Calculators
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Age Calculator
Free age calculator: enter your birth date to see your exact age in years, months, days, hours and minutes, plus the countdown to your next birthday.
Business Days Calculator
Free business days calculator: count the working days between two dates, weekends excluded - useful for deadlines, delivery dates and project planning.
Add Days to Date
Start from any date and move forwards or backwards by days, weeks, months or years - with a business-day mode that skips weekends.
Date Difference Calculator
Free date difference calculator: find the exact time between two dates in years, months, days and weeks, and see how many working days fall in between.
Day of the Week Calculator
Free day of the week calculator: find out which weekday any date falls on - past or future - handy for birthdays, events and historical dates.
Hours Worked
Add start and end times for each day, subtract breaks, and get the week in hours and minutes, in decimal, and in money. Night shifts too.
Leap Year Checker
Free leap year checker: see whether any year has 366 days, why the rule works the way it does, and which leap years come next.
Pregnancy Calculator
Free pregnancy calculator: work out your due date, current week and trimester from your last menstrual period, with the estimated conception date.
Time Difference Calculator
Free time zone calculator: check the current time difference between any two cities worldwide, with daylight saving time already taken into account.
Week Number Calculator
Free ISO 8601 week number calculator: find which week of the year any date falls in, and see the first and last day of that week at a glance.
Home Affordability
Work backwards from your income to a price. Enter what you earn, what you owe and what you have saved, and see the house that fits.
Break-Even Calculator
Free break-even calculator: find how many units you must sell to cover costs, with break-even revenue, contribution margin and profit at any volume.
Card Payoff
See how long a card balance takes to clear and what the interest costs. Pay a fixed amount, or the minimum, and watch the difference.
Compound Interest Calculator
Free compound interest calculator: see the final balance, total interest earned and year-by-year growth for any compounding frequency and regular deposits.
Debt Payoff Calculator
List your debts with balance, rate and minimum payment, add what extra you can pay, and see when you will be debt-free with the avalanche or snowball method — plus the interest and months you save compared with paying only the minimums.
Discount Calculator
Free discount calculator: enter the original price and discount to see the sale price, how much you save and the effective percentage off.
Electricity Cost
Enter watts, hours a day and your tariff to see what an appliance costs per day, month and year. Standby hours are counted separately, because they add up.
Fuel Cost
Work out what a drive costs in fuel, in L/100km, km/L or mpg, and split it between passengers. Handles round trips and both US and UK gallons.
Inflation Calculator
Enter an amount, a rate and a number of years to see two things at once: what the same thing will cost, and what that money will be worth.
Margin Calculator
Enter any two of cost, price, margin and markup — the other two appear. Margin and markup are shown side by side, because they are not the same number.
Percentage Calculator
Work out a percentage of a number, what share one number is of another, the change between two values, and adding or removing a percentage.
Retirement Calculator
Project your savings to retirement month by month, see how long they last against the income you want, and find the monthly amount that closes the gap. Inflation, yearly step-ups and a 4% rule check included.
ROI Calculator
Free ROI calculator: enter the amount invested and returned to see your ROI percentage, net profit, annualised return and payback period.
Salary Raise Calculator
Free salary raise calculator: enter your current pay and the raise percentage to see your new salary, the increase amount and the yearly difference.
Salary Calculator
Turn any pay figure into all the others: hourly, daily, weekly, fortnightly, monthly and annual. Set your own hours and working weeks.
Savings Goal
Set a target and ask it either way: how much to put aside each month to get there by a date, or how many months a chosen amount will take. Interest included.
SIP Calculator
See how a fixed monthly investment grows over the years with compound returns. Add a lump sum, an annual step-up and the contribution timing, and read the year-by-year table and chart.
Tip Calculator
Work out the tip, the total and what each person owes. Rounding up adjusts the tip rather than the total, which is what actually happens at the table.
