One app instead of twelve. All-in-1 Converter Calculator gives you 42 genuinely useful tools — converters, calculators, measuring instruments and code references — and almost all of them work with no internet at all.
No account. No sign-up. Open it, get your answer, get on with your day.
WHAT YOU ACTUALLY GET
UNIT CONVERTER, 34 CATEGORIES
Free: length, weight, volume, area, temperature, speed, pressure, time, energy, power, angle, torque, cooking, fuel economy, data storage, resolution, number bases and food calories.
Pro adds 13 specialist engineering categories, including voltage, current, resistance, frequency, force, density and data rate.
Kilograms to pounds. Meters to feet. Celsius to fahrenheit. Liters to gallons. Kilometers to miles. Centimeters to inches. Metric to imperial and straight back again, without the mental arithmetic.
LIVE CURRENCY RATES
160+ currencies, refreshed daily and cached so they keep working when your signal does not. Free for everyone, and not hidden behind a purchase.
MONEY
Tip calculator and bill splitter. Loan and mortgage payments with interest. Sales tax. Discounts and sale prices. Unit price, so you can tell which package is genuinely cheaper. Percentages. Fuel cost for a trip. Electricity bill and energy use in kilowatt hours.
MEASURING TOOLS
An on-screen ruler in centimetres and inches. A protractor and angle finder. A bubble level for shelves, frames and appliances. A digital compass. And a feet-and-inches calculator that adds fractional imperial measurements the way a tape measure actually reads them.
ELECTRONICS
Resistor colour codes. Capacitor codes. Inductor colour codes. Wire size charts in AWG and SWG. Metric prefix and flow rate converters. All free.
SCIENCE AND STUDY
A full scientific calculator. The periodic table with atomic weights and element properties. GPA for semester and cumulative grades. Age and date calculators.
EVERYDAY UTILITIES
Barcode and QR scanner. QR code generator. Password generator. Text tools for case conversion, word and character counts, whitespace trimming, reversal and binary. Screen flashlight. Battery status. World clock and time zone converter. Hex to RGB colour conversion.
SIZES
Clothing, shoes, rings and hats across US, UK and EU standards.
HEALTH
BMI and body fat, with the measurements explained rather than just scored.
BUILT TO BE FAST
Every tool opens instantly. One search box finds any of the 42. Pin the ones you use to the top. Your history remembers what you already worked out, so you never redo a calculation you have already done once.
WORKS WHERE YOU WORK
Most tools need no connection at all — which matters on a jobsite, in a basement, on a plane, or anywhere the signal gives up. A dark interface designed to be read at a glance, with proper contrast, large touch targets and full VoiceOver support.
WHY 42 AND NOT 200
Every tool here is one somebody actually asked for, and every one of them is finished. There are no half-built screens, no dead menu entries, and nothing that opens to a placeholder. If it is in the list, it works.
WHO USES IT
Students converting units for homework and tracking a GPA. Electricians checking wire gauge and reading resistor bands. Tradespeople measuring, levelling and estimating on site. Travellers comparing shoe sizes and currencies. Cooks scaling recipes. Anyone whose home screen has quietly filled up with single-purpose apps.
FREE, WITH ONE OPTIONAL PURCHASE
All 42 tools are free — the scanner, every calculator, every measuring instrument, and live currency rates. One optional purchase removes ads permanently and unlocks 13 specialist engineering converter categories. It is not a subscription: it never renews, and you are never billed again.
PRIVACY
No account and no sign-up. Nothing personal is collected to use a tool. Your favourites, history and settings live on your device and stay there.
Download All-in-1 Converter Calculator and finally delete the other eleven.
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