Free Online Calculators and PDF Tools

Every tool on Anchor AI Tools in one place: 53 free online calculators for payroll time, home projects, tax and business, 11 PDF tools that run in your browser, a free SEO audit, and a free temporary email generator.

By Amara Taylor67 free toolsNo signup

Quick answer: Anchor AI Tools has 66 free online tools in eight groups: time and payroll, home and building, money and tax, business and HR, PDF tools, website and SEO, specialist calculators, and privacy tools. Every calculator shows its formula and a worked example, and no account is needed.

Time and payroll calculators

Turn clock time into decimal hours, add up shifts and estimate take-home pay. These are the most used tools on the site. 8 tools · open category page →

Time to Decimal CalculatorConvert a whole week of shifts to decimal hours for payroll and invoicing.Minutes to DecimalAny number of minutes as decimal hours, with the full 1 to 60 chart.Hours to DecimalClock time such as 7:45 or 7h 45m turned into 7.75.Decimal to TimeDecimal hours like 8.75 back into hours and minutes.Hours Worked CalculatorTotal hours from clock-in and clock-out times, minus breaks.Payroll CalculatorEstimate a net paycheck with federal tax, FICA and the standard deduction.Salary to Hourly CalculatorAnnual salary as hourly, daily, weekly and monthly pay.Bonus Tax CalculatorHow much of a bonus you keep after the 22% federal rate and FICA.

Home and building calculators

Measure a space first, then price the job. Cost tools give planning ranges, so get quotes before you commit. 19 tools · open category page →

Square Footage CalculatorArea of rooms, floors and land in square feet.Room Size CalculatorSquare footage of any room from its length and width.Floor Plan Square Footage CalculatorAdd up several rooms for a whole floor plan.Wall Square Footage CalculatorWall area for paint, wallpaper or tile, minus doors and windows.Price Per Square Foot CalculatorCompare homes and project costs per square foot.Square Feet to Square Meters ConverterConvert between square feet and square meters.Concrete CalculatorConcrete volume for slabs, footings and driveways.Concrete Yardage CalculatorCubic yards of concrete to order, with a waste allowance.Asphalt Driveway Cost CalculatorDriveway cost from its size, thickness and local price.Kitchen Remodel Cost CalculatorBudget a kitchen remodel by size and finish level.Bathroom Remodel Cost CalculatorBudget a bathroom remodel by size and scope.Tree Removal Cost CalculatorEstimate tree removal by height, trunk size and extras.Gutter Installation Cost CalculatorGutter cost by length, material and number of stories.Cost to Install Fence CalculatorCompare wood, vinyl, aluminum and chain link fence prices.Chain Link Fence Cost CalculatorChain link install cost by height, grade, gates and removal.Home Replacement Cost CalculatorWhat it would cost to rebuild your home at today’s prices.Construction Cost Per Square Foot CalculatorCost to build a house from a rate or finish quality.Mobile Home Moving Cost CalculatorTransport cost by home size and distance, plus setup.Replacement Windows Cost CalculatorWindow replacement cost by count, frame and install type.

Money and tax calculators

Percentages, payments and federal and state taxes, fees and life insurance coverage. The tax tools are also grouped on the tax calculators hub. Confirm final figures with the tax office, lender or agency. 14 tools · open category page →

Percentage CalculatorPercent of a number, percentage change, increases and discounts.Mortgage CalculatorMonthly payment with principal, interest, tax and insurance.Reverse Sales Tax CalculatorFind the pre-tax price and the tax inside a total.NY State Tax CalculatorEstimate New York State income tax on your earnings.Michigan Property Tax CalculatorProperty tax from taxable value and local millage.Oklahoma Auto Tax, Title and License CalculatorExcise tax, registration and title fees before you visit the agency.Texas Auto Tax, Title and License CalculatorThe 6.25% Texas sales tax plus title and registration fees.Vehicle Tax, Title and Registration CalculatorItemized vehicle fees by state.Tax Refund CalculatorRefund or balance due from your income, filing status and withholding.Income Tax CalculatorFederal income tax, effective rate and payroll tax by filing status.Tax Bracket CalculatorFind your marginal rate and see income in each bracket.Self-Employment Tax CalculatorSocial Security and Medicare tax on your net profit.1099 Tax CalculatorIncome tax and self-employment tax to set aside from contractor pay.Life Insurance CalculatorEstimate how much coverage your family may need from income, debts, savings and goals.Life Insurance Needs CalculatorCompare the DIME method, income multiples and human life value side by side.Term vs Whole Life CalculatorCompare two quotes and what the premium difference could grow to.

