34 calculators and converters for everyday tasks
From EMI and loan calculators to BMI, calorie tracking, currency conversion, scientific calculations, and dozens of unit converters — this hub covers the calculations that come up regularly in personal finance, health monitoring, engineering work, and everyday problem-solving.
For professionals and everyday users: All calculations run in-browser and produce instant results. The financial calculators (EMI, Loan/Mortgage, Discount, Sales Tax) are particularly useful for quick scenario modelling without opening a spreadsheet.
34 Calculators & Converters
Each tool is purpose-built for a specific task. No bloat, no gated features.
EMI Calculator
Calculate Equated Monthly Instalments (EMI) for any loan — enter principal, interest rate, and tenure to get the monthly payment, total interest, and full amortisation schedule.
Loan / Mortgage Calculator
Calculate monthly mortgage payments, total interest paid, and amortisation schedules for home loans. Supports different repayment frequencies and extra payment scenarios.
Currency Converter
Convert between 150+ currencies using live or cached exchange rates. Useful for travel planning, international pricing, and cross-border financial calculations.
Discount Calculator
Calculate discounted prices, original prices from discounted amounts, or the percentage discount between two prices. Supports stacked discounts and GST/tax inclusion.
Sales Tax Calculator
Calculate sales tax, VAT, or GST amounts — add tax to a base price or extract tax from a tax-inclusive total. Configurable for any tax rate.
Percentage Calculator
Calculate percentages, percentage change, percentage of totals, and reverse percentage calculations — covering all common percentage scenarios in one tool.
Average Calculator
Calculate mean, median, mode, range, and standard deviation for any set of numbers. Useful for data analysis, grade averaging, and basic statistical work.
Scientific Calculator
A full-featured scientific calculator with trigonometric functions, logarithms, powers, roots, factorial, and memory functions — accessible in any browser.
Probability Calculator
Calculate single event probability, combined probability, conditional probability, and binomial distributions. Useful for statistics coursework and data science applications.
BMI Calculator
Calculate Body Mass Index from height and weight in metric or imperial units — with WHO classification, healthy weight range, and contextual interpretation.
Calorie & Macro Calculator
Calculate daily calorie needs based on TDEE and target macronutrient splits (protein, carbs, fat) from age, height, weight, gender, and activity level.
Age Calculator
Calculate exact age in years, months, and days from a date of birth to today or any target date. Also calculates days until the next birthday.
Date Difference Calculator
Calculate the difference between any two dates in days, weeks, months, and years — with working days calculation option. Useful for project planning, deadline tracking, and contract durations.
Time Zone Converter
Convert times between any two time zones worldwide — with automatic DST adjustment. Useful for scheduling international meetings and co-ordinating across distributed teams.
Time Converter
Convert between seconds, minutes, hours, days, weeks, months, and years. Useful for data retention calculations, API timeout values, and time-based engineering work.
Meeting Duration Calculator
Calculate total time spent in meetings across a day or week, with cost estimation based on hourly rate. Useful for evaluating meeting overhead and planning productivity improvements.
Temperature Converter
Convert between Celsius, Fahrenheit, Kelvin, and Rankine instantly. Covers all common scientific and everyday temperature conversion needs.
Length Converter
Convert between metric and imperial length units — mm, cm, m, km, inches, feet, yards, miles, and nautical miles. Useful for engineering, construction, and international product specs.
Weight Converter
Convert between grams, kilograms, tonnes, ounces, pounds, and stones. Covers everyday, scientific, and shipping weight conversion needs.
Area Converter
Convert between square metres, hectares, acres, square feet, square kilometres, and more. Useful for real estate, agriculture, and land measurement work.
Volume Converter
Convert between litres, millilitres, cubic metres, gallons, fluid ounces, pints, and more — covering metric, US, and UK volume units.
Speed Converter
Convert between km/h, m/s, mph, knots, and Mach number. Useful for aviation, motorsport, and physics calculations.
Pressure Converter
Convert between Pascal, kPa, MPa, bar, psi, atm, and mmHg. Useful for engineering, meteorology, and industrial applications.
