65+ free calculators for finance, health, math, and everyday life — mortgage, BMI, TDEE, loan repayment, tax brackets, compound interest, GPA, pregnancy due date, and more. No sign-up, instant results.
See how your money grows over time with compound interest. Get a full year-by-year breakdown.
Open ToolDetermine if your AI tool subscription is worth it by calculating ROI based on time saved.
Open ToolFind out how many years it takes for solar panels to pay for themselves and estimate lifetime savings.
Open Tool🍽️ Tip Calculator
Calculate tip amount and split bills between people instantly.
💵 Hourly to Salary Calculator
Convert any hourly wage to annual, monthly, weekly, and daily pay instantly.
⏰ Overtime Calculator
Calculate overtime pay for any number of extra hours worked above your standard 40-hour week.
🐷 Savings Goal Calculator
Find out how much to save each month to reach your financial goal by a target date.
📈 Compound Interest Calculator
See how your money grows over time with compound interest. Get a full year-by-year breakdown.
🤖 AI Tool ROI Calculator
Determine if your AI tool subscription is worth it by calculating ROI based on time saved.
☀️ Solar Panel Break-Even Calculator
Find out how many years it takes for solar panels to pay for themselves and estimate lifetime savings.
⚡ EV Cost Savings Calculator
Compare the total cost of owning an electric vehicle vs a gas car. See fuel savings and break-even timeline.
🏠 Mortgage Calculator
Calculate your monthly mortgage payment, total interest paid, and full repayment cost for any home loan.
💼 Freelancer Rate Calculator
Calculate the hourly rate you need to charge as a freelancer to meet your income goals and cover expenses.
💰 Net Worth Calculator
Calculate your net worth by subtracting your total liabilities from your total assets.
📈 Inflation Calculator
See how inflation erodes purchasing power over time and calculate the future value of today's money.
📱 Subscription Cost Calculator
Add up all your monthly subscriptions and see the true annual cost of your digital spending.
🏠 Rent Affordability Calculator
Find out if your rent is eating too much of your income using the 30% rule and see your ideal rent range.
🏡 Rent vs Buy Calculator
Compare the true long-term cost of renting vs buying a home, including opportunity cost of the down payment.
🧾 Tax Bracket Calculator
See exactly which tax brackets your income falls into and calculate your effective tax rate for US or UK.
💱 Currency Converter
Convert between 15 major currencies with approximate exchange rates. See instant conversions and popular currency pairs.
💳 Loan Repayment Calculator
Calculate your monthly loan repayment, total interest, and full repayment schedule for any personal or car loan.
💧 Water Intake Calculator
Calculate your recommended daily water intake based on weight, activity level, and climate.
🏋️ One Rep Max Calculator
Estimate your one-rep max (1RM) for any lift using the Epley, Brzycki, or Lombardi formula.
🎯 Ideal Weight Calculator
Calculate your ideal body weight range using the Hamwi, Devine, and Miller formulas based on height and sex.
🔥 TDEE Calculator
Calculate your Total Daily Energy Expenditure and BMR. Get calorie targets for weight loss or gain.
⚖️ BMI Calculator
Calculate your Body Mass Index with metric or imperial units. See your BMI category and scale visualization.
🥗 Macro Calculator
Calculate your daily calories, protein, carbs, and fat targets based on your body stats, activity level, and goal.
📏 Body Fat Calculator
Estimate your body fat percentage using the US Navy tape method. Enter height, neck, and waist measurements for an instant result.
😴 Sleep Cycle Calculator
Find the best times to wake up or go to bed based on 90-minute sleep cycles. Wake up refreshed, not groggy.
🏃 Running Pace Calculator
Calculate your running pace, finish time, or distance. See projected race finish times for 5K, 10K, half marathon, and marathon.
🔥 Calories Burned Calculator
Calculate how many calories you burn during any activity using MET values, body weight, and duration.
🍺 Blood Alcohol Content (BAC) Calculator
Estimate your Blood Alcohol Content (BAC) using the Widmark formula. See if you are over the legal driving limit.
👶 Pregnancy Due Date Calculator
Calculate your pregnancy due date from your last menstrual period or IVF transfer date. See current week, trimester, and key milestones.
⏱️ Reading Time Estimator
Estimate how long it takes to read or speak any number of words at different speeds.
📝 Word Counter
Count words, characters, sentences, and paragraphs instantly. Get reading and speaking time estimates.
🔤 Case Converter
Convert text between UPPER CASE, lower case, Title Case, Sentence case, camelCase, and snake_case.
📄 Lorem Ipsum Generator
Generate lorem ipsum placeholder text by paragraphs, sentences, or words. Free online dummy text generator.
