Calculators and tools
58 free tools for money, work, school, home, travel, cooking, health and fun. They run in your browser: we do not ask for personal data or store what you type.
Personal finance
- Compound interest calculatorCompound interest calculator with monthly contributions: see how your money grows and how much comes from interest, year by year.
- Savings goal calculatorSavings goal calculator: how much you need to save per month, paycheck or week to reach a goal by a specific date.
- Budget calculatorMonthly budget calculator: organize income and expenses, see what is left over and compare it with the 50/30/20 rule.
- Emergency fund calculatorEmergency fund calculator: how much to set aside based on your essential expenses and how long it will take to save it.
- Debt payoff calculator (avalanche vs. snowball)Debt payoff calculator: compare the avalanche and snowball methods, your debt-free date and the interest you save.
- Simple interest calculatorSimple interest calculator: interest earned or paid, final amount and a comparison with compound interest, using I = P × r × t.
- U.S. inflation calculator (CPI 1913–2025)Inflation calculator using the U.S. consumer price index (CPI-U): compare the value of the dollar between 1913 and 2025.
Credit cards
Banking
Loans
Mortgages
Retirement & investing
Work & pay
- Hourly to salary calculatorConvert your hourly wage to weekly, biweekly, monthly and annual pay (and back), including overtime at 1.5x.
- Hours worked calculator (time card)Free time card calculator: add clock-in, clock-out and breaks for each day, weekly total, overtime and gross pay.
- Mexico aguinaldo (Christmas bonus) calculatorMexico aguinaldo calculator: at least 15 days of salary under Article 87 of the Federal Labor Law, prorated by days worked.
- Mexico severance calculator (finiquito and liquidación)Mexico severance calculator: unpaid wages, prorated aguinaldo and vacation, vacation premium, seniority premium and severance under the Federal Labor Law.
- Paycheck calculator 2026 (take-home pay)2026 paycheck calculator: estimate take-home pay after federal income tax, Social Security, Medicare, 401(k) and state tax.
Small business
- Profit margin and markup calculatorProfit margin and markup calculator: find profit, margin and selling price from cost, with the difference between margin and markup explained.
- CPC, CPM, CTR and ROAS calculatorDigital marketing metrics calculator: CTR, CPC, CPM, conversion rate, CPA, ROAS and ROI for your ad campaigns.
Math and school
- Percentage calculatorCalculate percentages instantly: what is X% of a number, what percent one number is of another, and percentage increase or decrease.
- Days between dates calculatorCount the days between two dates, business days, weeks and months, and add or subtract days from a date.
- Age calculatorCalculate exact age in years, months and days, total days lived and how long until the next birthday.
- Unit converterFree unit converter: pounds to kilograms, feet to meters, miles to kilometers, Fahrenheit to Celsius, gallons to liters and more.
- Average calculatorCalculate the average (mean), median, mode and weighted average of a list of numbers or grades.
- Random number generatorRandom number generator: pick a range and how many numbers, with or without repeats. Great for raffles, drawings and games. Free.
- Fraction calculatorFraction calculator with steps: add, subtract, multiply and divide fractions and mixed numbers, and simplify the result.
- Rule of three (proportion) calculatorRule of three calculator for direct and inverse proportions: solve for x step by step, with examples for recipes, prices and scaling.
- GPA calculatorGPA calculator: convert letter grades to the 4.0 scale weighted by credits and calculate your semester and cumulative GPA.
- Countdown timer to a dateLive countdown timer to any date: birthday, trip, wedding or New Year. Days, hours, minutes and seconds left.
- Final grade calculatorFind the score you need on your final exam to reach your target grade, based on your current grade and the weight of the final.
Text and security
- Word and character counterFree online word counter and character counter: count words, characters with and without spaces, sentences, paragraphs and reading time.
- Strong password generatorStrong random password generator: choose length, uppercase, numbers and symbols. Passwords are created in your browser and never sent.
- AI token and cost calculatorAI cost calculator: estimate tokens in a text and the cost per request and per month using your provider’s price per million tokens.
Shopping and sales tax
Home and energy
- Square footage calculatorSquare footage calculator: area of rectangles, circles and triangles in square feet and square meters for floors, rooms and materials.
- Paint calculatorPaint calculator: how many gallons or liters you need to paint a room based on walls, doors, windows and number of coats.
- Electricity cost calculatorElectricity cost calculator: how many kWh an appliance uses and what it costs per day, month and year at your electric rate.
- Rental property calculatorRental property investment calculator: gross yield, cap rate, net operating income, monthly cash flow and cash-on-cash return.
Travel, cars and time zones
- Tip calculatorCalculate the tip and split the bill between people, before or after tax, with rounding.
- Time zone converterTime zone converter: see the time difference between cities in the Americas, Europe and Asia, with daylight saving time included.
- Fuel cost calculator (gas trip cost)Fuel cost calculator: gas cost of a trip in miles or kilometers, per person, using MPG or liters per 100 km.
- Travel budget calculatorTravel budget calculator: transportation, lodging, food and activities, with a buffer for surprises, total per person and per day.
- Split expenses calculatorSplit costs from a trip, dinner or shared house: who paid what, each person’s share and who owes whom with the fewest transfers.
- Currency converter: dollar, peso, euro and moreCurrency converter with exchange rates updated once a day: U.S. dollar to Mexican peso, euro, pound and more than 150 currencies.
- Car depreciation calculatorEstimate what your car will be worth over time with an annual depreciation rate and a higher first-year rate. Year-by-year table.
Design and images
Fitness
Cooking
Health
Pets and garden
- Dog and cat age calculator in human yearsConvert your dog’s or cat’s age to human years with the approximate veterinary guideline: 15 the first year, 9 the second, then 4 to 5 per year.
- Soil, mulch and gravel calculatorCalculate how much soil, mulch or gravel you need for a garden bed or area: cubic feet, cubic yards, cubic meters, liters and bags.