Calculators that show their working
Money, tax, maths and games. Every answer comes with the steps behind it, side-by-side comparisons, and your own country's rules.
Islamic
Zakat, the Qibla direction and Hijri dates, worked out to the rules.
- Zakat CalculatorWork out the zakat due on your cash, gold, silver, investments and business stock, with the nisab checked for you.
- Hijri Date ConverterConvert Gregorian dates to Hijri and back on the Umm al-Qura calendar.
- Qibla Direction FinderThe exact Qibla bearing from true north and the distance to the Kaaba, for your city or any coordinates.
Money
Budgets, prices and everyday money maths, worked out step by step.
- Discount CalculatorThe sale price and how much you save, including "30% off then a further 10%" deals.
- Profit Margin CalculatorProfit, margin and markup from your cost and selling price, or the price to charge for a target margin.
- Savings Goal CalculatorHow much to put aside each month or week to reach a savings goal by a set time.
- Tip and Bill Split CalculatorAdd a tip and split the bill between friends, with optional rounding up.
- Break-Even CalculatorHow many sales you need to cover your fixed costs, from your price and cost per unit.
- Fuel Cost CalculatorPetrol cost of a trip from the distance, your car's mileage and the fuel price, split between passengers.
- Appliance Electricity Cost CalculatorUnits (kWh) and cost to run an AC, heater or any appliance, per day, month and year.
- Inflation CalculatorWhat things will cost in future years, and how much buying power your money loses to inflation.
Tax and salary
Take-home pay, income tax and end-of-service benefits under your own country's current rules.
- VAT and GST CalculatorAdd or remove VAT, sales tax or GST for the UAE, Saudi Arabia, Pakistan, the UK and India, or any rate.
- Pakistan Salary Tax Calculator 2026-27Monthly tax and take-home pay for salaried people in Pakistan under the 2026-27 tax bands.
- UAE Gratuity CalculatorEnd-of-service gratuity under the UAE Labour Law: 21 days' basic wage a year for 5 years, then 30 days.
- Saudi End of Service CalculatorEnd-of-service award under the Saudi Labour Law, including the reduced award when you resign.
- Salary to Hourly ConverterTurn any pay into hourly, daily, weekly, monthly and yearly figures, using your own working hours.
- Pakistan Gratuity CalculatorGratuity at 30 days' wages for each year of service, with a part year over six months counted.
Health
BMI and body measures with plain readings, including cut-offs for Asian populations.
- BMI CalculatorBody mass index in metric or imperial, with WHO bands and the lower cut-offs for Asian populations.
- Calorie CalculatorDaily calories to keep, lose or gain weight, from the Mifflin-St Jeor formula and your activity level.
- Pregnancy Due Date CalculatorEstimated due date, weeks pregnant and trimester from the first day of your last period.
- Body Fat CalculatorBody fat percentage from a tape measure using the US Navy method, with fat and lean mass.
- Ideal Weight CalculatorIdeal weight for your height from four classic formulas, beside the healthy BMI range.
- Water Intake CalculatorHow much water to drink a day for your weight, exercise and climate.
- Ovulation CalculatorYour likely ovulation day, fertile window and next period, for the next three cycles.
- Heart Rate Zone CalculatorMaximum heart rate and the five training zones, using your resting pulse if you know it.
- Sleep CalculatorWhen to go to bed or set your alarm so you wake at the end of a 90-minute sleep cycle.
- Running Pace CalculatorYour pace per km and per mile, speed, and finish times for a 5K, 10K, half and full marathon.
Date and time
Ages, date differences and working days, counted exactly.
- Age CalculatorYour exact age in years, months and days, total days lived, and the countdown to your next birthday.
- Date Difference CalculatorDays, weeks, months and working days between two dates.
- Hours and Time CalculatorHours worked between two times, with breaks and night shifts, in hours and minutes or decimal hours.
- Add Days to a DateThe date a number of days, weeks, months or years before or after any date, with the weekday.
