Free General Utilities Tools & Calculators
Browse 95+ free interactive general utilities calculators, estimators, and utilities. 100% free, private, and runs directly in your browser without signup.
Liposuction Cost Calculator
Free liposuction cost calculator: per-area prices by technique, anesthesia and facility fees, multi-area discounts, financing payments, and recovery estimates.
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.
Standalone - magic-number
Calculate any team's magic number and tragic (elimination) number with the official formula. Multi-sport (MLB, NBA, NFL, NHL), wild-card race mode, post-2022 tiebreakers, and a clinch-scenario planner.
Margin of Error Calculator: Survey MOE, Sample Size & Confidence Interval
Free margin of error calculator for surveys and polls. Compute MOE from sample size, solve sample size for a target MOE, build confidence intervals, and apply finite population correction — with z-score table.
Metal Roofing Material Calculator — Panels & Takeoff
Free metal roofing material calculator: estimate panels, screws, clips, ridge caps, trim, closures and underlayment for standing-seam or exposed-fastener roofs.
Mini Split Installation Cost Calculator (2026 Prices)
Mini split installation cost calculator (2026): single & multi-zone prices by BTU, brand tier and region, with 10-year operating-cost comparison.
MRI Cost Calculator
MRI cost calculator: price MRI scans by body part, with vs without contrast, hospital vs imaging-center rates, insurance out-of-pocket, and cash-pay discounts.
Music Genre Finder — Find Your Music Genre by Artist or Mood
Free music genre finder: enter an artist, pick a mood, or explore 61 music genres with BPM ranges, signature instruments, example artists, and smart recommendations. No signup.
Nanny Cost Calculator
Free nanny cost calculator: hourly rate, overtime 1.5x, payroll taxes (FICA/FUTA), workers comp, PTO, agency fees and nanny-share savings - 2026 rates.
Paid Family Leave Calculator 2026 - State PFL Benefit Estimator
Free 2026 paid family leave calculator — estimate weekly benefits, max weeks and total payout across 14 state programs, plus eligibility check.
Partial Pressure Calculator
Free partial pressure calculator — Dalton's law: partial pressures from mole fractions or volume percent, reverse mole fractions, total pressure from partials.
NFL Passer Rating Calculator
Free NFL passer rating calculator with the official 4-component formula: enter completions, attempts, yards, TD and INT to get the 0-158.3 rating, full component breakdown, interpretation tiers, and the NCAA college rating.
Personal Trainer Cost Calculator
How much does a personal trainer cost in 2026? Free calculator: per-session rates by gym type, location, packages, monthly totals and cost comparisons.
PERT Calculator
Free PERT calculator for project management: three-point estimation, automatic critical path, slack analysis, network diagram and on-time probability.
Physical Therapy Cost Calculator — How Much Does PT Cost?
Physical therapy cost calculator: per-session rates by setting, copay and visit-cap math, cash-pay packages. Budget ACL, back pain, stroke rehab costs.
Plumber Cost Calculator
Plumber cost calculator: estimate hourly rates by license tier, flat-rate job prices, emergency surcharges, and check whether a plumbing quote is fair.
Popcorn Ceiling Removal Cost Calculator
Popcorn ceiling removal cost calculator: estimate per-sq-ft rates by method, ceiling height, painted texture & asbestos testing. Compare pro vs DIY costs fast.
Porta Potty Calculator — Event, OSHA Construction & Cost Estimator
Free porta potty calculator: event unit counts, OSHA 1926.51 construction rules with servicing plans, ADA and handwash guidance, and rental cost estimates.
Preschool Cost Calculator — Estimate Preschool Tuition by State & Program (2026)
Free preschool cost calculator: estimate tuition by state, program (public pre-K, private, Montessori, Head Start) & schedule. State data + affordability check.
Pressure Washing Cost Calculator
Free pressure washing cost calculator: estimate pro prices per square foot for driveways, siding, decks, roofs, brick and fences, with DIY vs pro comparison.
Private Chef Cost Calculator - Free Online Private Chef Price Estimator
Free private chef cost calculator: estimate dinner party, tasting menu and weekly meal-prep prices per person by city, courses and menu tier. 2026 data.
