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Explore category hubs for finance, health, productivity, education, conversion, home, business, and technology tools.
finance
Finance
Money planning tools for loans, budgeting, and smarter financial decisions.
Loan Calculator
Estimate monthly payments, total interest, and total repayment for mortgage, auto, and personal loans with optional down payment and extra monthly payment inputs.
Paycheck Calculator
Estimate per-paycheck gross pay, federal and state withholding, employee payroll taxes, and take-home pay using pay frequency, filing status, pre-tax deductions, and optional extra withholding.
Debt-to-Income Calculator
Estimate front-end and back-end debt-to-income ratios using gross income, housing payment, recurring monthly debts, and target DTI limits for mortgage planning or general budget checks.
Tax Calculator
Estimate federal income tax, state income tax, and employee payroll taxes for tax year 2025 with filing-status support, itemized deductions, and either a federal-taxable or custom state tax base.
Compound Interest Calculator
Project future investment growth with starting principal, recurring monthly contributions, contribution growth, compounding frequency, inflation, and optional target tracking.
Credit Card Payoff Calculator
Estimate payoff time for credit card debt using issuer minimum payments or a fixed payment strategy, including intro APR periods, annual fees, balance transfer fees, and extra monthly payments.
Savings Goal Calculator
Calculate how long it may take to reach a savings target or how much you need to save each month, with APY, inflation, contribution growth, and contribution timing options.
Retirement Calculator
Estimate retirement savings growth, target nest egg, inflation-adjusted income needs, and funding gap using current savings, monthly contributions, and expected return assumptions.
APR Calculator
Estimate APR for a fixed-payment loan using loan amount, prepaid fees, monthly payment, and loan term to compare borrowing offers more clearly.
real-estate
Real Estate
Mortgage, affordability, and home-buying tools for housing decisions with bigger financial stakes.
Mortgage Refinance Calculator
Compare staying with your current mortgage versus refinancing using a new rate, new term, closing costs, cash-out, and optional extra monthly payments.
Rent vs Buy Calculator
Compare renting and buying with mortgage costs, taxes, insurance, HOA, maintenance, PMI, appreciation, selling costs, rent growth, and investment return assumptions.
Mortgage Calculator
Estimate monthly mortgage costs using home price, down payment, APR, taxes, insurance, HOA, PMI, and extra payment assumptions, with a first-year amortization preview.
Home Affordability Calculator
Estimate how much house you can afford using income, monthly debts, down payment, APR, taxes, insurance, HOA, PMI, closing costs, and front-end and back-end DTI targets.
Pay Off Mortgage Faster Calculator
Compare mortgage payoff strategies using remaining balance, remaining term, APR, current principal and interest, PMI, insurance growth, HOA, extra monthly budget, and annual lump-sum assumptions.
Amortization Calculator
Analyze loan amortization with APR, term, extra monthly payments, and annual extra payments, then compare payoff speed, interest cost, and yearly balance milestones.
health
Health
Wellness calculators that turn everyday inputs into quick, useful guidance.
BMI Calculator
Calculate body mass index instantly using US or metric units, see your BMI category, and share a stateful link with the current inputs.
Calorie Calculator
Estimate BMR, maintenance calories, and goal calories for fat loss, maintenance, or weight gain with activity adjustments and planning ranges.
TDEE Calculator
Estimate total daily energy expenditure using multiple BMR formulas, activity multipliers, and optional body-fat input for Katch-McArdle.
Calorie Deficit Calculator
Calculate the calorie deficit required to reach a target weight within a chosen timeline using either an auto-estimated or manually entered maintenance intake.
Due Date Calculator
Estimate due date and pregnancy milestones using last menstrual period, conception date, or IVF transfer date with embryo-age support.
Ovulation Calculator
Predict ovulation date, fertile window, and upcoming cycle dates based on last period, cycle length, and luteal phase assumptions.
math
Math
Fast practical math tools designed for study, work, and daily problem solving.
Percentage Calculator
Solve common percentage problems fast: calculate X% of Y, find what percent one value is of another, and measure percentage change between two numbers.
Age Calculator
Calculate exact age in years, months, and days from a birth date, with total days, total months, and next birthday countdown.
Random Number Generator
Generate random integers across custom ranges, control duplicate behavior, and roll RPG-style dice with modifier support.
productivity
Productivity
Time, date, and work-planning tools that help users organize schedules and daily output.
Date Calculator
Compare two dates or add and subtract days, weeks, months, and years with inclusive date counting and calendar-aware results.
Work Hours Calculator
Estimate daily hours, weekly hours, overtime, and gross pay from shift times, unpaid breaks, workdays per week, and pay assumptions.
Text Case Converter
Convert text across sentence, title, uppercase, lowercase, snake_case, kebab-case, camelCase, and PascalCase styles.
Word Counter
Count words, characters, sentences, paragraphs, and reading time in real time, with speaking-time estimates and top-word frequency insights.
Time Calculator
Calculate elapsed time between two times, or add and subtract durations from a base time with automatic midnight rollover handling.
unit-conversion
Unit Conversion
Clean conversion tools for common measurements used in work, travel, study, and home projects.
Length Converter
Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, and miles with a full reference table.
Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin while also reviewing the value in all three scales and a plain-language temperature description.
Weight Converter
Convert mass and weight units including mg, g, kg, oz, lb, stone, and metric tonnes with instant reverse and all-unit equivalents.
