CALCULATORS
Finance, math, date, and everyday calculators. Pick one below — every one of them runs right in your browser, nothing is uploaded.
Finance & Money
Discount Calculator
Find the final price and total savings from one or two stacked discounts.
Sales Tax Calculator
Add sales tax to a price, or extract it from a tax-included total.
Tip Calculator
Calculate a tip from a bill total and split it across any number of people.
Savings Goal Calculator
Find how long a savings goal takes, or the monthly deposit needed to hit it by a deadline, with compound interest.
Pay Raise Calculator
Find your new salary and raise percentage, with monthly, biweekly, and hourly pay.
Compound Interest Calculator
Project investment growth with compounding frequency and regular contributions.
APR Calculator
Calculate the true Annual Percentage Rate from your loan amount, interest rate, term, and upfront fees.
Investment Return Calculator
Calculate total return percentage, CAGR, and profit from an investment — from final value or annual return rate.
ROI Calculator
Calculate Return on Investment as a percentage from cost and profit, or initial and final values, with optional annualized ROI.
Loan Payment Calculator
Calculate monthly loan payments, total interest, and a payoff amortization summary.
Salary Calculator
Convert between hourly, daily, weekly, monthly, and annual pay.
Mortgage Calculator
Calculate a monthly mortgage payment, total interest, and payoff amount.
VAT Calculator
Add or remove VAT from a price at any rate, with the tax amount shown separately.
Tax Percentage Calculator
Find the tax rate from a total and the tax paid, or from pre-tax and post-tax amounts.
Markup Calculator
Calculate selling price, markup percentage, or cost from any two of the three.
Margin Calculator
Calculate gross profit margin, profit, or selling price from cost and revenue.
Break-Even Calculator
Find the break-even unit volume and revenue from fixed costs, price, and variable cost.
Mortgage Overpayment Calculator
See how much interest you save and how many years you cut from your mortgage by making regular monthly overpayments.
Interest Rate Calculator
Find the interest rate from a loan amount, payment, and term — or calculate the monthly payment from a rate.
Debt Payoff Calculator
Compare avalanche and snowball strategies across multiple debts and find your debt-free date.
Car Loan Calculator
Estimate your monthly auto loan payment from price, down payment, trade-in, tax, fees, APR, and term.
Rent vs. Buy Calculator
Compare home equity against invested savings over time, factoring in appreciation, rent increases, and returns.
Take-Home Pay Calculator
Estimate your net paycheck after federal tax, state tax, Social Security, and Medicare, by pay frequency.
SWIFT/BIC Checker
Validate a SWIFT/BIC code's structure and decode its bank code, country, location, and branch.
VAT Number Validator
Check a VAT number's format against its country's rules and see the country it decodes to.
Credit Card Interest Calculator
See how much interest a credit card balance will cost at a given APR and monthly payment, and how long it takes to pay off.
Math & Education
Percentage Calculator
Find X% of Y, what percent X is of Y, or the change between two numbers.
Ratio Calculator
Simplify a ratio to lowest terms, convert it to 1 : n and percentages, split a total, or scale it to a target value.
Rule of Three Calculator
Solve direct and inverse proportions: enter three values and find the fourth.
Average Calculator
Find the mean, median, mode, and range of a list, or an average per day, week, or month.
Fraction Calculator
Add, subtract, multiply, or divide fractions, with simplified and decimal results.
GPA Calculator
Calculate GPA from course grades and credit hours, on a 4.0 scale.
Quadratic Equation Solver
Solve ax² + bx + c = 0 for x, with real, repeated, or complex roots, plus the discriminant and vertex.
Grade Calculator
Add up every assignment's points to find your overall grade percentage and what it takes to hit a target grade.
Number to Words Converter
Convert any number into written-out English words, for checks, legal documents, and invoices.
Scientific Notation Calculator
Add, subtract, multiply, and divide in scientific notation and convert to engineering, E notation, or decimal.
Prime Number Checker & Generator
Check whether a number is prime, or generate every prime up to a limit or the first N primes.
GCF & LCM Calculator
Find the greatest common factor and least common multiple of two or more numbers, with prime factorizations shown.
Date & Time
Days Until Calculator
See how many days, weeks, and months until (or since) a date.
Leap Year Calculator
Check if a year is a leap year and why, plus the next five leap years.
Business Days Calculator
Count working days between two dates, or add/subtract business days from a date, with optional holidays to exclude.
Date Difference Calculator
Find the days, weeks, months, and years between two dates.
Time Calculator
Add or subtract hours and minutes from a clock time, or add and subtract durations.
Time Zone Converter
Convert a date and time between two time zones and see the UTC offset.
Zodiac Sign Calculator
Find your Western zodiac sign, date range, element, and traits from your birth month and day.
Day of Year Calculator
Find the day number (1-366) of any date, days left in the year, or convert a day number back to a date.
Week Number Calculator
Find the ISO 8601 week number for any date, plus the Monday-to-Sunday range it covers.
Birthday Countdown
Watch a live countdown in days, hours, minutes, and seconds to the next birthday.
Health & Fitness
BMI Calculator
Calculate Body Mass Index from height and weight, metric or imperial.
BMR Calculator
Calculate Basal Metabolic Rate and TDEE with the Mifflin-St Jeor formula.
Calorie Calculator
Find your daily calorie needs to maintain, lose, or gain weight, by age, sex, height, weight, and activity level.
Running Pace Calculator
Calculate running pace, finish time, or distance from any two of the three, with race-distance presets.
Water Intake Calculator
Estimate daily water intake from body weight, activity level, and climate, in liters, ounces, cups, and glasses.
Everyday & Unit Conversion
Fuel Cost Calculator
Estimate a trip's fuel cost from distance, fuel economy, and price per liter or gallon.
Unit Price Calculator
Compare price per unit across package sizes to find the better deal.
Currency Converter
Convert an amount between two currencies using an exchange rate you enter.
Aspect Ratio Calculator
Simplify a width/height to its lowest-terms ratio, or solve for a missing dimension from a known ratio like 16:9.
Shoe Size Converter
Convert shoe sizes between US Men's, US Women's, UK, EU, and centimeters, with a full reference chart.
Bandwidth Calculator
Estimate download/upload time, the speed you need, or monthly data transfer from file size and connection speed.
Questions
- Are these calculators actually free?
- Yes, all of them. No account, no daily limit, no premium tier — use as many calculators as you need, as often as you need.
- Is my financial or personal data uploaded to a server?
- No. Every calculator here runs entirely in your browser — nothing you type is ever transmitted or stored.
- Which calculator should I use for loans or interest?
- Loan Payment Calculator gives you the monthly payment and total interest on a fixed-rate loan; Compound Interest Calculator projects savings growth with regular contributions.
- Do you have date and time calculators too?
- Yes — Age Calculator, Date Difference Calculator, Days Until Calculator, Leap Year Calculator, and Time Calculator all live in this category alongside the finance and math tools.