Radioactive Decay Calculator — Half-Life, Activity (Bq↔Ci) & Decay Constant
Free radioactive decay calculator: remaining nuclei N(t), half-life, decay constant, activity in Bq and Ci, reverse solvers, and an 18-isotope half-life table. 100% client-side.
Renters Insurance Cost Calculator
Free renters insurance cost calculator: estimate monthly and annual premiums by coverage, deductible, location, credit tier and discounts, with 3-plan compare.
Rewire House Cost Calculator
Rewire house cost calculator: full-house rewiring estimate by sq ft, wiring type, wall access, panel upgrade, and region. Breakdown + DIY vs pro. Free.
Rhinoplasty Cost Calculator 2026 — Nose Job Price Estimator
Rhinoplasty cost calculator 2026: estimate nose job prices by US region, surgeon tier, technique and anesthesia, with itemized breakdown and tourism comparison.
Rivet Size Selector
Free rivet size selector: enter material thickness for the right blind or solid rivet diameter, length, dash number, drill size and grip range.
Shiplap Calculator \u2014 How Much Shiplap Do I Need?
Free shiplap calculator: boards, lineal feet, waste, trim & cost for horizontal, vertical, or ceiling installs. Subtracts windows & doors. 100% free, no signup.
Skylight Installation Cost Calculator (2026 Prices)
Skylight installation cost calculator (2026): fixed, vented, solar & tubular prices by size, roof type, glazing and labor, itemized per-skylight estimate.
Song Finder — Find a Song by Humming, Lyrics, or Description
Can't name that tune? Hum it, type the lyrics you remember, or say where you heard it — our free song finder matches your melody and builds exact searches. No app, no upload, 100% in your browser.
Song Key Finder
Free song key finder: type a song's chords to estimate its musical key, Camelot code, relative keys, key signature and capo transpose. In-browser.
Subscription Cost Calculator - True Monthly & Yearly Cost (Free)
Free subscription cost calculator: true monthly and yearly cost of every subscription. Project price creep, model cancel savings, compare to household averages.
Tablecloth Size Calculator
Find the right tablecloth size for any table. Enter the table shape, dimensions and drop to get the exact size plus the nearest standard size.
Tattoo Cost Calculator — How Much Does a Tattoo Cost?
Tattoo cost calculator: estimate prices by size, style, color & placement. Sleeve, cover-up & small tattoo costs with tip and aftercare breakdowns.
Therapy Cost Calculator — How Much Does Therapy Cost?
Therapy cost calculator: estimate per-session rates, insurance copays, sliding-scale fees and online therapy prices. Compare 5 ways to pay and budget your year.
Timing Belt Replacement Cost Calculator
Timing belt replacement cost calculator: price belt-only vs full kit with water pump by vehicle class, dealer vs independent labor, and the cost of waiting.
Trip Planner
Free trip planner: build a day-by-day travel itinerary with activities, times, per-day costs, reorderable days, a packing checklist generator, and printable export. 100% client-side, no signup.
True Position Calculator
GD&T true position calculator: TP = 2×√(ΔX²+ΔY²) from basic and measured coordinates. Pass/fail vs tolerance, RFS/MMC/LMC bonus, batch CMM data, zone diagrams.
Tummy Tuck Cost Calculator
Free tummy tuck cost calculator: mini, full & extended abdominoplasty prices with muscle repair, financing payments, and recovery downtime planner.
Urgent Care Cost Calculator
Estimate urgent care visit costs by reason, add-ons, and region. Compare urgent care vs ER vs PCP vs telehealth vs retail clinic with insurance math.
Varicose Vein Treatment Cost Calculator 2026 — Estimate by Procedure & Insurance
Varicose vein treatment cost calculator 2026: estimate sclerotherapy, laser, RFA, VenaSeal, phlebectomy & stripping per leg, sessions, and insurance coverage.
Vertical Curve Calculator — Parabolic Crest & Sag Solver
Free vertical curve calculator: crest and sag parabolic solver with elevations, high/low point, K-value, AASHTO sight distance check and profile plot.
Water Damage Restoration Cost Calculator
Water damage restoration cost calculator: estimate cleanup cost per sq ft by category (Cat 1/2/3), materials, dry-out days and deductible. Free, instant.
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.
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.
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.
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.
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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.