Calculators
Everyday calculators that answer as you type. Each one shows its formula and a worked example, so you can check the result yourself.
Math calculators
- Percentage Error CalculatorCalculate percentage error from measured and reference values. See signed error, absolute error and the formula, including negative reference values.
- Standard Deviation CalculatorCalculate sample or population standard deviation, variance, mean and count. Paste a numeric list, compare formulas and see worked examples in your browser.
- Ratio CalculatorSimplify a two-part ratio, solve a missing proportion or divide a total into shares. See the common factor and each part’s percentage in your browser.
- Running Pace CalculatorCalculate pace, finish time or distance in kilometres and miles. Compare pace per km and mile, speed and cumulative steady-pace splits in your browser.
- GPA CalculatorCalculate your semester GPA and cumulative CGPA from course grades and credit hours, on 5-point (KSU), Pakistan HEC 4.0 or US 4.0 scales. Free.
- CGPA to Percentage ConverterConvert CGPA to percentage with Pakistan's official HEC table (3.00 = 71%, not 75%), and see common formulas for 10, 4 and 5-point scales. Free.
- Percentage CalculatorWork out a percentage of a number, what percent one number is of another, or the whole from a part. Free, instant and private, right in your browser.
- Percentage Change CalculatorFind the percentage increase or decrease between two numbers, or add or subtract a percentage from a value. Free and instant, right in your browser.
- Average CalculatorFind the average (mean), median, mode, sum and range of a list of numbers. Paste a column from a spreadsheet; it's free, instant and private.
- Roman Numerals ConverterConvert numbers to Roman numerals and back (1 to 3,999), turn a date into Roman numerals for a tattoo or engraving, and see a 1–100 chart.
- Land Area ConverterConvert marla, kanal, bigha, katha, decimal, gaj, acre, hectare and square feet, with both Pakistani marla sizes and the bigha of each region.
- Random Number GeneratorPick one or many random numbers between any two whole numbers, with or without repeats. Truly random, from your device's secure generator.
- Fraction CalculatorAdd, subtract, multiply and divide fractions and mixed numbers, with the answer simplified, as a mixed number and as a decimal. Free.
- Grade CalculatorFind the score you need on your final exam to reach your target grade, or work out your current weighted grade from your marks so far.
Date & time calculators
- Time Card CalculatorAdd shift start and end times, subtract unpaid breaks and total your time card. See hours, minutes, optional basic gross pay and download a CSV.
- Age CalculatorCalculate your exact age in years, months and days from your date of birth, plus total weeks and days and the countdown to your next birthday.
- Days Between DatesCount the days between two dates, in days, weeks, and years, months and days. Choose whether to include the end date; free and instant in your browser.
- Hijri Date ConverterConvert dates between the Hijri (Islamic) and Gregorian calendars in both directions, and see today's Hijri date. Umm al-Qura calendar, free.
- Hours CalculatorCalculate the hours and minutes between two times, subtract a break, and get decimal hours for timesheets. Works for night shifts past midnight too.
- Working Days CalculatorCount working days between two dates, or find the date a number of business days away. Choose a Saturday–Sunday or Friday–Saturday weekend and add holidays.
- Time Zone ConverterConvert a date and time between time zones and countries, with daylight saving applied automatically. See the time difference, e.g. New York to India.
Finance calculators
- Investment Withdrawal CalculatorProject fixed monthly withdrawals with zero, positive or negative returns. See partial final payments, depletion month and a downloadable CSV schedule.
- Profit Margin CalculatorCalculate gross profit, profit margin and markup from cost and selling price. Compare the two percentages, handle losses and copy results in your currency.
- Break-Even CalculatorCalculate your break-even point from fixed costs, selling price and variable cost per unit. See contribution, whole units required and revenue at that quantity.
- Fuel Cost CalculatorEstimate trip fuel costs using miles or kilometres, US or imperial MPG, and litres per 100 km. Set your fuel price, round trip and shared cost per traveler.
- Savings Goal CalculatorCalculate how much to save or how long a goal may take. Set your starting balance, contribution frequency and assumed interest rate.
- Debt Payoff CalculatorCompare snowball and avalanche debt payoff plans using the same budget. See estimated interest, payoff dates and downloadable schedules.
- Mortgage Overpayment CalculatorCompare your mortgage with and without extra payments. Estimate interest and time saved using explicit rate and payment assumptions.
- Hourly to Salary CalculatorUse the hourly to salary calculator to convert hourly pay and annual gross salary. Edit hours and paid weeks, and compare monthly and weekly pay averages.
- Zakat CalculatorCalculate zakat at 2.5% on cash, gold, silver, business stock and money owed to you, less debts, with the nisab from today's gold or silver price. Free.
- EMI CalculatorCalculate the monthly EMI for a home, car or personal loan, with total interest and a year-by-year repayment table. Works for interest and profit rates.
- Compound Interest CalculatorSee how savings grow with compound interest, with optional monthly deposits and yearly, monthly or daily compounding. Includes a year-by-year growth table.
- SIP CalculatorEstimate what a monthly SIP or a lump sum could grow to, with a yearly step-up, the value in today's money after inflation, and a year-by-year table.
- FD CalculatorWork out the maturity amount and interest on a fixed deposit, compounded quarterly as banks do, or the monthly and quarterly payout on a non-cumulative FD.
- Simple Interest CalculatorCalculate simple interest and the total amount from the principal, a yearly rate and the time in years, months or days, with the formula and worked examples.
- Discount CalculatorWork out the sale price after a percentage discount, how much you save, and the real total when two discounts stack. Free and instant in your browser.
- Tip CalculatorWork out the tip and what each person pays, split the bill evenly and round up to a whole amount. Free, quick and works on any phone.
- VAT CalculatorAdd VAT to a price or work out the VAT included in it, at any rate, with presets for the UK, Ireland, UAE, Saudi Arabia, Egypt and Pakistan.
- GST CalculatorAdd GST to a price or remove it at the new 5%, 18% and 40% rates (and 3% for gold), with the CGST and SGST split or IGST. Free.
Health calculators
- Pregnancy Due Date CalculatorWork out your due date and how many weeks pregnant you are from the first day of your last period, adjusted for your cycle length. Free and private.
- Height ConverterConvert height from feet and inches to centimetres, or from cm to feet and inches, with a full height chart from 4 ft 10 in to 6 ft 6 in.
- Weight ConverterConvert body weight between kilograms, pounds and ounces, and stones and pounds, in every direction, with a chart of common weights. Free, instant.
- BMI CalculatorCalculate your body mass index (BMI) in metric or imperial units and see the WHO category, including the lower cut-offs WHO suggests for Asian populations.
- Calorie CalculatorEstimate how many calories you burn a day (BMR and TDEE) with the Mifflin–St Jeor formula, plus a rough target to lose or gain weight. For adults.
- Ideal Weight CalculatorFind the healthy weight range for your height based on WHO BMI ranges, with the Devine and Robinson formulas for comparison. Metric or imperial units.
How these calculators work
Every calculation runs on your own device: the numbers and dates you enter are never sent anywhere. Numbers can be typed with a dot or a comma as the decimal separator, and dates are counted in whole calendar days, so results don't change with your time zone.