Math & Calculators
Free online calculators for everyday math, finance, unit conversion, and more.
- VAT Calculator — Tool for calculating VAT amounts and prices with and without tax, perfect for business owners, accountants, and freelancers who need quick VAT calculations for invoices, pricing, and financial reporting.
- Profit Margin Calculator — A smart and accurate tool for calculating gross, net, and operating profit margins instantly, perfect for business owners, entrepreneurs, and finance professionals who need to quickly assess the profitability of any product, service, or business.
- Mortgage Calculator — Calculating monthly mortgage payments, total interest, and full repayment costs based on loan amount, interest rate, and term perfect for homebuyers and property investors planning their finances. Free online mortgage calculator, no signup required.
- Business Days Calculator — Practical tool for calculating the number of working days between two dates, perfect for project managers, freelancers, and business professionals who need accurate deadline and delivery time estimates.
- Hourly to Salary — simple and accurate tool for converting hourly wages to annual salary and vice versa, perfect for job seekers, freelancers, and employers who need to quickly compare compensation packages. Free salary calculator, no signup or installation needed.
- Statistics Calculator — Comprehensive tool for calculating essential statistical values including mean, median, mode, standard deviation, and variance perfect for students, researchers, and data analysts. Free online statistics calculator, no signup or installation needed.
- Roman Numeral Converter — Convert numbers to Roman numerals and Roman numerals to numbers. Free online Roman numeral converter with instant results, no account needed.
- Scientific Calculator — Fully functional scientific calculator for performing advanced mathematical operations including trigonometry, logarithms, exponents, and more right in your browser with no installation needed.
- Fuel Cost Calculator — Practical tool for estimating fuel costs for any trip based on distance, fuel consumption, and current fuel prices perfect for road trip planning and everyday driving budgeting. Free online fuel cost calculator, works in your browser with no signup.
- Compound Interest Calculator — Smart and intuitive tool for calculating compound interest over time, perfect for visualizing investment growth, savings projections, and long-term financial planning.
- Percentage Calculator — Calculate percentages, percentage change, and percentage of total. Free online percentage calculator, works instantly in your browser with no signup required.
- Age Calculator — Calculate exact age in years, months, and days from a birthdate. Free online age calculator, works instantly in your browser with no account or installation needed.
- Date Difference — Calculate the number of days, weeks, months between two dates. Free online date difference calculator, works in your browser with no signup required.
- Unit Converter — Convert length, weight, temperature, area, volume, and speed units. Free online unit converter with instant results, no account or installation needed.
- Loan Calculator — Calculate monthly payments, total interest, and amortization schedule. Free online loan calculator, works in your browser with no signup or installation required.
- Tip Calculator — Calculate tip amount and split the bill between multiple people. Free online tip calculator and bill splitter, works instantly in your browser.
- Discount Calculator — Calculate discounted price and savings from a percentage off. Free online discount calculator, works in your browser with no account or installation needed.
- Number Base Converter — Convert numbers between binary, octal, decimal, and hexadecimal. Free online number base converter, works instantly in your browser with no signup required.
- Random Number Generator — Generate random numbers with custom range, count, and decimal options. Free online random number generator, works in your browser with no account needed.
- Invoice Generator — Create professional invoices with line items, tax calculation, and totals. Free online invoice generator, works in your browser and lets you download a PDF with no account required.
- GPA Calculator — Calculate your cumulative GPA from letter grades and credit hours. Free online GPA calculator using the standard 4.0 scale, works instantly in your browser with no signup required.
- Grade Calculator — Calculate your final weighted grade from assignment categories with different percentage weights. Free online grade calculator, instant results in your browser, no signup needed.
- Pregnancy Due Date Calculator — Estimate your pregnancy due date from your last menstrual period and cycle length. Free online due date calculator using Naegele's rule, with trimester breakdown and key milestone dates.
- Ovulation Calculator — Predict your ovulation date and fertile window from your last period and cycle length. Free online ovulation calculator with 3-cycle forecast, works instantly in your browser.
- Sleep Cycle Calculator — Find the best time to wake up or go to bed based on 90-minute sleep cycles. Free online sleep calculator that helps you wake up feeling rested, no signup needed.
- Pace Calculator — Convert running pace between min/km and min/mile, calculate speed, and find your finish time for any race distance. Free, works in your browser.
- Concrete Calculator — Calculate how much concrete you need in cubic metres, cubic yards, and number of bags. Shows metric and imperial results together. Free, no signup.
- Paint Calculator — Calculate how much paint you need for a room. Enter dimensions, number of doors and windows, and coats. Shows litres and gallons. Free, no signup.
- Tile Calculator — Calculate how many tiles you need for any floor or wall. Enter area size, tile size, and waste percentage. Shows metric and imperial results. Free, no signup.
- BTU Calculator — Calculate the BTU and kW needed to cool or heat a room. Enter room area, ceiling height, sunlight, and occupants. Free online HVAC size calculator.
- Wind Chill Calculator — Calculate the wind chill temperature based on air temperature and wind speed. Shows feels-like temperature in °C and °F with danger level. Free, no signup.
- Dew Point Calculator — Calculate the dew point temperature from air temperature and relative humidity. Shows result in °C and °F with humidity comfort level. Free, no signup.
- Standard Deviation Calculator — Calculate population and sample standard deviation, variance, and mean from a list of numbers. Shows a deviation table. Free online std dev calculator.
- Quadratic Equation Solver — Solve quadratic equations ax² + bx + c = 0. Shows discriminant, real or complex roots, vertex, and step-by-step formula. Free, no signup.
- Matrix Calculator — Add, subtract, multiply matrices, find determinant, inverse, and transpose. Supports dynamic sizes from 2x2 up to 6x6. Free online matrix calculator.