Free Music Tools & Calculators
Browse 11+ free interactive music calculators, estimators, and utilities. 100% free, private, and runs directly in your browser without signup.
Berg Balance Test Calculator — 14-Item Score 0–56 & Fall-Risk Category | nrtechstudio.com
Free Berg Balance Scale calculator: score all 14 balance items (0–4 each, total 0–56), get the fall-risk category with per-item instructions, and copy
BIMS Calculator — Brief Interview for Mental Status Score (MDS 3.0) | nrtechstudio.com
Free BIMS calculator: score the Brief Interview for Mental Status (CMS MDS 3.0 Section C) — repetition, temporal orientation, recall — total 0-15 with
Braden Score Calculator — Pressure Ulcer Risk
Free Braden Scale calculator: score 6 subscales (sensory perception, moisture, activity, mobility, nutrition, friction & shear) to estimate pressure injury risk. Score 6–23 with risk interpretation. Educational tool, not a substitute for clinical assessment.
CD Calculator (Certificate of Deposit): Yield, Penalties & Ladder
Free CD calculator: compute certificate of deposit maturity value, early withdrawal penalties, compare 2 CDs, and build a 3/6/9/12-month CD ladder. 100% in the browser.
Fatigue Severity Scale (FSS) Calculator: 9-Item Fatigue Score | nrtechstudio.com
Free Fatigue Severity Scale (FSS) calculator (Krupp et al. 1989): answer the 9 items rated 1-7, get your total, mean score, per-item breakdown, and th
Glasgow Coma Scale (GCS) Calculator — E/V/M Scoring, Severity Bands & Paediatric Variant | nrtechstudio
Free Glasgow Coma Scale calculator (Teasdale & Jennett 1974): interactive E1–4 / V1–5 / M1–6 scorer with total 3–15, mild/moderate/severe bands, i
Maturity Value Calculator — Deposits, Bonds
Compute maturity value of deposits, bonds, and debt notes: simple interest, compound interest, a 2-instrument comparison, and a principal/rate solver. Free, no signup.
Morse Fall Scale Calculator — MFS Score & Fall Risk Band | nrtechstudio.com
Interactive Morse Fall Scale (MFS) calculator: score the 6 validated items (0-125 points), get the fall-risk band (low / moderate / high) and general
NIH Stroke Scale (NIHSS) Calculator — 15-Item Scorer, 0–42 Severity Bands & UN Handling | nrtechstudio
Free NIH Stroke Scale calculator (NINDS, Brott & Adams 1989): interactive 15-item NIHSS scorer with examination instructions per item, total 0–42,
Chord Progression Chart - Every Key, Transposable
Chord progression chart for all 24 keys: every diatonic chord, progressions that transpose automatically, plus guitar & piano diagrams with audio playback.
Piano Chord Finder - Interactive Piano Chord Chart with Sound
Free interactive piano chord finder: pick any root + chord type to see notes, intervals, inversions and voicings on a playable piano keyboard with sound.
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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.