Is I Smart Measure free to use?

Yes. I Smart Measure is completely free with no account, no sign-up, no ads and no tracking. Every tool is unlocked from the first visit and runs entirely in your browser.

What can I do with I Smart Measure?

Convert 100+ units across 13 families, scale recipes between US/UK/metric, estimate room area and material cost, calculate BMI, calories and body measurements, run loan, paycheck, sales-tax, tip and savings calculators, build invoices and receipts, generate barcodes and QR codes, convert currencies and the top 1,000 cryptocurrencies at live rates, and use a scientific calculator and cited unit library.

Does it work offline?

Yes. After the first load, conversions, recipes, square footage, body & health, finance, invoices, receipts, barcodes, QR generation and the calculator all run locally with no connection. Only live currency, crypto and market rates and the optional image scanners need the internet, and they fall back to the last saved snapshot offline.

Yes. There are no servers, no accounts, no analytics and no advertising. Your preferences, favorites and history are stored only in your browser's local storage on your own device, and nothing you enter is transmitted.

How accurate are the conversions?

Every value is held internally in SI base units using factors from NIST SP 811 and the BIPM SI Brochure, then rounded to your chosen precision of 2 to 9 significant digits. Many factors are exact by definition, such as 1 inch = 2.54 cm and 1 pound = 0.45359237 kg.

How do I switch between US, UK and Metric?

Use the US / UK / Metric toggle in the top bar, or set a default in Settings. The whole app re-renders results in the chosen system, including recipes, square footage and body measurements.

Why do US and UK units differ for the same name?

Several units share a name but not a size: the US gallon is 3.785 L while the UK/imperial gallon is 4.546 L, and US and imperial fluid ounces, pints, quarts and tons differ. I Smart Measure keeps them distinct so a conversion is never silently wrong.

What does Recipe Mode do?

It scales a whole recipe at once and converts every ingredient between US, UK and metric measures, flagging cup and pint differences (a US cup is 237 mL, a metric cup is 250 mL, and a UK pint is about 20% larger than a US pint).

What can the Finance tools calculate?

Loan, home loan, car loan, paycheck (gross to net), sales tax, tip with split, and a savings forecast, each itemized on a printable receipt in dollars, pounds or euros. Figures are estimates; confirm exact terms with your lender or tax authority.

Can I create invoices and receipts?

Yes. The Invoice tool builds a professional invoice with logo, line items, tax, discount, deposit, Quote/Estimate/Invoice types, a PAID stamp, a scan-to-pay QR and PDF export. The Receipt tool builds an itemized cash receipt with tax, discount, tip, total and change due.

Which barcode and QR formats are supported?

Barcodes: Code 128, GS1-128, EAN-13, UPC-A, EAN-8, Code 39, Code 93 and ITF, with check-digit validation, batch sheets and PNG/SVG export. QR codes: 11 content types with themes, dot shapes, gradients, a custom eye color, transparent background and a center logo.

How many cryptocurrencies can I browse?

The Crypto Directory loads the live top 1,000 coins by market cap with official logos, price and 24h change. It shows the top 100 by default with a Show all 1,000 toggle, a search box spanning every coin, a Fear & Greed gauge, an ISO 20022 group and a by-blockchain breakdown. All 1,000 are also selectable in the converter.

What is in the Markets tab and how often does it update?

Live free-source data: gold, the global crypto market cap, 24h volume, BTC dominance, top gainers and losers, trending coins, USD forex pairs and the Fear & Greed index. Markets, Crypto and Currency auto-refresh on a timer you control (Off, 30 seconds, 1 minute or 5 minutes), or you can refresh manually.

What can I change in Settings?

Default measurement system, light or dark theme, display precision, thousands separators, reduce motion, default currency, live-rates auto-refresh interval, the default screen the app opens on, and a reset-all option that clears saved data after a confirmation.

Can I install it as an app?

Yes. I Smart Measure is a Progressive Web App. Use your browser's Install or Add to Home Screen option to launch it full-screen from your home screen or desktop, with offline support.

Is the app accessible?

It aims to meet WCAG 2.1 Level AA with keyboard navigation, visible focus rings, sufficient contrast, a light theme, a reduce-motion option and an accessibility options panel for text size, high contrast, readable font, underlined links, reduced transparency and a strong focus outline.

I Smart Measure

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16 tools · 1,000 live coins · stocks, gold & FX

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A fast, private measurement workspace. Convert across US, UK Imperial & Metric, then scale recipes, bill clients, price rooms, generate barcodes & QR codes, and track live markets — gold, FX and the top 1,000 cryptocurrencies, auto-refreshed. No ads, no tracking, works offline.

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Sixteen tools, one workspace

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From everyday unit conversion to invoices, barcodes, QR codes and live markets — every tool is fast, private and works offline.

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Switch between US Customary, UK Imperial and Metric (SI) — results re-render instantly, with cooking-measure pitfalls flagged.

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