- Time Zone ConverterWhat time it is in Pakistan, the Gulf, India, the UK, the US and more, with daylight saving applied.
- Day of the Week CalculatorThe weekday of any date, with its ISO week number, day of the year and leap-year check.
- Countdown CalculatorDays, weeks and weekdays until an event, or how long ago it was.
Conversion
Units people actually use, including marla, kanal and other local land measures.
- Marla, Kanal and Land Area ConverterConvert marla, kanal, square feet, square yards, square metres and acres, with both marla sizes used in Pakistan.
- Gold Tola to Gram ConverterConvert tola, masha, ratti, grams and troy ounces, and value your gold at today's rate.
- Unit ConverterLength, weight, volume, temperature and speed, including maund and cooking measures.
- Roman Numeral ConverterTurn numbers into Roman numerals and Roman numerals back into numbers, from 1 to 3,999.
- Binary, Hex and Decimal ConverterConvert numbers between decimal, binary, hexadecimal and octal, of any size.
Construction
Cement, bricks, paint and tiles for a build or renovation, using the sizes sold locally.
- Concrete CalculatorCement bags, sand and crush for a slab or footing, in feet or metres, for the common nominal mixes.
- Brick CalculatorHow many 9 × 4.5 × 3 inch bricks a wall needs, with mortar joints, openings and breakage.
- Paint CalculatorLitres and gallon tins of paint for a room's walls and ceiling, coat by coat.
- Tile CalculatorFloor tiles and boxes for a room in common sizes like 2 × 2 ft and 600 × 600 mm, with cutting waste.
Math
Percentages and everyday maths, with the working shown.
- Fraction CalculatorAdd, subtract, multiply and divide fractions, simplified, with mixed numbers and decimals.
- Average CalculatorMean, median, mode, range and standard deviation of any list of numbers.
- Percentage CalculatorFind X% of a number, what percent one number is of another, or the percentage change between two numbers.
- Ratio CalculatorSolve A : B = C : D, and simplify a ratio to whole numbers.
- Area CalculatorArea of a rectangle, circle, triangle, trapezoid, parallelogram or ellipse, in square metres and feet.
- Volume CalculatorVolume and litres held by a box, cylinder tank, sphere, cone or pyramid.
- Quadratic Equation CalculatorSolve ax² + bx + c = 0 with the discriminant, real or complex roots and the vertex.
- Exponent, Root and Log CalculatorPowers, square and cube roots, any n-th root, and logarithms in any base.
- Random Number GeneratorPick one or many random whole numbers in any range, with or without repeats, and share the draw.
- Speed, Distance and Time CalculatorFind travel time, average speed or distance from the other two, in km/h, mph or m/s.
- HCF and LCM CalculatorThe highest common factor (GCD) and least common multiple of two or more whole numbers.
- Prime Factorization CalculatorCheck whether a number is prime, and break it into prime factors with its number of divisors.
- Permutation and Combination CalculatornCr and nPr: how many ways to choose or arrange r items from n, with or without repeats.
- Rounding CalculatorRound to decimal places, significant figures or the nearest 10, 100 or 1,000, including banker's rounding.
- Scientific Notation ConverterWrite any number in scientific, E and engineering notation, or back out in full.
- Right Triangle CalculatorThe missing side by Pythagoras, plus both angles, the area and the perimeter.
Education
Marks, percentages and the grades you need, for students and parents.
- Marks Percentage CalculatorYour percentage from marks obtained and total marks, and how far you are from the pass mark.
- Final Exam Grade CalculatorThe score you need on the final exam to reach the overall grade you want.
- GPA CalculatorTerm GPA and new CGPA from your grades and credit hours on the 4.0 scale.
- CGPA to Percentage CalculatorConvert CGPA to a percentage with the CBSE, 4.0, 5.0 or 10-point formula, or your university's own.
Games
Formations, timers and resource planners for the games you play.