Unit Price Calculator
Compare two or more products by price per kilogram, litre or piece. Enter price, quantity and unit for each — grams, ounces, millilitres, fluid ounces, multipacks — and see which is cheapest and by how much.
VAT Calculator
Work out the tax on a price at any rate, in either direction: add VAT to a net figure or pull it back out of a gross one.
Loan Calculators
Loan Calculator
Free loan calculator for monthly payment, total interest and total cost. Works for personal, auto and other fixed-rate loans, with a full amortization table.
Mortgage Calculator
Free mortgage calculator: estimate your monthly payment including principal, interest, property tax, home insurance and PMI, with the full schedule.
Partially Amortized Loan Calculator
Free balloon loan calculator: enter amount, rate, amortisation term and actual term to see the monthly payment, balloon balance and total cost.
BMI Calculator
Free BMI calculator: enter your height and weight to see your body mass index and which WHO category it falls into, in metric or imperial units.
Body Fat Calculator
Free body fat calculator: estimate your body fat percentage with the U.S. Navy tape method and see which fitness category your result falls into.
Calories Burned Calculator
Estimate the calories you burn running, cycling, swimming, lifting, walking and 25 more activities from your weight and the minutes you spend, using MET values from the Compendium of Physical Activities.
Calorie Calculator
Free calorie calculator: estimate your daily calorie needs with the Mifflin-St Jeor formula, based on age, weight, height and activity level.
Fitness Goal Timeline Calculator
Free fitness goal calculator: see how many weeks it will take to reach your target weight from your current stats and weekly effort.
Ideal Weight Calculator
Free ideal weight calculator: see your healthy weight range from height, age and gender using the Hamwi, Devine and Robinson formulas side by side.
Macro Calculator
Split a daily calorie target into grams of protein, carbohydrate and fat. Pick a preset or set your own percentages and watch them balance.
Ovulation Calculator
Enter the first day of your last period and your usual cycle length to see the likely fertile window, ovulation day and next period date.
Pace Calculator
Fill in any two of pace, time and distance and the third appears, along with the split times you need to hold on race day.
Sleep Calculator
Say when you must get up, or when you are going to bed, and see the times that land at the end of a sleep cycle rather than the middle.
Target Heart Rate Calculator
Free target heart rate calculator: find your fat-burn, cardio and peak zones from age and resting pulse using the Karvonen formula.
Water Intake Calculator
Free water intake calculator: work out how much you should drink each day from your weight, activity level and climate, in litres or ounces.
Waist-to-Hip Ratio Calculator
Free waist-to-hip ratio calculator: enter your waist and hip measurements to see your ratio and the health risk band defined by WHO guidelines.
Area Calculator
Work out the area and perimeter of eight common shapes. Pick the shape, fill in the measurements it needs, and the answer updates as you type.
Fraction Calculator
Add, subtract, multiply or divide two fractions. The answer is simplified and also shown as a mixed number and a decimal, so you can use the form you need.
GCF and LCM
Find the greatest common factor and lowest common multiple of two or more whole numbers, with the prime factorisation of each one shown alongside.
Matrix Calculator
Enter two matrices up to four by four and get the sum, product, transpose, determinant or inverse, with the size rules checked for you.
Ohm's Law
Enter any two of voltage, current, resistance and power, and the other two are worked out for you. Every pairing is supported, not just volts and amps.
Paint Calculator
Enter the room size, doors, windows and number of coats to find the litres or gallons of paint and the cans to buy. Works in metres with m²/L or feet with ft²/gal, with an allowance for touch-ups.
Permutations & Combinations
Count how many ways r items can be chosen from n, with and without order mattering, and with or without repetition allowed.
Quadratic Solver
Enter a, b and c to solve ax² + bx + c = 0. You get the roots, the discriminant that decides how many there are, and the vertex of the parabola.
Ratio Calculator
Reduce a ratio to its simplest whole numbers, or fill in three of the four values and let the fourth one be worked out for you.
