Travel finance
Japan Trip Budget Calculator
Estimate flights, hotels, meals, transit, shopping, exchange rate, and per-person cost.
Complete directory
Browse Utility Stack tools and guides
Fast calculators, converters, games, and practical guides for travel, money, shopping, text, dates, fitness, tech, and everyday planning.
Featured free tools
Popular starting points
Start here if you want the most useful calculators and converters without scrolling through the full library.
Travel and Japan
Plan trip costs, payment choices, currency, and packing.
Shopping and Sizing
Compare prices, sale totals, currency, and international sizes.
Converters
Clothing and Shoe Size Converter
Convert adult, baby, kids, and shoe sizes across US, UK, EU, Japan, and centimeters.
Shopping
Discount Calculator
Estimate sale price, discount amount, tax, and final total.
Shopping
Sales Tax Calculator
Estimate local sales tax, discounts, quantity, and checkout total.
Home projects
Square Footage & Material Calculator
Estimate flooring boxes, mulch bags, concrete bags, and project material cost.
Shopping
Unit Price Calculator
Compare price per ounce, pound, item, serving, or unit.
IT converter
Data Storage Converter
Convert file sizes and estimate upload or download time.
IT storage
RAID Capacity Calculator
Estimate usable storage, parity or mirror overhead, and reserved capacity.
IT infrastructure
Rack Power and BTU Calculator
Estimate rack watts, BTU/hr, amp draw, circuit headroom, and monthly energy cost.
Networking
Subnet Calculator
Calculate IPv4 CIDR ranges, masks, wildcard masks, and usable hosts.
Networking
IPv4 to Binary Converter
Convert IPv4 addresses to binary octets, 32-bit binary, hex, and integer form.
Developer tool
Unix Epoch Timestamp Converter
Convert epoch seconds, milliseconds, local time, UTC, and ISO timestamps.
Developer tool
Binary Decimal Hex Converter
Convert unsigned values between binary, decimal, hexadecimal, octal, and byte formats.
Developer tool
Base64 URL Encoder Decoder
Encode and decode Base64, URL strings, HTML entities, and JWT header and payload data.
Money Planning
Estimate budgets, payoff paths, savings goals, and big decisions.
Finance
Credit Card Payoff Calculator
Estimate payoff time and total interest from balance, APR, payment, and extra payment.
Finance
Budget Calculator
Estimate income, expenses, debt share, savings rate, and leftover cash.
Finance
Compound Interest Calculator
Estimate future value, recurring contributions, compound growth, and purchasing power.
Finance
Paycheck Calculator
Estimate take-home pay, payroll taxes, withholding, deductions, and annual net income.
Finance
Rent vs Buy Calculator
Compare renting and buying with timeline, home costs, rent increases, and equity.
Finance
Rent Affordability Calculator
Estimate a practical monthly rent target from income, bills, savings, utilities, and buffer.
Finance
Emergency Fund Calculator
Estimate a 3, 6, 9, or 12 month emergency savings target from essential expenses.
Finance
Subscription Cancellation Savings Planner
Estimate monthly, annual, and goal-based savings from canceling unused subscriptions.
Cars and Insurance
Compare car buying, leasing, insurance, and loan estimates.
Finance
Auto Lease vs Buy Calculator
Compare lease and purchase costs with fees, mileage, loan terms, and resale value.
Finance
Car Loan Calculator
Estimate auto loan payments with tax, fees, trade-in, down payment, APR, and term.
Insurance
Car Insurance Calculator
Estimate monthly, six-month, and annual car insurance premiums for quote planning.
Complete directory
All Utility Stack tools and guides
Use these plain links when you want the full library instead of the featured cards above. For guide summaries and reading order, start with the Utility Stack Guides hub.