Free Home Improvement Tools & Calculators
Browse 117+ free interactive home improvement calculators, estimators, and utilities. 100% free, private, and runs directly in your browser without signup.
Pool Chlorine Calculator — Dose in ppm, Shock & Tablet Schedule
Pool chlorine calculator: dose liquid chlorine, bleach, cal-hypo, dichlor & trichlor by ppm, shock treatments, weekly tablet schedule and CYA warnings
Pool Heater Size Calculator — BTU, Heat-Up Time, Cost & Cover Savings
Free pool heater size calculator: BTU sizing, heat-up time, heat loss, gas vs heat pump cost, solar cover savings, sizing charts and install guidance.
Porch Size Calculator: Plan Front Porch Dimensions & Layout
Free porch size calculator: plan entry, seating, dining, wraparound and screened porch dimensions, door swing clearance and setback checks in one tool
Rain Barrel Size Calculator — Roof, Harvest, Diverter & Payback
Free rain barrel size calculator: size barrels from roof area and rainfall, plan monthly harvest, barrels needed, first-flush diverter, gutter and downspout check, garden usage and payback. 100% client-side.
Rebar Calculator — Quantity, Weight, Spacing & Cost Estimator
Estimate rebar for slabs, footings, columns and beams: bar counts, total linear feet, weight per foot (ASTM A615 table), lap splice length and cost. 100% client-side.
Retaining Wall Size Calculator — Blocks, Base, Drainage & Cost
Size a retaining wall: block and cap counts, base trench depth, gravel in tons, drainage pipe, geogrid layers for walls over 4 ft, and material cost.
Rug Size Calculator — What Size Rug for Living Room, Dining & Bedroom
Free rug size calculator: what size rug for your living room, dining room, bedroom & hallway. Standard-size picker, coverage check, pad sizer + cost.
Sand Calculator | Tons, Cubic Yards & Bags | nrtechstudio
Free sand calculator: estimate sand in cubic yards, tons, and bags for concrete, masonry, fill, play, paver base, and pool filter sand. Metric + imperial.
Sauna Size Calculator — Room, Heater kW, Bench, Stones & Vent Planner
Free sauna size calculator: plan room size by bathers, heater kW, bench depth, sauna stones, ventilation, door swing and safety checks — 7 planner mod
Septic Tank Size Calculator — Code-Based Sizing in Gallons & Litres | nrtechstudio.com
Septic tank size calculator: code-based sizing in gallons and litres from bedrooms or daily flow, plus dimensions, drain field area, and pump-out sche
Shower Cost Calculator
Shower cost calculator: per-shower water + energy cost by heater type (DOE EF), shower vs bath break-even, and shower remodel cost estimator.
Sideboard Size Calculator — Width, Height & Depth for Buffets | nrtechstudio.com
What size sideboard do I need? Free sideboard size calculator: width from your table or wall, height, depth and clearance checks — inches and cm.
Square Calculator — Square Footage & x² | nrtechstudio
Free square calculator: calculate square footage from length × width (ft, in, m), square any number x² with step-by-step work, multi-room totals, tile & flooring estimator with waste, and area unit conversions. 100% client-side.
Swamp Cooler Size Calculator — What CFM Does Your Home Need? | nrtechstudio.com
Swamp cooler size calculator: find the right CFM for your home or room with the 30 air-changes/hour rule, exhaust sizing, unit picker and climate chec
Tree Spacing Calculator: Trees per Acre & Hectare
Free tree spacing calculator: find trees per acre or hectare from spacing in feet or meters, square, rectangular, or triangular planting. Reverse mode, species presets, loss allowance, reference chart.
Tree Value Calculator — Amenity & Timber Value (Trunk Formula) | nrtechstudio
Free tree value calculator: estimate your tree
Treehouse Size Calculator — 7 Free Planning Tools | nrtechstudio
Free treehouse size calculator: tree DBH check, platform size, railing height, ladder angle, deck load, TAB anchor size and joist spans — 7 tools in o
Vanity Size Calculator — Single & Double Sink Widths, Height & Depth
Vanity size calculator: single and double sink widths, standard height and depth, IRC clearance checks, and mirror pairing — inches and centimeters, f
Voltage Regulation Calculator (%VR) — No-Load vs Full-Load | nrtechstudio
Free voltage regulation calculator: compute %VR = (V_no-load − V_full-load)/V_full-load × 100, solve the inverse (find V_full-load or V_no-load from %
Wallpaper Calculator — How Many Rolls Do You Need? | nrtechstudio.com
Free wallpaper calculator with pattern-repeat math: strips per roll, straight vs half-drop match, window/door deduction, wall diagram, single vs double roll cost. Metric + imperial.