Scientific Calculator
A scientific calculator with trigonometry, logarithms, powers, roots and factorials. Type an expression or use the keypad; degrees and radians both supported.
Scientific Notation
Convert between ordinary decimals and scientific notation in either direction, with engineering notation and a significant figures count alongside.
Standard Deviation
Paste a list of numbers and get the standard deviation, variance, mean, median, mode and range at once - both the sample and the population version.
Significant Figures
Count the significant figures in a number, round it to as many as you need, and apply the right rule when two measurements are combined.
Slope Calculator
Give two points and get the slope between them, the equation of the line, the angle it makes, the distance and the midpoint - all at once.
Triangle Calculator
Solve a right triangle from any two sides, or a general triangle from all three. You get the missing side, all three angles, the area and a drawing to scale.
Volume Calculator
Pick a shape, enter its measurements, and get the volume and surface area at once - with the answer in litres alongside.
Abitur Calculator
Calculate your German Abitur final grade from the Block I course points and the five examination results, using the KMK formula: total points out of 900 and the grade from 1.0 to 4.0. Runs in your browser.
ACT Score Calculator
Estimate your ACT section scores and composite from correct answers on the shortened ACT, see the national percentile and SAT equivalent, and work out your superscore across test dates. Science is optional. Runs in your browser.
AGS Score Calculator
Estimate your MEB-AGS P1 and P2 scores for the National Education Academy from correct and wrong answers in the six AGS sub-tests and the ÖABT field test, with ÖSYM's standard-score model and 100-point formula. Runs in your browser.
ALES Score Calculator
Estimate your ALES numerical, verbal and equal-weight scores from correct and wrong answers with the standard-score model ÖSYM uses, with editable exam statistics. Runs in your browser.
Bac Calculator
Calculate your French baccalauréat général average from continuous assessment and final exam grades with the official coefficients, and see the mention and whether you pass, go to the oral make-up or fail. Runs in your browser.
SSC HSC GPA Calculator
Convert your Bangladesh SSC or HSC marks into letter grades and grade points and calculate the GPA out of 5, with the optional fourth subject counted only above 2 points. Runs in your browser.
DGS Score Calculator
Estimate your DGS numerical, verbal and equal-weight scores from correct and wrong answers and your associate-degree GPA, using ÖSYM's standard scores, the Table-A coefficients and the ÖBP rules. Runs in your browser.
EBAU Calculator
Calculate your Spanish university entrance score: the nota de acceso from the bachillerato average and the general phase, and the nota de admisión up to 14 with the two best weighted specific subjects. Runs in your browser.
GMAT Score Calculator
Estimate your GMAT Focus Edition total from the Quantitative, Verbal and Data Insights section scores and see the percentile for each section and the total. Runs in your browser.
GPA Calculator
Work out your GPA on the 4.0 scale from letter grades and credits, and find out what you need on the final exam to reach your target grade. Add as many courses as you like.
GRE Score Calculator
Estimate your GRE Verbal and Quantitative scores from correct answers on the shortened GRE, add your Analytical Writing score, and see the total and ETS percentiles. Runs in your browser.
HMGS Score Calculator
Calculate your HMGS or İYÖS score from the number of correct answers: 120 questions, no penalty for wrong answers, 100-point scale and the 70-point pass mark, with the subject distribution of the exam. Runs in your browser.
IELTS Band Calculator
Work out your IELTS overall band from the four skill bands with the official rounding rule, convert Listening and Reading raw scores to bands for Academic or General Training, and see which band you need in one skill to reach a target. Runs in your browser.
JEE NEET Marks Calculator
Calculate your JEE Main marks out of 300 or NEET marks out of 720 from correct and wrong answers with the +4 and −1 marking scheme, plus attempts, accuracy and unattempted questions. Runs in your browser.
KPSS Score Calculator
Estimate your KPSS general ability and general culture scores for bachelor's, associate and high-school levels from correct and wrong answers, using the standard-score model ÖSYM applies, with editable exam statistics. Runs in your browser.
