Basic Calculator A clean browser calculator for quick arithmetic, percent checks, and copied results. Open Percentage Calculator Find percent-of answers, percent change, discounts, markups, and reverse percentages. Open Ratio Calculator Simplify ratios, scale matching ratios, and split totals by ratio parts. Open
Tool Categories
Browse the growing Access Free Tools library by task, then open the tool or guide that matches what you are trying to finish.
Start with the strongest hubs
These are the best entry points for common jobs: quick calculators, money estimates, health estimates, home projects, AI helpers, school work, and developer tasks.
Calculators 60 tools and 60 guides. Everyday math, finance, school, and measurement calculators. Finance 84 tools and 84 guides. Savings, budget, payment, interest, and comparison tools. Health & Fitness 33 tools and 33 guides. Simple wellness calculators with clear educational disclaimers. Home & Projects 47 tools and 47 guides. Material, room, yard, and building-project estimators for rough planning. AI Tools 10 tools and 10 guides. Browser-only AI helpers for text, images, OCR, summaries, and writing checks. School & Study 4 tools and 4 guides. Student-friendly tools for notes, math, timing, and planning. Developer Tools 16 tools and 16 guides. Encoding, formatting, JSON, URL, and productivity utilities. Free Calculator Resources A curated starting page for students, teachers, writers, and community links.
Browse by task
Categories keep the site readable as the library grows, with calculators, guides, and related utilities grouped together.
Calculators
Everyday math, finance, school, and measurement calculators.
ConvertersUnit, file, color, text, and measurement conversion tools.
Text ToolsWord counts, case changes, cleanups, and formatting helpers.
Date & TimeDate differences, time zones, countdowns, and scheduling helpers.
FinanceSavings, budget, payment, interest, and comparison tools.
Health & FitnessSimple wellness calculators with clear educational disclaimers.
Home & ProjectsMaterial, room, yard, and building-project estimators for rough planning.
Developer ToolsEncoding, formatting, JSON, URL, and productivity utilities.
Image ToolsSimple browser-based image helpers for daily creative tasks.
AI ToolsBrowser-only AI helpers for text, images, OCR, summaries, and writing checks.
School & StudyStudent-friendly tools for notes, math, timing, and planning.
Everyday ToolsQuick utilities for ordinary tasks, decisions, and checklists.
Guides where context matters
Some tools need extra explanation because the wrong input can change the result a lot. Start with the tool, then read the guide before using the number for a project or safety-related decision.
Watts to Amps Calculator Use watts, volts, phase type, and power factor to estimate current, with clear electrical safety limits. Watts to amps guide Read why voltage and phase can change the amps result before using the number around real equipment. Wallpaper Calculator Estimate wallpaper rolls from wall size, openings, roll coverage, pattern repeat, and waste percent. Wallpaper calculator guide Learn what waste percent, roll coverage, pattern repeat, and dye lots mean before buying rolls.
Category snapshot
Start with a major section, or jump into one of its most useful tools.
Conversion Calculator Convert length, mass, volume, and temperature units with clear formula steps. Open Roman Numeral Converter Convert numbers to Roman numerals and Roman numerals back to numbers. Open Shoe Size Conversion Convert foot length into approximate US men, US women, UK, and EU adult shoe sizes. Open
Word Counter Count words, characters, sentences, paragraphs, lines, and estimated reading time. Open Character Counter Count characters, words, lines, no-space text, and UTF-8 bytes. Open Text Case Converter Convert text to uppercase, lowercase, title case, sentence case, camelCase, snake_case, and kebab-case. Open
Age Calculator Calculate exact calendar age in years, months, days, and total days. Open Date Calculator Count days between dates or move a calendar date forward or backward. Open Time Calculator Add or subtract hours, minutes, and seconds with normalized H:M:S, total seconds, and decimal hours. Open
Mortgage Calculator Estimate monthly principal, interest, taxes, insurance, PMI, and HOA costs. Open Loan Calculator Estimate a fixed monthly loan payment, total paid, and total interest from amount, rate, and term. Open Auto Loan Calculator Estimate a car payment from vehicle price, tax, fees, down payment, trade-in, rate, and term. Open
Concrete Calculator Estimate slab volume, cubic yards, cubic meters, and common 40, 60, and 80 lb bag counts. Open Roofing Calculator Estimate roof squares and shingle bundles from footprint, pitch, and waste. Open Tile Calculator Estimate floor, wall, or shower tile count from square feet, tile size, and waste. Open
AI Token Cost Calculator Estimate AI model input, output, and total token cost from your own current price rates. Open Prompt Token Estimator Estimate prompt tokens from text length with a visible rough range and tokenizer warning. Open Image to Text OCR Tool Copy text from screenshots, labels, receipts, and clear document images without uploading the image. Open
GPA Calculator Estimate GPA from course credits and letter grades on a common 4.0 scale. Open Grade Calculator Find the final exam grade needed to reach a desired course grade. Open Molarity Calculator Calculate molarity from moles and liters, or from grams, molar mass, and final solution volume. Open