Tool directory

Free calculators that show their work

Fast calculators and tools for money, home projects, dates, health, work, shopping, unit conversions, writing, UTM links, QR codes, and everyday math. Each tool keeps the inputs, result, formula or method, assumptions, and limits visible.

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All tools Money calculators

Popular starting points296 tools live

Percentage CalculatorUse this percentage calculator for common percent math: find a percent of a number, calculate percentage change, or work out what percent one value is of another.Mortgage Affordability CalculatorUse this mortgage affordability calculator to estimate how much house you can afford from income, debts, down payment, rate, loan term, property taxes, insurance, HOA, and debt-limit assumptions.BMI CalculatorUse this BMI calculator to estimate body mass index, BMI category, and a healthy BMI weight range from pounds and feet/inches or kilograms and centimeters.Profit Margin CalculatorUse this profit margin calculator to compare revenue, cost of goods, operating expenses, gross profit, net profit, markup, break-even revenue, and revenue for target margin.Word CounterUse this word counter to count words, characters, sentences, paragraphs, and estimated reading time for any text.QR Code GeneratorUse this QR code generator to create a scannable code for links, WiFi access, contact details, coupons, menus, signs, flyers, and handoffs without uploading the payload.

No account requiredFormula shownExamples includedMobile friendly

Browse by category

Find the tool that matches the question.

Categories stay broad, but each tool page is named around the exact task people search for.

Quick daily mathEveryday Calculators

Common calculators for percentages, dates, tips, age, time, unit conversions, home projects, and other everyday questions.

Personal financeMoney Calculators

Simple calculators for budget, tax estimates, emergency funds, debt payoff, loans, savings, rent, salary, mortgage affordability, and household money math.

Body and nutritionHealth Calculators

Quick health and fitness calculators for BMI, calorie estimates, weight ranges, and everyday wellness planning.

Work and pricingBusiness Tools

Practical tools for rates, invoices, cash flow, cash runway, profit, pricing, and small business planning.

Social metricsSocial Media Tools

Creator tools for TikTok, Instagram, YouTube, engagement, save rates, Shorts RPM, sponsorship pricing, media kits, creator income, and campaign ROI.

Words and namesText and Writing Tools

Text tools for word count, characters, case conversion, hashtags, meta descriptions, platform limits, usernames, hooks, headlines, bios, and CTAs.

Files, links, and web tasksUtility Tools

Browser-first utilities for QR codes, links, files, formats, web snippets, and other practical tasks that do not need a spreadsheet-style calculator.

Popular calculator tasks

Start from the decision you are trying to make.

These groups connect common everyday questions to the calculators that answer them directly.

Shop, split, and compare prices

Fast calculators for discounts, sales tax, tips, unit prices, fuel costs, and percentage checks before you buy.

Discount calculatorSale price, savings, and estimated tax Unit price calculatorCompare price per ounce, pound, item, or serving Price per pound calculatorCompare grocery and bulk packages by cost per pound Price per ounce calculatorCompare grocery and household packages by cost per ounce Price per gram calculatorMetric package comparison by gram and per 100g

Measure rooms and home projects

Practical calculators for square footage, paint, tile, concrete, mulch, soil, sod, gravel, fencing, utilities, and appliance energy.

Square footage calculatorRoom area, total area, and material cost estimate Home project cost plannerMaterials, labor, fees, contingency, budget, and cost per square foot Paint calculatorWall area, gallons needed, and paint cost Room paint calculatorRoom dimensions, wall count, coats, gallons, and cost Concrete calculatorCubic yards, 80 lb bags, and material cost

Convert units and recipe measurements

Specific conversion calculators for common searches: inches, pounds, miles, cups, tablespoons, grams, and kitchen measurements.

Inches to centimeters calculatorExact inch-to-centimeter conversion Pounds to kilograms calculatorWeight conversion for body, luggage, shipping, and gym weights Miles to kilometers calculatorDistance conversion for driving, races, and maps Cups to tablespoons calculatorUS kitchen conversion for recipes Cups to grams calculatorIngredient-aware flour, sugar, butter, oats, rice, and liquid conversions

Plan household money decisions

Budget, paycheck, rent, bill splitting, emergency fund, and savings calculators for household planning.

Budget calculatorMonthly income, spending, savings, and surplus Subscription cost calculatorMonthly, annual, and potentially unused recurring spend Household supplies budget calculatorPaper, cleaning, laundry, personal care, and other supplies Paycheck calculatorGross pay, estimated deductions, and take-home pay Emergency fund calculatorSavings target and time to reach it

Compare loans and payoff plans

Loan calculators for monthly payments, mortgage planning, refinancing, auto loans, and debt payoff.

Mortgage payment calculatorPrincipal, interest, taxes, insurance, and HOA Mortgage vs rent calculatorCompare owner net cost with rent cost over a holding period Car affordability calculatorVehicle price from monthly budget, APR, tax, and fees Loan comparison calculatorCompare monthly payment, total interest, and total cost Loan interest calculatorTotal interest, payoff time, and annual interest preview

Check dates, work hours, and school math

Everyday calculators for date ranges, age, time duration, time cards, grades, GPA, averages, and fractions.

Days between dates calculatorCalendar days, weeks, and optional end-date counting Business days calculatorWeekdays between dates after holiday or PTO adjustments Add business days calculatorDeadline date after adding workdays and skipping weekends Countdown calculatorDays, weeks, and approximate months until a target date Time duration calculatorElapsed time between two clock times

Browse every task group in the directory

Web page QA workflow

Check the page before you send traffic.

Start with the final URL, then check redirects, headers, indexing signals, previews, schema, headings, image alt text, and links.

Run the combined Website Page QA Report Website page QA checklist Redirect Chain Checker HTTP Headers + Cache Checker Canonical URL + Meta Robots Checker Robots.txt + Sitemap Checker Open Graph + Twitter Card Checker JSON-LD Structured Data Checker Heading Structure + H1 Checker Image Alt Text Checker Page Links + Anchor Text Checker

Templates

Copy the setup before calculating.

Template pages give you Markdown, CSV, and checklist formats for workflows that need a little structure before the math.

All templates Decision Matrix Template Vendor Comparison Template Brand Deal Pricing Template

More useful paths

Go deeper without scanning the whole directory.

The homepage stays curated. Use these paths when you need the full library, a page-check workflow, a decision workflow, or a copyable template.

Full directoryFind the exact tool page

Search and filter every live calculator, checker, generator, converter, and utility by task, input, or category.

Web page QACheck a page before promotion

Use the ordered checklist for redirects, headers, indexability, previews, schema, headings, images, and links.

Work decisionsCompare options with visible assumptions

Start with decision matrix, build-vs-buy, vendor comparison, meeting cost, and manual review cost tools.

TemplatesCopy a reusable setup

Use Markdown, CSV, and checklist formats when a workflow needs structure before the calculator result.

GuidesFollow a workflow instead of one-off math

Read practical guides that connect related tools into shopping, writing, moving, business, and page-QA workflows.

Tool standards

Built for checking the math or method, not reading around it.

Tool pages prioritize the usable tool, formula or method, worked example, benchmarks, limitations, and related tools.

No account required

Formula shown

Examples included

Mobile friendly