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.
Epoxy Floor Calculator
Free epoxy floor calculator: how many gallons your garage floor needs by coating system, coats and thickness, plus flake, kit sizing and DIY vs pro cost.
Feet and Inches Calculator: Add, Subtract, Multiply and Divide
Free feet and inches calculator. Add, subtract, multiply and divide measurements in ft'in
Fence Cost Calculator: Price Per Foot by Material (2026)
Free fence cost calculator for 2026: price per linear foot by material — wood, vinyl, chain link, composite — with gates, terrain, removal & DIY vs pro.
FICA Tax Calculator
FICA tax calculator 2026: Social Security 6.2% on the first $184,500 of wages, Medicare 1.45% with no cap, the 0.9% surtax, and self-employment tax.
Financial Advisor Cost Calculator
How much does a financial advisor cost in 2026? Compare AUM, tiered, flat-fee, hourly and robo pricing — plus the true 20-year cost of a 1% fee.
Fireplace Installation Cost Calculator
Fireplace installation cost calculator: price gas, wood, electric, pellet and insert installs with venting and finish adders. Compare 5-year operating costs.
Fitness Planner
Free planner for fitness: pick your goal, days, level and equipment to build a weekly workout schedule with sets, reps, 8-week progression and tracker.
Tool - Flash Guide Number Calculator
Flash guide number calculator: max flash distance, required aperture & effective GN with ISO scaling, bounce loss, zoom head and power ratio.
Floor Area Ratio (FAR) Calculator
Free floor area ratio calculator: solve FAR from floor area, find max buildable area from zoning FAR, or plan footprint x floors. Sq ft, sq m, acres.
Foundation Repair Cost Calculator
Foundation repair cost calculator: push & helical pier, wall anchor, carbon strap, crack injection & slab lifting. Engineer, permit & state pricing.
Framing Calculator — Wall Stud & Lumber Takeoff
Wall framing calculator: count studs, plates, headers, cripples and sheathing for any wall at 16 or 24 in. on center. Projects, openings and cost.
French Drain Installation Cost Calculator
Estimate french drain installation cost in 2026: interior vs exterior rates per linear foot, depth and soil adders, sump pump, permit and DIY vs pro comparison.
Funeral Cost Calculator
Funeral cost calculator: itemized burial vs cremation costs, cemetery add-ons, VA burial benefits, FTC Funeral Rule rights & inflation projector. Free.
Furnace Repair Cost Calculator - 2026 Prices by Part
Estimate furnace repair cost for 2026 by symptom and part: ignitor, flame sensor, blower motor and heat exchanger prices, emergency fees and the $5,000 rule.
Furnace Replacement Cost Calculator - 2026 Installed Prices
Free furnace replacement cost calculator: 2026 installed prices by AFUE tier, BTU size, fuel type and region, plus lifetime fuel cost and 80%→96% payback.
Garage Door Cost Calculator
Garage door cost calculator: estimate replacement cost by material, size, insulation, type & opener. Steel, wood, aluminum prices, DIY vs pro, ROI data. Free.
Garbage Bag Size Calculator
Find the right garbage bag size for any trash can. Enter bin dimensions or gallons to get the bag size, flat dimensions, mil thickness, and style to buy.
GMAT Score Calculator (Focus Edition) — Total, Percentiles & Target Planner
Free GMAT Focus score calculator: estimate your 205–805 total from section scores, look up official percentiles, plan target scores, and compare Focus vs Classic. 100% client-side.
Gothic Font Generator - 12 Blackletter Styles Copy Paste
Convert text into 12 gothic blackletter styles — classic Fraktur, bold Fraktur, Old English, decorated seals and more. Copy & paste anywhere. Free, no signup.
Grocery Budget Calculator — USDA Monthly Food Budget Planner
Grocery budget calculator with USDA food plan costs (Aug 2026): monthly budget by household size and age, spending tracker, what-if scenarios. 100% in-browser.
Ground Sample Distance Calculator — Drone GSD, Footprint & Flight Planner
Free drone GSD calculator: compute ground sample distance from sensor, focal length and altitude, reverse max flight height, photo footprint and overlap flight planner. DJI presets included.
Gutter Installation Cost Calculator
Gutter installation cost calculator: estimate new & replacement gutter cost by material, linear feet, stories, downspouts, guards & fascia repair. 2026 pricing.
Hair Transplant Cost Calculator
Free hair transplant cost calculator: graft estimate by Norwood stage, FUE/FUT/DHI prices in the US, UK, Turkey and India, plus an all-in medical-tourism total.
Ham Cooking Time Calculator
Ham cooking time calculator: spiral, pre-cooked, raw and country ham minutes-per-pound at 325°F, USDA 140°F/145°F targets, glaze timing, rest & slow-cooker.