Water Demand Calculator — Household & Irrigation Water Use (Free)
Free water demand calculator: estimate your household
Wind Chill Calculator
Wind chill calculator: official NWS 2001 formula, frostbite-time chart, metric mode and reverse mode. Free feels-like temperature tool.
Appliance Repair Cost Calculator
Appliance repair cost calculator: parts + labor estimates by appliance and fault, service-call fee math, the 50% repair-vs-replace rule, and a quote checker.
Asphalt Driveway Cost Calculator — New Install Estimator
Asphalt driveway cost calculator: price a new install by size, thickness, base prep, soil & region. Cost per sq ft, DIY vs pro, lifespan & asphalt vs concrete.
Basement Foundation Cost Calculator
Basement foundation cost calculator: price a new foundation by size, wall type (poured, block, ICF, stone), depth, waterproofing, drainage & state.
Basement Waterproofing Cost Calculator
Basement waterproofing cost calculator: interior drain tile, exterior excavation, crack injection & coating - with sump pump, dehumidifier & state pricing.
Cabinet Refacing Cost Calculator
Cabinet refacing cost calculator: per-door pricing by material tier — laminate, thermofoil, or veneer — plus a reface-vs-replace check and ROI estimate.
Chimney Cleaning Cost Calculator
Chimney cleaning cost calculator: estimate sweep, deep-clean & inspection costs by creosote level, flue type, chimney height & state labor. 12 FAQs.
Chimney Repair Cost Calculator
Chimney repair cost calculator: estimate 7 repair types — tuckpointing, crown, flue liner, cap & rebuild — by material, height, damage & state labor. 12 FAQs.
Concrete Driveway Cost Calculator — Price, Volume & DIY vs Pro Estimator
Concrete driveway cost calculator: estimate poured-concrete driveway cost by size, thickness, PSI, finish & region. Volume in cubic yards + DIY vs pro.
Concrete Removal Cost Calculator — Demolition, Disposal & DIY vs Pro Estimator
Estimate concrete removal cost by square foot, thickness and method. Jackhammer, excavator and saw-cut pricing, disposal tonnage math, haul-away and DIY vs pro.
Concrete Slab Cost Calculator: Slab, Patio & Pad Price
Estimate the cost to pour a concrete slab: patio, pad & slab prices with labor, site prep, reinforcement & finishes. DIY vs pro comparison. 2026 US prices.
Countersink Depth Calculator - Screw Head Depth for 82 and 90 deg
Countersink depth calculator: D=(OD-ID)/(2*tan(theta/2)). Metric M3-M10 & imperial #4-1/2 screw tables, 60-120 deg angles, truncated-tool mode, depth stops.
Countertop Cost Calculator — Quartz, Granite & Marble Price Estimator
Free countertop cost calculator: estimate quartz, granite, marble and laminate countertop prices per square foot, compare materials, and plan slab counts.
Deck Cost Calculator — Estimate Your Deck Build Cost (2026)
Deck cost calculator: estimate the cost to build a deck in 2026 by size, material & style. DIY vs pro pricing, railings, stairs, permits, ROI & timeline.
Driveway Resurfacing Cost Calculator 2026 — $/Sq Ft Guide
Driveway resurfacing cost 2026: asphalt overlay $3–$7/sq ft, sealcoat, or concrete overlay by sq ft, condition & region. Vs replacement, DIY & yearly cost.
Drywall Repair Cost Calculator
Drywall repair cost calculator: estimate by patch size, texture match, paint and region. Minimum-charge logic, multi-patch discounts, DIY-vs-pro gate, 12 FAQs.
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.
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.
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.
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.
Gutter Installation Cost Calculator
Gutter installation cost calculator: estimate new & replacement gutter cost by material, linear feet, stories, downspouts, guards & fascia repair. 2026 pricing.
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.
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.
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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.