Free Unit Converter, Currency Converter, BMI, Age & Percentage Calculator
Unit converter tools solve a problem that comes up constantly and rarely deserves its own dedicated app: turning one measurement into another without doing the math by hand or trusting a rough mental estimate. Along with four other quick calculators, including a live currency converter, this page covers the handful of everyday conversions and calculations people search for the most.
Unit conversions, currency exchange, BMI, age, and percentage calculations — five handy calculators in one place, all instant and free.
What Do These Five Calculators Do?
This page combines a unit converter, a currency converter, a BMI calculator, an age calculator, and a percentage calculator into one place. The unit converter switches between length, weight, temperature, volume, and speed units. The currency converter converts between major world currencies, including PKR, using live daily exchange rates. The BMI calculator estimates a body mass index from height and weight. The age calculator works out exact age, or the time between any two dates, down to the day. The percentage calculator handles the three most common percentage questions people run into.
They’re grouped because each one answers a quick, specific question that would otherwise mean opening a search engine, typing out a manual formula, or trusting a rough guess.
How to Use the Unit Converter
Converting a measurement takes only a few seconds.
Pick a category. Choose length, weight, temperature, volume, or speed from the dropdown.
Choose your units. Select the unit you’re converting from and the unit you want to convert to. The swap button flips both instantly if you picked them backwards.
Enter your value. Type in the number you want converted, and the result updates immediately as you type.
How to Use the Currency Converter
Converting between currencies uses live, daily-updated exchange rates rather than fixed numbers.
Enter an amount. Type the amount you want to convert.
Choose your currencies. Select the currency you’re converting from and the one you’re converting to, including PKR alongside major currencies like USD, EUR, GBP, INR, and AED. The swap button flips both instantly.
Read the converted amount. The result updates automatically, along with the exact exchange rate used and the date it was last updated, so you know how current the numbers are.
How to Use the BMI Calculator
Body mass index gives a quick, general sense of whether a person’s weight falls in a typical range for their height.
Choose your unit system. Switch between metric (centimetres and kilograms) and imperial (feet, inches, and pounds).
Enter your height and weight. The calculator computes your BMI instantly and shows which general category it falls into.
Read the result with context. BMI is a screening number, not a diagnosis, and it doesn’t account for muscle mass, bone density, or body composition, so it’s worth treating as one data point rather than a complete picture of health.
How to Use the Age Calculator
Working out an exact age, or the gap between two dates, is a one-step process.
Enter a date of birth. This is the starting point for the calculation.
Choose the date to calculate against. This defaults to today but can be changed to calculate age as of any specific date.
Read the full breakdown. The result shows age in years, months, and days, along with total days and weeks lived, and a countdown to the next birthday.
How to Use the Percentage Calculator
Percentage questions come in a few common forms, and this tool covers the three types people search for most.
Pick the type of question you have. Choose “X% of Y” to find a portion of a number, “X is what % of Y” to find what percentage one number represents of another, or “% change from X to Y” to find an increase or decrease between two values.
Enter your numbers. The result updates instantly as you type, labelled clearly based on which calculation mode is selected.
Why These Five Tools Are Useful Together
Each of these calculators solves a narrow problem, but the questions they answer come up in overlapping, everyday situations. Someone following a recipe from another country needs to convert grams to cups or Celsius to Fahrenheit. Someone planning to travel, shop from an international store, or send money abroad needs to know what an amount in one currency is actually worth in another, using a rate that’s current rather than a rough guess. Someone tracking a fitness goal wants a quick BMI reference alongside other measurements. Someone filling out a form needs to know their exact age as of a specific date rather than just their age in years. Someone comparing two prices, two exam scores, or two months of sales figures needs a percentage change, not just the raw numbers side by side.
Common Situations Where These Calculators Help
A student converts a recipe or a science measurement between metric and imperial units for a school assignment. Someone applying for a visa or a legal document needs their exact age in years, months, and days as of a specific date, not just their age this year. A shopper compares a discounted price to the original to check whether a “% off” claim on a sale tag actually adds up. Someone monitoring their health tracks their BMI over time alongside other measurements from a doctor or a fitness routine. A freelancer working with an international client checks what a payment in USD or GBP actually comes out to in PKR before agreeing on a rate.
A Note on Choosing the Right Unit Converter Category
Picking the correct category in a unit converter matters more than it seems, since some conversions look similar but use entirely different formulas. Temperature is the clearest example: converting Celsius to Fahrenheit isn’t a simple multiplication like converting kilometres to miles; it requires an offset calculation, which is why temperature is handled separately from other measurement types in most unit converter tools, including this one. Volume conversions can also trip people up internationally, since a US cup, a UK cup, and a metric cup are not the same size, so it’s worth double-checking which regional standard a recipe or reference is using before trusting a converted number exactly.
Frequently Asked Questions
Are these calculators free to use?
Yes, all four calculators are completely free, with no sign-up required.
Which unit categories does the converter support?
The unit converter currently supports conversions for length, weight, temperature, volume, and speed.
Does the currency converter support PKR?
Yes, Pakistani Rupee is included alongside major currencies like USD, EUR, GBP, INR, and AED, using daily-updated exchange rates.
How current are the currency exchange rates?
Rates update daily, and the tool shows the exact date they were last refreshed. They may lag slightly behind real-time market rates, so double-check before relying on them for a large transaction.
Is BMI an accurate measure of health on its own?
No, BMI is a general screening tool based only on height and weight. It doesn’t account for muscle mass, bone density, age, or sex, so it’s best used alongside other health measures rather than on its own.
Can the age calculator work out the time between two dates that aren’t today?
Yes, change the “Calculate Age As Of” field to any date to find the exact gap between two specific dates.
Does the percentage calculator handle percentage decrease as well as increase?
Yes, the “% Change from X to Y” mode automatically shows a negative result when the second value is lower than the first.
Related Tools
If you found this useful, a couple of other free tools pair well with it: a Tax and Zakat Calculator Suite for GST, income tax, and Zakat calculations, and a Word and Character Counter for checking text length.