Standalone - hardwood-floor-refinishing-cost-calculator */
Estimate hardwood floor refinishing cost by method, species, finish and region. Compare DIY vs pro sanding, staining, recoating against new-floor replacement.
Head Gasket Repair Cost Calculator
Head gasket repair cost calculator: blown head gasket replacement by engine (I4 vs V6/V8), machining add-on, symptom checker and repair-vs-replace gate.
Hearing Aid Cost Calculator
Hearing aid cost calculator: price by tech level, style (BTE/RIC/ITE/CIC), OTC vs prescription, bundled vs unbundled, insurance, and 5-year total cost.
Home Addition Cost Calculator
Home addition cost calculator: cost per sq ft for bedroom, bathroom, kitchen, bump-out, sunroom, garage & second-story additions. Permits, ROI & financing.
Home Inspection Cost Calculator
Estimate home inspection cost by square footage, age, foundation and add-ons (radon, termite, sewer scope). Free calculator using 2026 published pricing data.
Honeymoon Cost Calculator
Free honeymoon cost calculator: estimate Bali, Maldives, Caribbean, Hawaii and Europe costs by tier, compare all-inclusive vs a la carte, and plan your savings.
Hot Tub Chemical Calculator
Hot tub chemical calculator: exact dichlor, bromine, pH, alkalinity and calcium doses for your spa volume, plus shock dosing and a weekly maintenance schedule.
Hot Tub Cost Calculator
Hot tub cost calculator: estimate tub price by type and seats, 220V electrical, concrete pad, delivery or crane, plus monthly energy, chemical and water costs.
Income Percentile Calculator - Where Do You Rank? (2024 Data)
Free income percentile calculator: rank your income vs 2024 Census household data and BLS full-time earnings - by age, gender, education. Top-1% finder, charts.
Intermittent Fasting Calculator — Schedule, Eating Window & Fasting Timeline
Intermittent fasting calculator: plan 16:8, 18:6, 20:4, OMAD, 5:2 or ADF. Get your exact eating window, a fasting stages timeline and a weekly plan.
Jeans Size Converter
Convert jeans sizes between US, UK, EU, IT and JP. Enter any size or waist measurement to get every equivalent, plus the right inseam for your height.
Kitchen Remodel Cost Calculator
Kitchen remodel cost calculator: estimate renovation cost by sq ft, tier & scope. Category breakdown, resale ROI & budget planner. Free, no signup.
Knee Replacement Cost Calculator (standalone) */
Estimate knee replacement costs for 2026 by procedure type, facility and region — with insurance, Medicare and cash-pay out-of-pocket math plus rehab estimates.
Ladder Angle Calculator
Free ladder angle calculator: OSHA 4:1 safe-angle checker, ideal base distance, ladder length with the 3 ft landing rule, and a setup safety checker.
Lamb Cook Time Calculator
Lamb cook time calculator: leg, shoulder, rack, loin, chops, shank and ground lamb times per pound, USDA 145°F temps, rest rules and serve-time planner.
Landscaping Cost Calculator
Landscaping cost calculator: estimate your yard project budget by feature, tier & region — DIY vs pro, cost per sq ft, phasing plan, and annual maintenance.
Laser Hair Removal Cost Calculator
Free laser hair removal cost calculator: per-session prices by body area, sessions needed, package vs pay-per-session break-even, and 10-year cost vs waxing.
LASIK Cost Calculator
LASIK cost calculator: estimate LASIK, PRK, SMILE & custom LASIK prices per eye and total, with financing math and lifetime break-even vs glasses and contacts.
Lens Magnification Calculator
Lens magnification calculator: reproduction ratio, extension tube & close-up diopter estimators, field of view on full-frame, APS-C and MFT sensors.
Lip Filler Cost Calculator
Free lip filler cost calculator: estimate per-syringe price by product, provider and region, project annual maintenance, and compare lip flip vs filler costs.
Liposuction Cost Calculator
Free liposuction cost calculator: per-area prices by technique, anesthesia and facility fees, multi-area discounts, financing payments, and recovery estimates.
Lobster Cook Time Calculator — Boil, Steam, Grill & Doneness
How long to cook lobster by weight: exact boil, steam and grill times for 1–3 lb whole lobsters and tails, 140°F doneness check, thawing guide, and a full time chart.
Locksmith Cost Calculator — How Much Does a Locksmith Charge?
Locksmith cost calculator: estimate lockout, rekey, lock replacement, key extraction and smart lock install prices by service, time of day and region.
LSAC GPA Calculator (Official 4.33 Scale)
LSAC GPA calculator using the official LSAC 4.33 conversion scale (A+ = 4.33). Handles retakes, W vs WF, and LSAC counting rules. Free, 100% client-side.
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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.