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Free online calculators
Free online calculators
and tools.
SudoTool is a collection of free, browser-based calculators and tools for home projects, personal finance, and everyday tasks. No account, no installation — just open and get things done.
Featured Tools
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Flooring Calculator
Boxes, square feet, and carpet square yards for laminate, vinyl plank, hardwood, and carpet. Multi-room input, waste factors, and real 12 ft roll math.
Home
Tile Calculator
Tiles, boxes, grout, and trim with NTCA-aligned waste factors (10/15/18/20% by pattern). Subway, hex, large format, mosaic sheets. Imperial and metric.
Home
Paint Coverage Calculator
How many gallons of paint do you need? Accounts for surface texture, finish, coats, doors, windows — with optional cost estimate. 100% in your browser.
Home
Sleep Cycle Calculator
Find the best bedtime or wake time using 90-minute sleep cycles. Live "going to bed now" mode, visual NREM/REM timeline, and CDC age guidelines.
Lifestyle
Rent vs Buy Calculator
See your exact break-even year and the rent threshold where buying wins. Year-by-year net worth table. Save named scenarios locally, no signup.
Finance
Credit Card Payoff Calculator
Compare debt snowball vs avalanche side by side. Up to 5 cards, extra payments, lump sums, and promo APRs. Auto-saves in your browser.
Finance
Auto Loan Calculator
US auto loan payments with state sales tax, trade-in credit, and fees. 50-state tax logic, credit-tier APR presets, side-by-side term comparison, and full amortization.
Finance
Mortgage Calculator
US mortgage payments with PMI, taxes, insurance, and extra payment scenarios. ZIP-based tax auto-fill, full amortization, and screenshot-ready share cards.
Finance
Readability Score Checker
Analyze text readability with 7 algorithms. Visual sentence highlighting, improvement tips, and grade-level targeting. Free and private.
Writing
Why SudoTool?
No signup required
Every tool on SudoTool is available instantly. No account, no email, no password.
Just open your browser and start working.
Built for everyone
Whether you're a software engineer or just need to format a file for the first time,
our tools are designed to be simple and approachable.
Free, always
All tools on SudoTool are completely free to use. We believe useful utilities should
be accessible to everyone, without paywalls.
About SudoTool
SudoTool is a growing collection of free online calculators and tools designed to make everyday tasks easier. Each one is purpose-built to be fast, reliable, and useful — whether you're planning a home project, working out your finances, or just need something done quickly.
We built SudoTool because too many useful tools are hidden behind sign-up walls, ads, or paywalls. Our goal is simple: provide clean, no-nonsense tools that work in any browser, on any device, for anyone.
New tools are added regularly. If you have a suggestion for a tool you'd like to see, feel free to reach out.
From the Blog
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Can You Put Heavy Furniture on a Floating Floor?
Two different failures hide behind one question. Blocked movement buckles the seams — Mohawk requires kitchen cabinets to go in before the floor — while point pressure dents planks, and a piano on three casters beats a fridge at 333 psi against a 250 psi spec.
T-Molding vs Reducer: Which Transition Strip?
The line between the two profiles is 8 mm of height difference, and in a doorway a T-molding can be a requirement rather than a choice — 4 ft or less on Pergo laminate, 32 inches on Mohawk RevWood Contract. Plus the 1/4-inch gap every transition has to leave.
0% APR vs Cash Rebate: The Break-Even Math
The size of the rebate isn't the deciding number — the promotional rate is. On $45,000 over 60 months, a $3,500 rebate only ties a 3.06% promo rate if your own loan would be at the 6.39% average, so a true 0% offer wins.
How to Measure Stairs for Vinyl Plank Flooring
Treads are the easy half — adding risers takes a 13-step flight from 29.8 to 55 sq ft. Per-step square footage, box counts, and why stair nose moulding can't be pieced together from offcuts.
The True Cost of Owning a Home Beyond the Mortgage
Property tax, insurance and maintenance add roughly 1–4% of a home's value every year — about $800 a month on a $400,000 house. Why the payment is only about 70% of what owning actually costs.
Is a Credit Card Annual Fee Worth It? The Break-Even Math
An annual fee pays off only if the card beats a free one by more than the fee costs. The average $127 fee needs about $12,700 a year in spending at a one-point edge — and none of that matters if you carry a balance.