →🗓️ Date & Time
Age Calculator
Find your exact age in years, months, weeks, days, hours & minutes.
Open tool →Digital Clock & World Time
Live local time plus a world time converter.
Open tool →Date Difference Calculator
Exact gap between two dates in years, months, weeks & total days.
Open tool →Working Days Calculator
Total working days in a month or year, excluding weekends & holidays.
Open tool →Next Public Holiday (BD)
Countdown to the next Bangladesh government public holiday.
Open tool →📐 Math & Conversions
🏠 Home & Household
🚗 Cars & Transportation
Fuel & Mileage Calculator
Total fuel cost, distance covered, and per-km travel expense.
Open tool →CNG / Rickshaw Fare Estimator
Estimate trip fare by distance using standard local rates.
Open tool →Car Depreciation Calculator
Estimate your car's resale value over time.
Open tool →EV Charging Cost Calculator
Calculate the cost to charge an electric vehicle.
Open tool →🎓 Students & Education
✈️ Travel & World
🛍️ Shopping & Consumer
💼 Business & Freelancing
ROI Calculator
Calculate return on investment as a percentage and total gain.
Open tool →Break-Even Calculator
Find how many units you need to sell to cover your costs.
Open tool →Salary ↔ Hourly Calculator
Convert between annual salary and hourly wage.
Open tool →Pomodoro Timer
Focus timer with work/break cycles for productivity.
Open tool →