Universal Tools Directory
Explore our suite of professional calculators for finance, health, and more.
Tax Calculators
Salary Calculator
Estimate US take-home pay from hourly, monthly, or annual salary. See federal tax, FICA, and adjustable state tax deductions with 2026 assumptions.
Loan Calculators
Mortgage Calculator
Estimate monthly mortgage payments with property tax, insurance, PMI, and HOA fees. Adjust your down payment and interest rate, then view amortization.
Auto Loan Estimator
Calculate monthly car payments with vehicle price, sales tax, fees, down payment, and trade-in value. View loan interest and an amortization schedule.
Amortization Schedule
Create a monthly loan amortization schedule from your loan amount, interest rate, term, and start date. See principal, interest, and remaining balance.
Finance Calculator (TVM)
Solve time value of money problems for present value, future value, payment, interest rate, or periods. Choose beginning- or end-of-period payments.
Student Loan Calculator
Estimate student loan payments from balance, rate, and term. Add an extra monthly payment to compare payoff time, total interest, and interest savings.
Student Loan Repayment
Find a student loan payoff date from your balance, interest rate, and monthly payment budget. Estimate the repayment timeline and total interest cost.
Credit Card Payoff
Estimate how long it takes to pay off a credit card or find a payment for your target payoff date. See interest costs and a monthly repayment schedule.
Inflation Calculator
Compare purchasing power using selected historical US CPI annual averages, or project future costs with your own assumed inflation rate and time period.
Investment Strategies
Compound Interest
Estimate investment growth with an initial deposit and monthly contributions. Compare years, assumed return, total contributions, and compound interest.
401k Retirement Planner
Project 401(k) retirement savings with employee contributions, employer matching, salary growth, and assumed returns. See an inflation-adjusted balance.
Roth IRA Calculator
Estimate a future Roth IRA balance from your starting savings, annual contributions, expected return, and retirement age. Explore contribution scenarios.
Stock Profit Calculator
Calculate stock profit or loss after buying and selling commissions. Enter share prices and quantity to estimate ROI and a break-even sale price.
Savings & Budget
Emergency Fund Calc
Set an emergency savings goal using monthly expenses and your target months of coverage. See your savings shortfall and how many months you can cover.
Estate Tax Calculator
Estimate federal estate tax from assets, deductions, and lifetime exemption used. Select a supported year, including the $15 million 2026 exclusion.
Dining & Tipping
Tip Calculator
Calculate a restaurant tip and split the bill among your group. Adjust the tip percentage and number of people to see each person's share.
Health & Fitness
BMI Calculator
Calculate adult body mass index using metric or US units. Enter height and weight to see a BMI estimate, category, and corresponding weight range.
Calorie Calculator
Estimate daily maintenance calories, TDEE, and BMR from age, height, weight, and activity. Compare the tool's calorie scenarios with your own needs.
Body Fat Calculator
Estimate body fat percentage using the Navy circumference method. Enter the requested height, neck, waist, and hip measurements in metric or US units.
Ideal Weight Calculator
Compare ideal body weight estimates from Devine, Robinson, Miller, and Hamwi formulas. Adjust height and frame size, and view the adult BMI weight range.
Date & Time
Date Duration
Count calendar days, weeks, months, and years between two dates. Choose whether to include the end date and compare the date-duration breakdown.
Age Calculator
Calculate age from a date of birth to today or a chosen date. See years, months, days, total days, and the next birthday countdown.
Time Calculator
Find the duration between clock times or add and subtract hours and minutes. Compare start and end times, including a modeled crossing of midnight.
Date Calculator
Add or subtract days, weeks, months, and years from a calendar date. Find a future or past date using the interval you choose.
Day of the Week Calculator
Find the weekday for a chosen date, including a birthday or future event. See additional date details such as day of year and leap-year status.
Science
Speed Calculator
Calculate average speed, distance, or travel time from the other two values. Compare supported units such as mph, km/h, meters per second, and knots.
Temperature Calculator
Convert temperatures between Celsius, Fahrenheit, Kelvin, and Rankine. Enter a value and its scale to see equivalent temperatures instantly.
Velocity Calculator
Solve constant-acceleration kinematics for velocity, acceleration, time, or displacement. Enter known values and review the equations used.
Technology
Cron Job Scheduler
Build and validate five-field cron expressions. Read a plain-language schedule explanation and preview upcoming runs with the visual crontab builder.
Bandwidth Calculator
Estimate file transfer time from file size and connection speed. Convert bandwidth units, including Mbps and bytes, to compare download scenarios.
Binary Converter
Convert text and numbers between binary, decimal, and hexadecimal modes. Explore binary-to-text conversion and supported number-base conversions.
IP Subnet Calculator
Calculate network addresses and host ranges from an IP address and CIDR prefix. View IPv4 subnet masks, wildcard masks, and supported IPv6 ranges.
Password Generator
Generate random passwords in your browser with your chosen length, letters, numbers, and symbols. Create a fresh set and copy the password you choose.
QR Code Generator
Create a custom QR code with your logo and colors, then download PNG or SVG. Generate codes for links, text, Wi-Fi, email, or SMS without an account.
Barcode Generator
Create barcode labels for products and inventory. Choose a supported format, customize label fields, and download or print your barcode artwork.
Education
GPA Calculator
Calculate credit-weighted GPA from course grades and credits. Choose a 4.0, 4.33, or percentage scale and adjust courses to compare your results.