Kyotsu Test Calculator
Add up your Common Test for University Admissions scores, see the score rate and convert them to a target university's allocation (keisha haiten) per subject. Runs in your browser.
LGS Score Calculator
Estimate your LGS central exam score from correct and wrong answers in the six tests, with the three-wrong-cancel-one rule and the weighted standard-score model MEB uses. Runs in your browser.
LSAT Score Calculator
Estimate your LSAT scaled score from 120 to 180 from the number of correct answers, see the likely range and percentile, and find how many correct answers a target score needs. Runs in your browser.
Maturità Calculator
Calculate your Italian maturità final mark from school credits, the two written tests, the oral and the commission bonus, see whether you pass and whether the lode is possible, and find your credit band from your grade averages. Runs in your browser.
MCAT Score Calculator
Estimate your MCAT section scores from correct answers on a practice test, add them to a total from 472 to 528 and see the AAMC percentile, or enter scaled section scores directly. Runs in your browser.
MSÜ Score Calculator
Estimate your MSÜ numerical, equal-weight, verbal and general scores from correct and wrong answers in Turkish, social sciences, mathematics and science, with the official test weights on the 100 to 500 scale. Runs in your browser.
SAT Score Calculator
Estimate your digital SAT score from the number of correct answers in Reading and Writing and Math, see the likely range and national percentile, compare with a target, and work out your superscore across attempts. Runs in your browser.
ENEM SISU Calculator
Turn your five ENEM scores into the simple average and the weighted average a SISU course uses, with the course's weights and any affirmative-action or regional bonus. Runs in your browser.
Suneung Score Calculator
Estimate your CSAT (Suneung) standard scores, percentiles and grades from raw scores in Korean, mathematics and the inquiry subjects with editable exam statistics, and read the absolute grades for English and Korean history. Runs in your browser.
THPT Score Calculator
Calculate your Vietnamese THPT admission score from three subjects with area and group priority points under the tapering rule, and your graduation score from exam results and school grades. Runs in your browser.
TOEFL Score Calculator
Add up your TOEFL iBT section scores to a total out of 120 with the CEFR level per section, or estimate the sections from correct answers and task ratings. Runs in your browser.
TUS DUS EUS Calculator
Estimate your TUS, DUS or EUS specialisation exam score from correct and wrong answers: standard scores, the weighted K and T scores and the 45-point placement threshold, with editable exam statistics. Runs in your browser.
UCAS Points Calculator
Convert your A level, AS level, EPQ and BTEC grades into UCAS Tariff points and add them up to compare with university entry requirements. Uses the official UCAS Tariff tables. Runs in your browser.
Midterm Final Calculator
Calculate your course average from midterm and final scores with their weights, see whether you pass and find the final score you need to reach the passing average, with an optional minimum final score. Runs in your browser.
YDS / YÖKDİL Score Calculator
Calculate your YDS, e-YDS or YÖKDİL score from correct answers (1.25 points each, no penalty), see the letter grade, check master's, doctorate and associate professorship thresholds, and find how many correct answers a target needs. Runs in your browser.
YDS Equivalency
Convert TOEFL iBT, PTE Academic, Cambridge, Oxford, TestDaF, telc, Goethe, DELF/DALF, CELI, DELE and TORFL results into their ÖSYM YDS equivalents using the official equivalency tables. Runs in your browser.
YKS Score Calculator
Estimate your YKS score from correct and wrong answers: TYT, AYT (SAY, EA, SÖZ) and YDT (DİL) nets with four wrong cancelling one correct, the high-school OBP contribution and the placement score. Runs in your browser.
YÖK GPA Conversion
Convert a 4.00-scale GPA to its 100-point equivalent with the official YÖK conversion table used by Turkish universities and public institutions, and estimate the 4-point value of a 100-point grade. Runs in your browser.
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Calculators