Need a quick number for payroll, a home project, or your taxes? Every free online calculator from Anchor AI Tools lives on this one page: payroll time conversion, square footage and room measurement, concrete volume, mortgage and tax estimates, home project costs, business and HR rates, percentages, and a handful of specialized tools besides. The PDF tools and the SEO audit are listed at the bottom. Each one runs instantly in your browser, shows the formula behind the answer, and includes a worked example so you understand the result instead of just copying a number.
Quick Answer: Anchor AI Tools offers 39 free online calculators across seven categories: Math (percentages), Time & Payroll (convert hours and minutes to decimal for payroll), Home & Measurement (square footage, room size, and concrete volume), Finance & Tax (mortgage and state/local tax estimates), Cost Estimators (driveway, remodel, home replacement, construction, and other home-project costs), Rates & Metrics (HR, business, and social-media rates), and a few specialized Other Calculators. Alongside them sit six PDF tools and a free SEO audit tool. Everything is free, needs no signup, and runs instantly in your browser.
No tool matches that search. Try a shorter word like "time", "tax", "square", or "pdf".
Quick everyday math for percentages, changes, markups, and discounts.
Convert clock time to decimal hours for timesheets, invoices, and payroll runs.
Time to Decimal Calculator
Convert hours and minutes to decimal hours for payroll and invoicing.
Minutes to Decimal
Turn any number of minutes into decimal hours, with a full 1โ60 chart.
Hours to Decimal
Convert combined hours-and-minutes values like 7h 45m into 7.75.
Decimal to Time
Convert decimal hours like 8.75 back into hours and minutes.
Hours Worked Calculator
Calculate total hours worked from clock-in and clock-out times, minus breaks.
Measure rooms, floors, walls, and land, then work out the concrete you need.
Square Footage Calculator
Measure the area of rooms, floors, and land in square feet.
Room Size Calculator
Get the square footage of any room from its length and width.
Floor Plan Square Footage
Add up multiple rooms to get the total square footage of a floor plan.
Wall Square Footage Calculator
Measure wall area for paint, wallpaper, or tile, with doors and windows excluded.
Price Per Square Foot
Compare home prices and project costs on a per-square-foot basis.
Sq Ft to Sq Meters Converter
Convert between square feet and square meters instantly.
Concrete Calculator
Estimate concrete volume for slabs, footings, and driveways.
Concrete Yardage Calculator
Cubic yards for slabs, footings, and columns, with bag counts and waste allowance.
Estimate mortgage payments, state and local taxes, and vehicle fees.
Mortgage Calculator
Estimate monthly mortgage payments with taxes and insurance included.
Reverse Sales Tax Calculator
Back out the tax from any total to find the original pre-tax price and the exact tax paid.
NY State Tax Calculator
Estimate your New York state income tax by filing status using the latest progressive brackets.
Oklahoma Auto Tax, Title & License
Work out excise tax, sales tax, registration, and title fees for a new or used Oklahoma vehicle.
Michigan Property Tax Calculator
Estimate Michigan property taxes from your home's taxable value and local millage rate.
Put a realistic 2026 price on your next home project before you get quotes.
Asphalt Driveway Cost
Estimate 2026 asphalt paving costs by size, thickness, and site conditions, plus the tonnage you need.
Kitchen Remodel Cost
Budget a kitchen renovation across cabinets, counters, appliances, and labor with a clear low-to-high range.
Bathroom Remodel Cost
Price a bathroom refresh or full remodel by scope, fixtures, and finishes before you call a contractor.
Tree Removal Cost
Estimate tree removal costs by height and access, plus stump grinding.
Gutter Installation Cost
Price new gutters by linear feet, material, guards, and downspouts for a realistic 2026 estimate.
Cost to Install a Fence
Compare wood, vinyl, aluminum, and chain link fence prices by length, height, and gates.
Chain Link Fence Cost
Estimate a chain link fence install by height, material grade, gates, and old-fence removal.