Power Converter
Convert between watts, kilowatts, megawatts, horsepower, and BTU/hour. Useful for electrical engineering, appliance specification, and energy calculations.
Torque Converter
Convert between Newton-metres, foot-pounds, inch-pounds, and kilogram-force metres. Useful for automotive, mechanical engineering, and tool specification.
Angle Converter
Convert between degrees, radians, gradians, and turns. Useful for trigonometry, navigation, CAD work, and 3D modelling applications.
Number Base Converter
Convert numbers between decimal (base-10), binary (base-2), octal (base-8), and hexadecimal (base-16). Shows step-by-step conversion for educational use.
Roman Numeral Converter
Convert between decimal numbers and Roman numerals in both directions. Supports all standard Roman numeral values from 1 to 3,999.
Fraction / Decimal Converter
Convert fractions to decimals and decimals to fractions — with simplification and mixed number support. Useful for cooking, engineering, and mathematical work.
Byte / Bit Converter
Convert between bits, bytes, kilobytes, megabytes, gigabytes, and terabytes. Useful for storage sizing, network bandwidth calculations, and data retention planning.
Fuel Efficiency Calculator
Calculate and convert fuel efficiency between mpg (US/UK), L/100km, and km/L. Useful for comparing vehicle specifications across regional standards.
Grade Calculator
Calculate weighted and unweighted GPA, letter grade from percentage, and percentage needed on remaining assessments to achieve a target grade.
Tip Calculator
Calculate tip amounts and split bills between any number of people — with a custom tip percentage and optional rounding. The everyday calculator that comes up most at restaurants.
Electric / Voltage Converter
Convert between volts, amperes, watts, and ohms using Ohm's Law — and between electrical units for power calculation and appliance specification.
Common scenarios these tools solve
Purpose-built for professionals and everyday users who need fast, reliable results.
Personal Finance
Calculate EMI for loans, estimate mortgage payments, apply discount percentages, and work out sales tax on purchases without a spreadsheet.
Health & Fitness
Track BMI, calculate daily calorie and macro targets, and monitor fuel efficiency for fitness activities using purpose-built calculators.
Science & Engineering
Use the Scientific Calculator, unit converters (pressure, torque, power, angle), and Number Base Converter for technical calculations.
Travellers
Convert currencies, time zones, temperatures, and metric/imperial units in real time — covering the common conversions needed when travelling internationally.
Planners
Calculate date differences for project timelines, figure out meeting duration across time zones, and use the Age Calculator for deadlines and milestones.
Students
Use the Grade Calculator, Probability Calculator, Percentage Calculator, and Roman Numeral Converter for academic work and exam preparation.
Full Tool Index
A quick-reference table of key tools in this hub — what they do and when to use them.
| Tool | Category | Primary Use |
|---|---|---|
| EMI Calculator | Finance | Monthly loan payment + amortisation |
| Currency Converter | Finance | 150+ currencies with live rates |
| BMI Calculator | Health | BMI with WHO classification |
| Date Difference Calc | Date/Time | Days/weeks/months between dates |
| Temperature Converter | Units | Celsius, Fahrenheit, Kelvin, Rankine |
| Number Base Converter | Math | Binary, octal, decimal, hex |
| Scientific Calculator | Math | Full scientific calculator in-browser |
| Tip Calculator | Finance | Tip + bill splitting made simple |
Which tools to use — and when
Match your task to the right tool or sequence of tools.
EMI → Mortgage
Estimate monthly EMI, then model a full mortgage amortisation.
Go to tool Health CheckBMI → Calorie Calc
Calculate BMI, then set daily calorie and macro targets.
Go to tool International TripCurrency → Time Zone
Convert currency, then check time zone differences for scheduling.
Go to tool Engineering TaskUnit Converters
Choose from pressure, torque, power, angle, or length converters as needed.
Go to tool Project PlanningDate Difference → Meeting Duration
Calculate project timeline, then estimate meeting overhead cost.
Go to tool Student WorkflowGrade Calc → Percentage Calc
Track current grade, then calculate what score is needed on final exams.
Go to tool