All Calculators
Browse all 60 free calculators across 4 categories. Every tool runs in your browser with instant results — no account needed.
Finance Calculators
17 calculators
Mortgage Calculator
Calculate your monthly mortgage payments, total interest, and total cost of your home loan.
Compound Interest Calculator
Calculate how your savings or investments grow over time with compound interest.
Loan Calculator
Calculate monthly loan repayments, total interest, and total cost for personal loans, car finance, and more.
Salary Calculator
Convert your salary between yearly, monthly, weekly, daily, and hourly rates. See your take-home pay after tax.
VAT Calculator
Add or remove VAT from any amount. Supports UK standard rate (20%), reduced rate (5%), and custom rates.
Savings Calculator
Calculate how your savings will grow over time with regular deposits and compound interest.
Investment Return Calculator
Calculate the future value of your investments based on initial investment, regular contributions, and expected rate of return.
Hourly to Salary Calculator
Convert an hourly wage to an annual salary, or an annual salary to an hourly rate. Factor in hours per week and weeks per year.
Budget Calculator
Use the 50/30/20 budget rule to allocate your after-tax income to needs, wants, and savings.
Retirement Calculator
Project how much your retirement savings will grow and estimate whether you are on track to meet your retirement income goal.
Credit Card Payoff Calculator
Calculate how long it will take to pay off your credit card balance and how much total interest you will pay.
Simple Interest Calculator
Calculate simple interest on a principal amount using the formula I = P × r × t. Find total interest earned or owed.
Inflation Calculator
Calculate how inflation affects the purchasing power of your money over time. See what today's money will be worth in the future.
Net Worth Calculator
Calculate your total net worth by adding up all your assets and subtracting all your liabilities. Track your financial health over time.
Effective Tax Rate Calculator
Calculate your effective tax rate by dividing total tax paid by your gross income. Compare your actual tax burden to marginal tax brackets.
Stamp Duty Calculator
Calculate stamp duty land tax (SDLT) for property purchases in England. Supports standard buyers, first-time buyers, and additional property purchases.
Take-Home Pay Calculator
Calculate your exact UK take-home pay after income tax, National Insurance, pension contributions, and student loan repayments. Based on 2025/26 rates.
Health Calculators
14 calculators
BMI Calculator
Calculate your Body Mass Index (BMI) to check whether you are at a healthy weight for your height.
Calorie Calculator
Estimate your daily calorie needs based on age, height, weight, and activity level.
Ideal Weight Calculator
Find your ideal weight range based on height and gender using multiple established formulas.
Pregnancy Due Date Calculator
Calculate your estimated due date and see key pregnancy milestones based on your last menstrual period.
Body Fat Calculator
Estimate your body fat percentage using the US Navy method based on body measurements.
Macro Calculator
Calculate your optimal daily macronutrient intake — protein, carbohydrates, and fat — based on your goals.
Water Intake Calculator
Calculate your recommended daily water intake based on your body weight, activity level, and climate.
Heart Rate Zone Calculator
Calculate your target heart rate training zones using the Karvonen formula for more effective workouts.
Sleep Calculator
Calculate the best times to fall asleep or wake up based on 90-minute sleep cycles for more refreshing rest.
BAC Calculator
Estimate your blood alcohol content (BAC) based on drinks consumed, body weight, gender, and time elapsed.
Ovulation Calculator
Estimate your ovulation date and fertile window based on your menstrual cycle length and last period date.
Calories Burned Calculator
Calculate calories burned during exercise and daily activities using MET (Metabolic Equivalent of Task) values.
TDEE Calculator
Calculate your Total Daily Energy Expenditure — the calories you burn each day based on your height, weight, age, sex, and activity level.
Period Calculator
Predict your next three periods, fertile window, and ovulation date based on your cycle length.
Maths & Conversion Calculators
15 calculators
Percentage Calculator
Calculate percentages easily — find what percent of a number is, percentage change, and more.
Fraction Calculator
Add, subtract, multiply, and divide fractions. Simplifies results to the lowest terms automatically.
Area Calculator
Calculate the area of common shapes — rectangle, circle, triangle, trapezium, and more.
Average Calculator
Calculate the mean, median, mode, and range from any set of numbers. Enter your data and get all four measures of central tendency instantly.
Ratio Calculator
Solve proportions and find the missing value in A:B = C:D. Simplify ratios, scale recipes, convert map distances, and work with any proportional relationship.
Quadratic Equation Solver
Solve any quadratic equation ax² + bx + c = 0. Get both roots, the discriminant, vertex coordinates, and axis of symmetry with full working shown.
Exponent Calculator
Calculate any power or root. Enter a base and exponent to compute bⁿ, including negative exponents, fractional exponents (roots), and zero power.
LCM & HCF Calculator
Find the Least Common Multiple (LCM) and Highest Common Factor (HCF/GCD) of two or more numbers. Uses prime factorisation and the Euclidean algorithm with step-by-step working.
Roman Numeral Converter
Convert between Roman numerals and standard (Arabic) numbers. Enter a Roman numeral like XIV or a number like 2024 and get the conversion instantly with the breakdown explained.
Scientific Notation Converter
Convert between standard notation and scientific notation. Enter any number and get it expressed as a × 10ⁿ, or enter scientific notation to see the full number.
Prime Number Calculator
Check if a number is prime, find its complete prime factorisation, and list all prime numbers up to a given limit. Uses trial division and the Sieve of Eratosthenes.
Scientific Calculator
Free online scientific calculator with trigonometry, logarithms, exponents, factorials, and constants.
Mean, Median & Mode Calculator
Calculate the mean, median, mode, range, sum, and count from any list of numbers.
Standard Deviation Calculator
Calculate the standard deviation, variance, and mean from any list of numbers. Shows both population and sample standard deviation.
Fraction to Decimal Calculator
Convert fractions to decimals and decimals to fractions instantly. Shows simplified fractions, percentages, and whether the decimal terminates or recurs.
Everyday Calculators
14 calculators
Age Calculator
Calculate your exact age in years, months, and days. Find the time between any two dates.
Date Calculator
Add or subtract days, weeks, or months from any date. Find the difference between two dates.
Tip Calculator
Calculate the tip amount and total bill. Split the bill evenly between any number of people.
Discount Calculator
Calculate the sale price after a percentage discount. See how much you save on any purchase.
Unit Converter
Convert length, weight, temperature, volume, and speed between common metric and imperial units instantly.
Fuel Cost Calculator
Calculate the fuel needed and total cost for any journey based on distance, fuel efficiency, and price per litre or gallon.
Reading Time Calculator
Estimate how long it takes to read or speak any text based on word count and average reading or speaking speed.
Grade Calculator
Calculate your weighted average grade across multiple assignments, convert to letter grade and GPA on a 4.0 scale.
Pace Calculator
Calculate your running or walking pace, speed, and projected finish times for any distance including 5K, 10K, half marathon, and marathon.
Time Calculator
Add or subtract hours, minutes, and seconds, or find the exact duration between two times of day.
GPA Calculator
Calculate your semester and cumulative GPA on a 4.0 scale by entering courses, grades, and credit hours.
Paint Calculator
Calculate how much paint you need for a room based on wall dimensions, number of coats, and standard tin sizes (1L, 2.5L, 5L).
Random Number Generator
Generate one or multiple random numbers between any minimum and maximum value. Supports integers, decimals, and unique number sets.
Word Counter
Count words, characters, sentences, and paragraphs in any text. Shows reading time and speaking time instantly.