Home Replacement Cost
Estimate what it would cost to rebuild your home at today's construction prices, useful for insurance conversations.
Construction Cost Per Sq Ft
Estimate the cost to build a house using your own rate or a finish-quality and region tier.
Mobile Home Moving Cost
Estimate transport cost by home size and distance, with optional setup and permit add-ons.
Replacement Windows Cost
Estimate total cost by window count, frame material, size, and installation type.
Work out business, HR, marketing, and science rates, from what you should charge to standard HR and labor-economics formulas.
Pet Sitting Rate Calculator
Work out what to charge for drop-in visits, dog walking, or overnight pet sitting.
Volumetric Flow Rate Calculator
Calculate flow rate from area and velocity, or volume and time, in GPM, CFM, and more.
Employee Turnover Rate Calculator
Calculate turnover rate from headcount and separations, with a voluntary/involuntary split.
Unemployment Rate Calculator
Find the unemployment rate from employed and unemployed counts using the standard formula.
Labor Force Participation Rate
Find what share of the working-age population is in the labor force.
Engagement Rate Calculator
Calculate social media engagement rate by followers, reach, or impressions.
Specialized tools for performance, pet growth estimates, and scientific calculations.
Power-to-Weight Ratio Calculator
Calculate power-to-weight ratio from engine output and vehicle weight for quick performance comparisons.
Puppy Weight Calculator
Estimate adult dog weight from your puppy's current age, size, and weight using common growth estimates.
Protein Molecular Weight Calculator
Estimate the molecular weight of a protein or peptide from its amino acid sequence.
Six browser-based PDF tools. Your file is read and rebuilt on your own device, so nothing is uploaded to a server and no account is needed.
PDF Editor
Click existing text to retype it, add images and signatures, annotate, and genuinely redact.
PDF Converter
Images to PDF, PDF pages to JPG, PNG or WEBP, PDF to plain text, and image-to-image.
Compress PDF
Shrink a PDF for email, upload, or storage while keeping it clear and readable.
Split PDF
Extract or remove pages, burst every page, or divide into chunks. Six ways to split a file.
Merge PDF
Combine several PDFs into one, picking page ranges from each and dragging to reorder.
New
Rotate PDF
Fix sideways or upside-down pages and save it permanently. Finds the crooked pages for you.
See how a site looks to search engines and AI answer engines.
Step-by-step tutorials that pair with the tools above.
Start with what you're trying to answer. If you're processing a timesheet or an invoice, the time to decimal calculator handles the full conversion, while the minutes-to-decimal and hours-to-decimal pages answer single lookups fastest. If you're measuring a space, begin with the square footage calculator for a single area, or the floor plan tool when you need to total several rooms.
For projects that involve buying material, measure first, then estimate: get your area with a measurement tool, then move to the concrete calculator for volume or a cost estimator for a realistic budget range, including the home replacement cost calculator if you're budgeting for an insurance conversation rather than a renovation. Budgeting a mortgage or a tax bill instead? Start in the Finance & Tax section, and if you're tracking HR, business, or social metrics, the Rates & Metrics section covers turnover, unemployment, and engagement rate in one place. Every calculator on this page shows its formula and a worked example, so you can verify the math by hand before you rely on it.
All 39 free online calculators run entirely in your browser. Your numbers are never uploaded to a server, there's nothing to install, and no account is needed. The same is true of the six PDF tools: your document is read and rebuilt inside the browser tab rather than sent anywhere.
If you are not sure which tool you need, the time to decimal calculator is the most used page on the site, and the SEO audit tool is the quickest way to get something useful back with a single input.
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Every tool listed here is checked against its standard formula or method, and this index is updated whenever a tool ships or changes ยท How we check our tools
Maintained by Amara Taylor for Anchor AI Tools ยท Last reviewed September 13, 2026 ยท ยฉ 2026 Anchor AI Tools
