Free Online Tools for Everything You Do
Browse 2,706+ free interactive tools - home improvement estimators, pet calculators, cooking converters, automotive tools, finance planners, fitness calculators, developer utilities and more. No sign-up. 100% private. Runs entirely in your browser.
Water Heater Installation Cost Calculator
Water heater installation cost calculator: 2026 prices for tank, tankless and heat pump units, venting and gas-line adders, permit costs and 10-year TCO.
Water Softener Cost Calculator
Water softener cost calculator: purchase price by system type and grain capacity, pro vs DIY install, salt and operating costs, 10-year TCO, rental vs buy.
Wedding Cake Cost Calculator: Price by Serving & Tier
Estimate wedding cake cost by servings, tiers and fondant vs buttercream. Includes delivery, cutting fees and a bakery vs grocery vs DIY per-serving comparison.
Tool - Wedding Photographer Cost Calculator
Estimate wedding photographer costs by hours, tier, second shooter, albums and videography bundles. Free US calculator with 2026 market ranges and examples.
Wedding RSVP Tracker
Free wedding RSVP tracker: build your guest list, track every RSVP, project final attendance, and tally meal choices. 100% private, runs in your browser.
Weekly Planner — Free Online Weekly & Daily Planner
Free interactive weekly planner with time blocking: 7-day grid, daily planner view, routine templates, planned-vs-actual weekly review. No signup — data stays in your browser.
Weighted Average Calculator
Free weighted average calculator: value-weight list, weighted vs simple comparator, reverse solver, grade use-case.
Well Pump Replacement Cost Calculator: 2026 Price Guide
Well pump replacement cost calculator (2026): price submersible, jet and constant-pressure pumps by depth, HP, pipe, wire and tank, with 10-year operating cost.
Wheel Alignment Cost Calculator
Wheel alignment cost calculator: 2-wheel vs 4-wheel alignment price by vehicle class, dealer vs independent shop, ADAS add-on, and lifetime package break-even.
Whole House Generator Cost Calculator
Whole-house generator cost calculator: size your kW, estimate installed price with transfer switch, gas line, permits, labor and maintenance. 2026 data.
Will Cost Calculator
How much does a will cost in 2026? Compare online will services ($50-$200) vs attorney flat fees ($300-$800) vs trust plans. Free estimate calculator.
Window Replacement Cost Calculator
Free window replacement cost calculator: estimate per-window and total cost by type, material & install method, plus energy savings and quote compare.
Window Tint Cost Calculator
Window tint cost calculator: dyed, carbon, ceramic, crystalline prices by vehicle, per-window builder, removal fees, DIY vs pro, 50-state VLT checker.
Windshield Replacement Cost Calculator
Windshield replacement cost calculator: OEM vs aftermarket glass, ADAS calibration ($250–$500), mobile, repair vs replace rules, insurance deductible guide.
Wisdom Tooth Removal Cost Calculator
Wisdom tooth removal cost calculator: estimate per-tooth prices by impaction tier, sedation, all-four bundles & PPO insurance coverage. Free 2026 planner.
Wood Beam Span Calculator — IRC Floor-Joist Span Tables
Free wood beam span calculator from IRC 2012 tables: max floor-joist span by species, size, spacing and load. Preliminary planning only.
301 Redirect Generator - Bulk .htaccess, Nginx, IIS, Cloudflare & Netlify Rules
Free 301 redirect generator: paste URL pairs, get ready-to-deploy rules for Apache, Nginx, IIS, Cloudflare, Netlify, or CSV — plus a chain validator.
AutoSAST — Free SAST & Code Security Scanner | NR Tech Studio
Free online SAST code security scanner. Audit ZIP archives & GitHub repos for OWASP Top 10:2021 flaws using Semgrep AST and instant AI fix patches.
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How to Use the Tools Directory
Every tool is a single interactive page: enter your inputs, get instant results, no account needed. Use the search box (shortcut: press /) to jump straight to a tool, or browse categories when you are exploring. Each card links to the tool's permanent URL, which you can bookmark or share.
Because all computation happens in your browser, the tools are fast, private, and free forever. If a result looks wrong, use the one-click report control on the tool page so it can be fixed.
Tool Categories at a Glance
| Category | What you will find | Example tasks |
|---|---|---|
| Developer | Encoders, formatters, regex, network tools | Format JSON, test regex, subnet a network |
| Finance | Tax, loans, salary, investing | Estimate tax brackets, amortize a loan |
| Home improvement | Estimators, measurements, materials | Size a wire, estimate paint or flooring |
| Health & fitness | Body metrics, nutrition, workouts | Track BMI, plan calories, score fitness tests |
| Math & science | Converters, geometry, statistics | Convert units, solve triangles |
| Text | Counters, sorters, generators | Count words, alphabetize a list |
| Color | Pickers, converters, checkers | Convert HEX to RGB, check contrast |
| Everyday life | Cooking, travel, automotive, pets | Convert recipes, plan fuel costs |
Popular Tasks and Where to Start
| I want to... | Start with | Why |
|---|---|---|
| Convert between number bases | Binary Converter | Step-by-step base conversion with charts |
| Validate and format data | JSON Formatter | Pretty-print and check JSON instantly |
| Count words for an essay | Word Counter | Words, characters, reading time |
| Check password strength | Password Strength Meter | Entropy-based strength scoring |
| Grade text readability | Readability Score | Flesch-Kincaid and grade levels |
| Audit color contrast | Accessibility Checker | WCAG contrast ratios in one click |
Tools Directory FAQ
What is the NRTechStudio tools directory?
It is a free catalog of more than 2,700 interactive web tools: calculators, converters, generators, and checkers for developers, finance, home improvement, health, education, and everyday tasks.
Are all the tools really free?
Yes. Every tool in the directory is free to use with no sign-up, no trial, and no paywall. They run entirely in your browser.
Do I need to create an account?
No. There are no accounts, logins, or subscriptions. Open a tool and use it immediately.
Is my data private when I use these tools?
Yes. The tools are 100% client-side: your inputs are processed by JavaScript in your own browser and never sent to a server.
How do I find the right tool?
Use the search box at the top of the directory (press / to focus it), or browse by category. Every tool card shows a short description of what it computes.
Do the tools work on mobile?
Yes. The directory and the tools use responsive layouts that adapt to phones, tablets, and desktops.
How many tools are there?
The directory holds more than 2,700 tools and grows regularly as new calculators and converters are published.
Can I request a new tool?
Yes. Each tool page has a report/feedback control you can use to request features or new tools; requests help prioritize what gets built next.
Are the tools accurate?
Calculators use published formulas and reference data (tax tables, NEC ampacity, standard conversions). Each tool page documents its method, and issues can be reported in one click for a fix.
Do tools work offline?
Once a tool page has loaded, most tools keep working without a connection because the logic is client-side JavaScript. The directory search needs the page loaded first.
What categories are covered?
Developer utilities, finance and tax, home improvement, health and fitness, math and science, text tools, color tools, networking, education, and everyday life calculators, among others.
Can I bookmark or share a tool?
Yes. Every tool has its own permanent URL under nrtechstudio.com/tools/, which you can bookmark or share directly.
Is there an API for these tools?
The tools are interactive web pages, not API endpoints. The underlying math is plain JavaScript you can inspect in the page source.
Why do some tools show ratings?
Ratings aggregate user feedback to surface the most trusted tools and flag pages that need fixes or better explanations.
How often are new tools added?
New tools are published on a continuous pipeline, prioritized by measured search demand and by user requests from the feedback controls.
Who builds these tools?
NRTechStudio, an independent tools studio focused on free, private, client-side utilities that respect user privacy.