Area Converter
Convert area units including square feet, square meters, acres, hectares, and square miles with quick all-unit comparisons.
Volume Converter
Convert volume units across metric, US kitchen, and container measurements including mL, L, cups, pints, quarts, and gallons.
Speed Converter
Convert speed units such as mph, km/h, m/s, ft/s, and knots for travel, fitness, and technical workflows.
Pressure Converter
Convert pressure units including Pa, kPa, bar, psi, atm, mmHg, and inHg for automotive, weather, and engineering contexts.
Data Size Converter
Convert between bits, bytes, decimal units (KB/MB/GB), and binary units (KiB/MiB/GiB) with instant equivalence tables.
education
Education
Academic calculators for grades, GPA planning, and classroom decision making.
GPA Calculator
Estimate semester GPA from course grades and credit hours using a standard 4.0 scale with plus and minus grading support.
Grade Calculator
Estimate the final exam score needed to hit a target course grade and preview outcome scenarios at different final exam scores.
Citation Generator
Generate in-text or reference-list citations for websites, books, and journal articles with selectable APA 6, APA 7, MLA, and Chicago styles.
home-lifestyle
Home & Lifestyle
Room, renovation, and living-space tools built for practical project planning.
Paint Calculator
Estimate how much paint to buy for a room using wall dimensions, ceilings, coats, openings, coverage rates, and paint price.
Flooring Calculator
Estimate flooring area, waste allowance, box count, and material cost using room dimensions, extra area, coverage per box, and price.
business
Business
Pricing, profitability, and operating calculators for small business and solo operators.
Profit Margin Calculator
Analyze profit, margin, markup, and monthly profit from unit cost, selling price, payment fees, and unit volume, or solve for a required target margin.
Break-Even Calculator
Estimate break-even units, break-even revenue, contribution margin, and target-profit sales using fixed costs, variable cost, price, and monthly volume.
technology
Technology
Networking, data, and developer utility tools for technical workflows.
Password Generator
Generate strong random passwords with configurable length, character sets, and similarity filtering, then copy secure results instantly.
URL Shortener
Shorten long links using public providers with provider selection, quick copying, and shareable query state for repeat workflows.
JSON Formatter & Validator
Validate, format, and minify JSON with optional key sorting, output metrics, and one-click copy or download.
Base64 Encoder & Decoder
Encode plain text to Base64 or decode Base64 back to text with optional URL-safe output and padding controls.
Image Compressor & Resizer
Compress and resize images directly in the browser with width and height controls, quality tuning, format conversion, and instant file download.
JPG to PDF Converter
Merge one or multiple JPG images into a downloadable PDF with page size, orientation, and margin controls.
Word to PDF Converter
Convert DOCX files into browser-generated PDFs with configurable page size, margin, and base font settings while preserving readable text, headings, lists, and simple table rows.
PDF to Word Converter
Convert text-based PDF pages into a browser-generated DOCX file with page-selection support and explicit layout-fidelity limits.
Merge PDF
Combine multiple PDF files into one output document while preserving page order from your selected files.
Split PDF
Split a PDF by selected page ranges or export every page as separate PDF files in a ZIP archive.
Rotate PDF
Rotate all or selected PDF pages by 90, 180, or 270 degrees and download a corrected output file in the browser.
Delete PDF Pages
Remove selected pages from a PDF file in the browser and download a new output document without those pages.
PDF to JPG Converter
Convert selected PDF pages into high-quality JPG images with page range, scale, and quality controls.
PDF Compressor
Compress PDF files in the browser with scale and quality controls, before-and-after size comparison, and instant download.
Internet Speed Test
Test internet download speed, upload speed, ping, and jitter with same-origin server checks, selectable sample profiles, and shareable settings.
UUID & Hash Generator
Generate UUID v4 batches and compute text hashes with MD5 or SHA-256 for compatibility checks, fingerprints, and workflow automation.
QR Code Generator
Generate QR codes for links, text, email, call, SMS, Wi-Fi, events, vCards, and more with frame styles, custom colors, and downloadable PNG or SVG output.
CIDR Calculator
Calculate IPv4 CIDR subnet details from an IP address and prefix length, including network address, broadcast address, subnet mask, host range, usable hosts, and address classification.
Regex Tester
Test regular expressions in the browser with pattern flags, match detail, capture-group output, and replace preview.
JWT Decoder
Decode JWT header and payload segments in the browser, inspect issued and expiry timestamps, and review token claims without sending data to a server.
CSV to JSON Converter
Convert CSV rows into JSON objects with configurable delimiter handling and optional first-row headers directly in the browser.
JSON to CSV Converter
Convert JSON objects or arrays into CSV output with flattened nested keys and browser-side preview for simple data export workflows.
PNG to JPG Converter
Convert PNG images into JPG files in the browser with quality control and configurable background fill for transparent pixels.
WEBP Converter
Convert images between WEBP, PNG, and JPG in the browser with quality controls for lightweight image workflow adjustments.
Color Contrast Checker
Check foreground and background color contrast ratios against WCAG thresholds for normal and large text with live preview.
Color Converter
Convert color values between HEX, RGB, HSL, and OKLCH with synchronized output and a live swatch preview.
CSS Gradient Generator
Create linear CSS gradients with angle and color-stop control, live preview, and copyable background declarations.
Box Shadow Generator
Create CSS box shadows with offset, blur, spread, color, and opacity controls plus live preview and copyable output.