Business and HR calculators

Margins, manufacturing costs and workforce rates, with the formula shown for your reports. 8 tools · open category page →

Gross Margin CalculatorGross margin, gross profit and markup, or the price for a target margin.COGM CalculatorCost of Goods Manufactured from materials, labor, overhead and WIP.Total Manufacturing Cost CalculatorDirect materials, direct labor and overhead in one total.Employee Turnover Rate CalculatorMonthly or annual staff turnover as a percentage.Unemployment Rate CalculatorUnemployment rate from the labor force and jobless count.Labor Force Participation Rate CalculatorShare of the working-age population in the labor force.Engagement Rate CalculatorSocial media engagement rate by followers or reach.Pet Sitting Rate CalculatorWhat to charge for drop-in visits, walks and overnight stays.

PDF tools

Every PDF tool opens and changes your file inside your browser tab. Nothing is uploaded or stored. 11 tools · open category page →

PDF EditorRetype existing text, add images and signatures, annotate and redact.PDF ConverterImages to PDF, PDF pages to JPG, PNG or WEBP, and PDF to text.Merge PDFCombine several PDFs, pick page ranges and reorder them.Split PDFExtract or remove pages, or split a file into chunks.Compress PDFShrink a PDF for email or upload while keeping it readable.Rotate PDFFix sideways or upside-down pages and save the file.Sign PDFDraw, type or upload a signature and place it on the page.Watermark PDFAdd a text or image watermark to every page.Add Page Numbers to PDFNumber pages with your choice of position and format.Annotate PDFHighlight, underline, draw, comment and stamp.Fill PDF FormFill real form fields, or type and tick on flat forms.

Website and SEO tools

Check how a page is set up for search engines and AI answers. 1 tool and 5 guides · open category page →

Free SEO Audit ToolOn-page SEO health, meta tags, headings and AI search visibility.

Privacy tools

A free, working disposable inbox for one-time signups and verification links, with no account needed. 1 tool · open category page →

Temporary Email GeneratorGet a working address in seconds, receive mail instantly, delete it when you are done.

More calculators

Specialist tools that do not fit a category above. 4 tools · open category page →

Power to Weight Ratio CalculatorPower-to-weight ratio from engine output and vehicle weight.Puppy Weight CalculatorEstimate adult dog weight from age, size and current weight.Protein Molecular Weight CalculatorMolecular weight of a protein or peptide from its sequence.Volumetric Flow Rate CalculatorFlow rate from pipe size and velocity, or volume and time.

How to choose the right calculator

Start with the question you need answered. For a timesheet or an invoice, the time to decimal calculator converts a whole week at once, while minutes to decimal is quicker for a single value.

For a building or home project, measure first and price second. Get the area with the square footage calculator, then move to the concrete calculator or a cost estimator for that job.

For tax and fee questions, pick the state-specific tool where there is one, because rates and fees change from state to state. Each of those pages links to the official source it uses.

Guides that explain the maths

How to Convert Time to Decimal for PayrollStep-by-step guideHow to Calculate Overtime PayStep-by-step guideHow to Measure Square Footage of a HouseStep-by-step guideHow to Calculate Gross MarginStep-by-step guideHow to Calculate MarkupStep-by-step guideHow to Do an SEO Audit in 10 StepsStep-by-step guide

Frequently asked questions

Are these online calculators really free?

Yes. Every calculator, converter and PDF tool on this page is free to use as often as you like, with no account, no trial and no watermark on PDF output. The site is funded by advertising, which is kept separate from the tools.

Do the calculators work on a phone?

Yes. Every tool is built to work on phones, tablets and desktop browsers, and the results update as you type.

How accurate are the calculators?

Each calculator shows its formula and a worked example, so you can check the result by hand. Cost, tax and payroll tools give planning estimates, so confirm final figures with a qualified professional or the relevant authority.

Is my data private when I use a tool?

Numbers you type are worked out in your browser and are not stored. PDF tools open and change your file inside your browser tab, so the document is never uploaded to a server.

Which calculator should I use for payroll?

Use the Time to Decimal Calculator for a full week of shifts, Minutes to Decimal for a single value or the 1 to 60 chart, and the Hours Worked Calculator when you start from clock-in and clock-out times.

Will more tools be added?

Yes. New calculators and guides are added regularly, and you can suggest one through the contact page.

Amara Taylor, who builds and maintains Anchor AI Tools
Built and checked by Amara Taylor

Content Lead, Anchor AI Tools, California, USA. Need a tool that is not here? Email hello@anchoraitools.com. See how tools are tested in our editorial standards.

Sponsored: see partner offers