🔢 Character Counter
Count characters, words, and lines in your text. Check Twitter, SMS, and meta description character limits instantly.
🔁 Text Repeater
Repeat any text a set number of times with your choice of separator. Free online text multiplier tool.
🔀 Reverse Text Generator
Reverse text character by character or word by word. Free online backwards text and mirror text generator.
🔗 URL Slug Generator
Convert any text into a clean URL slug for SEO-friendly web addresses. Free slug generator tool.
🔍 Keyword Density Checker
Calculate keyword density in any text. Check keyword frequency and percentage for SEO content optimisation.
√ Square Root Calculator
Calculate the square root, cube root, or any nth root of a number instantly.
🔢 Exponent Calculator
Calculate any base raised to any power (exponent). Supports decimal and negative exponents.
❕ Factorial Calculator
Calculate the factorial of any whole number from 0 to 12 instantly.
📊 Percentage Change Calculator
Calculate the percentage change between two numbers. Find increase or decrease as a percentage instantly.
% Percentage Calculator
Calculate percentages instantly — find X% of a number, percentage change, or increase/decrease by a percentage.
🔬 Scientific Calculator
Free online scientific calculator with sin, cos, tan, log, square root, and more. Supports degrees and radians.
½ Fraction Calculator
Add, subtract, multiply, and divide fractions. Simplifies results using GCD and shows mixed number form.
Ⅻ Roman Numeral Converter
Convert between integers and Roman numerals. Bidirectional converter with conversion steps shown.
💻 Binary to Decimal Converter
Convert between binary, decimal, and hexadecimal instantly. Three-way bidirectional number base converter.
🔤 Number to Words Converter
Convert numbers to English words. Useful for cheque writing, legal documents, and formal writing.
🎓 GPA Calculator
Calculate your college GPA on a 4.0 scale. Add courses, grades, and credit hours for instant results.
📊 Grade Calculator
Find the minimum exam score needed to reach your desired course grade. Enter current grade and exam weight.
☕ Coffee Cost Calculator
Find out how much you spend on coffee per year and whether switching to home brew would save you money.
🐾 Pet Food Calculator
Calculate how much your pet food costs per day, month, and year based on pack size and price.
🎨 Paint Calculator
Calculate how many litres of paint you need to cover walls and ceilings, accounting for doors and windows.
🟦 Tile Calculator
Calculate how many tiles you need for any floor or wall area, with a wastage buffer.
🎂 Age Calculator
Find your exact age in years, months, and days. See birthday countdown, zodiac sign, and total days lived.
🖼️ Wallpaper Calculator
Calculate how many rolls of wallpaper you need for any room, including a 10% waste buffer.
🏋️ Gym vs Home Gym Calculator
Compare the total cost of a gym membership vs building a home gym over 3, 5, or 10 years. Find your break-even point.
❤️ Love Calculator
Find out your love compatibility percentage! Enter two names for a fun, tongue-in-cheek compatibility score.
⛽ Fuel Cost Calculator
Calculate the fuel cost of any trip based on distance, fuel efficiency, and local fuel price.
🏗️ Concrete Calculator
Calculate the volume of concrete needed for any slab, footing, or pour. Get cubic metres, cubic yards, and number of bags.
📅 Age in Days Calculator
Find out exactly how many days old you are today. Also shows your age in weeks, months, and hours.
📆 Days Between Dates Calculator
Calculate the exact number of days, weeks, and months between any two dates instantly.
🌍 Time Zone Converter
Convert any date and time between 25+ world time zones instantly. Includes a live world clock for 6 major cities.
Every calculation runs in your browser — no waiting, no server round-trips.
Finance, health, math, text, education, and lifestyle — one site for all your calculations.
No account, no email, no paywall. Just open any tool and use it.
Use our Percentage Calculator to find X% of a number, calculate percentage change between two values, or work out what percentage one number is of another — all without doing the math yourself.
Paste or type any text into the Word Counter and it instantly counts words, characters (with and without spaces), sentences, and paragraphs. It also estimates reading time and speaking time.
Enter your date of birth in the Age Calculator and it shows your exact age in years, months, and days — along with your next birthday countdown, zodiac sign, and total days you've been alive.
Enter your bill amount and select a tip percentage in our Tip Calculator. It instantly shows the tip amount, total bill, and per-person split if you're sharing the bill with others.
Yes — every tool on WorthIt Tools is completely free, now and always. No account, no email address, no hidden paywall. Just open any tool and use it.
All calculations use standard formulas. Simple tools like the percentage and word counter are exact. The TDEE calculator uses the Mifflin-St Jeor equation. Estimation tools like solar and EV calculators use real-world averages and clearly state their assumptions.