Calculators for the numbers you keep looking up
Mortgage payments, BMI, compound interest, JSON formatting, tips, time zones. Pick a tool, enter the numbers, and move on.
Compound Interest
Calculate how your money grows over time with compound interest.
financeMortgage
Estimate monthly mortgage payments and total interest.
financeSalary & Tax
Calculate your take-home pay after federal and state taxes.
financeInvestment Return
Project your investment growth with regular contributions.
financeRetirement Savings
Plan how much you need to save for a comfortable retirement.
financeDebt Payoff
Find out when you'll be debt-free and total interest paid.
financeNet Worth
Track your total assets minus liabilities in one place.
financeTip Calculator
Quickly calculate tips and split bills between friends.
financeLoan EMI
Calculate your equated monthly installment for any loan.
financePercentage
Calculate percentages, increases, decreases, and ratios.
financeBMI Calculator
Check your Body Mass Index based on height and weight.
healthCalorie Calculator
Estimate your daily calorie needs for your goals.
healthBody Fat Calculator
Estimate your body fat percentage using the US Navy method.
healthWater Intake
Find your daily water intake recommendation in glasses and liters.
healthWord Counter
Count words, characters, sentences, and paragraphs.
utilityJSON Formatter
Format, validate, and pretty-print JSON with syntax highlighting.
utilityPassword Generator
Generate strong, secure random passwords.
utilityAge Calculator
Calculate your exact age in years, months, and days.
utilityColor Converter
Convert colors between HEX, RGB, HSL, and CMYK formats.
utilityCurrency Converter
Convert between USD, EUR, GBP, JPY, and more with example rates.
financeInflation
Calculate how inflation affects purchasing power over time.
financeSavings Goal
Find out how long it takes to reach your savings target.
financeBreak-Even
Calculate the break-even point in units and revenue.
financeProfit Margin
Calculate profit margin, gross margin, and markup percentage.
financeHourly to Salary
Convert hourly wage to annual salary and vice versa.
financeDown Payment
Calculate total cash needed to buy a home.
financeCredit Card Payoff
Find your payoff date and total interest on credit card debt.
financePregnancy Due Date
Calculate your due date and track pregnancy milestones.
healthSleep Calculator
Find optimal bedtimes and wake times based on sleep cycles.
healthHeart Rate Zone
Calculate your 5 training heart rate zones.
healthMacro Calculator
Get your ideal protein, carb, and fat breakdown.
healthBase64 Encoder
Encode and decode Base64 strings.
utilityLorem Ipsum
Generate placeholder text in paragraphs, sentences, or words.
utilityTimestamp Converter
Convert Unix timestamps to human-readable dates and back.
utilityGPA Calculator
Calculate your semester or cumulative GPA on a 4.0 scale.
utilityUnit Converter
Convert between metric and imperial units for length, weight, temperature, and more.
utilityDiscount Calculator
Calculate sale price after discounts with stacked discount and tax support.
financeCar Loan
Estimate monthly car payments with down payment, trade-in, and interest.
financePaycheck
Calculate your take-home pay after taxes, FICA, 401(k), and deductions.
financeMortgage Refinance
Compare your current mortgage to a refinanced loan and find your break-even point.
financeTime Zone Converter
Convert times between any world time zone with a quick reference grid.
utilityFrom the Blog
View all posts →Your Pregnancy Due Date: How It's Calculated and What to Actually Expect
Your due date is an estimate, not a deadline. Here's the math behind it, why it's often wrong, and what actually matters week by week.
7 min readFinanceUnderstanding Your Paycheck: Where Your Money Actually Goes
You earn $75,000 but take home $56,000. Where does the rest go? Here's every deduction on your paycheck explained with real numbers.
8 min readFinanceShould You Refinance Your Mortgage? The Math That Actually Matters
Refinancing could save you $175/month, or cost you money. The break-even point tells you which. Here's how to calculate it.
8 min readToolsTime Zones Explained: Why It's Tomorrow in Tokyo When It's Today in New York
When it's 9 AM in New York, it's 10 PM in Tokyo. Here's why time zones exist, how they work, and how to stop getting confused by them.
7 min readFinanceHow Car Loans Work: Interest, Payments & What Dealers Won't Tell You
A longer loan term means a lower monthly payment, but you'll pay thousands more in interest. Here's the math dealers don't want you to see.
8 min readFinanceHow to Calculate Discounts (And Why 20% + 10% Off Isn't 30%)
When a store says "20% off, then an additional 10% off," the second discount applies to the already-discounted price. Here's the math that matters.
7 min read