Tax
1099 Tax Calculator
Estimate 2026 self-employment tax, federal income tax, quarterly payments, and take-home pay.
Free practical tools
Useful tools for everyday decisions
Utility Stack is a growing library of fast, focused tools for calculations, conversions, writing, planning, and practical day-to-day tasks.
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Tool categories
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Money & Finance
Calculators for taxes, loans, savings goals, exchange rates, and practical financial planning.
Finance
Loan Payment Calculator
Estimate monthly payments, total interest, payoff date, and extra payment savings.
Debt Payoff Calculator
Compare snowball and avalanche payoff strategies with balances, APRs, payments, and extra cash.
Credit Card Payoff Calculator
Estimate card payoff time, total interest, and how extra monthly payments change the timeline.
Budget Calculator
Estimate monthly income, expenses, savings rate, debt share, and leftover cash.
Retirement Calculator
Estimate retirement savings, target nest egg, contribution needs, and projected shortfall.
Car Loan Calculator
Estimate auto loan payments with vehicle price, trade-in, sales tax, fees, APR, and term.
Car Insurance Calculator
Estimate monthly, six-month, and annual auto insurance premiums before comparing quotes.
Life Insurance Calculator
Estimate coverage needs from income replacement, debts, education, savings, and existing policies.
Renters Insurance Calculator
Estimate contents coverage, liability, deductible impact, and a rough renters premium.
Mortgage Calculator
Estimate monthly mortgage payments with taxes, insurance, PMI, HOA dues, and down payment details.
Rent vs Buy Calculator
Compare renting and buying with mortgage costs, rent increases, home equity, and investment returns.
Auto Lease vs Buy Calculator
Compare leasing and buying a vehicle with loan payments, resale value, fees, and mileage overage.
Japan Credit Card Fee Calculator
Estimate U.S. credit card charges for Japan purchases, including foreign transaction fees and merchant USD conversion.
Japan Trip Budget Calculator
Plan Japan travel costs in yen and U.S. dollars with flights, hotels, food, transit, shopping, and buffer.
Yen Cash vs Card Calculator
Compare card-in-yen, ATM cash, and merchant USD conversion costs for Japan purchases.
Finance
Savings Goal Calculator
Plan monthly savings, time to goal, deadline needs, and optional interest growth.
Converters
Currency Converter
Convert currencies using latest daily exchange rates for travel, shopping, and planning.
Shopping
Everyday purchase calculators for sales, restaurant bills, and price comparisons.
Shopping
Discount Calculator
Calculate percentage off, sale price, amount saved, tax, and final checkout total.
Shopping
Tip Calculator
Calculate tips, split restaurant bills, round totals, and see each person's share.
Comparison
Unit Price Calculator
Compare price per ounce, pound, count, serving, or custom unit to find the better deal.
Gig Economy
Simple helpers for delivery, rideshare, freelancing, side jobs, and contractor planning.
Converters
Everyday conversion tools for units, clothing, shoes, and international comparisons.
Converters
Unit Converter
Convert common length, weight, temperature, and volume units instantly.
Converters
Clothing and Shoe Size Converter
Convert adult, kids, baby, and shoe sizes between US, UK, EU, Japan, and centimeters.
Luggage Weight Calculator
Estimate checked bag weight in pounds and kilograms before heading to the airport.
Text Tools
Simple writing and typing utilities for drafts, formatting, and practice.
Text
Typing Test
Take a free 1 minute typing test to measure words per minute, accuracy, and mistakes.
Text
Word Counter
Count words, characters, sentences, paragraphs, reading time, and repeated words.
Text
Case Converter
Convert text to uppercase, lowercase, title case, sentence case, camel case, and slugs.
Dates & Planning
Quick helpers for percentages, date spans, exact ages, and planning math.
Math
Percentage Calculator
Calculate percent of a number, percentage change, percent difference, and part-to-whole percentages.
Dates
Date Difference Calculator
Calculate calendar days, business days, weeks, months, and years between two dates.
Dates
Age Calculator
Calculate exact age in years, months, days, total days, hours, and minutes.
Fitness & Health
Practical calculators for training pace, workout planning, and basic health estimates.
Random, Fun & Generators
Fast tools for picking options, testing quick skills, making QR codes, and sharing outputs.
Random
Spin the Wheel
Add names, dinner themes, chores, or choices, then spin a wheel to randomly pick one.
Random
Random Number Generator
Generate one number or a list of random numbers with custom ranges and unique results.
Random
Lottery Number Picker
Generate lottery-style random picks with main numbers, optional bonus ball, and copyable lines.
Fun
CPS Counter
Test clicks per second with a fast desktop click and mobile tap counter.
Generators
QR Code Generator
Create a QR code for a URL, text, email address, or phone number and download it as a PNG.
Generators
Password Generator
Create strong random passwords in your browser with custom length and character options.
Growing steadily
What we are improving next
Deeper calculators
Mortgage, retirement, budget, and comparison tools with clear assumptions.
Related tools
Helpful links between calculators so visitors can move naturally through tasks.
More languages
Gradual Japanese support first, then more high-value multilingual pages.
AdSense polish
Clean page structure, useful guide content, and careful ad placement.
Site maintenance
Templates, reusable patterns, and small checks that keep new tools consistent.