Unitly: Unit Converter

Unitly is a fast, precise unit converter that works completely offline. Pick a category, type a value and read the answer instantly, with the conversion factor shown both ways so you can check it at a glance.

WHAT IT CONVERTS
21 categories and more than 230 units: length, mass, temperature, volume, area, speed, time, digital storage, pressure, energy, power, angle, frequency, fuel economy, cooking measures, force, density, data rate, torque, running pace and counting units (pair, dozen, score, gross, ream). Metric, imperial and US units are grouped so the one you need is easy to find, and a search box finds any unit by name or symbol (psi, acre, GiB, knot...).

QUICK ANSWERS
Type a question such as "12 ft to m", "100 f in c" or "2.5 cups to ml" into the search box and the answer appears right away. Tap it to open the full converter.

BUILT FOR QUICK, EXACT ANSWERS
- Two-field converter with a one-tap swap
- All-units view: see one value in every unit of the category, tap a row to copy it
- Type simple arithmetic right in the input, like 12 × (3.5 + 1), and convert the result. The calculator is a strict parser, so only numbers and + − × ÷ ^ ( ) are accepted
- Results also read the way people say them: 5 ft 10 3/4 in, 11 lb 4.3 oz, 1 h 30 min, 12° 30′ 15″, 5:27 per km, 1 1/3 cup, 4 dozen 2 pieces. Tap the reading to copy it
- Precision setting: automatic (up to 10 significant digits) or a fixed 0 to 9 decimal places
- Number format of your choice: 1,234.5 / 1.234,5 / 1 234.5 / 1234.5
- Formulas shown for temperature (for example °F = °C × 1.8 + 32) and reciprocal units such as L/100 km and mpg

A SLIDE RULE YOU CAN DRAG
Under every conversion sits a live slide rule. The two scales are aligned so every pair of marks is a valid conversion. Drag it sideways to scrub through values and watch both scales move. Reciprocal pairs such as fuel economy and running pace run backwards, the way an inverted scale does.

COOKING THAT KNOWS THE INGREDIENT
Convert cups, tablespoons and teaspoons (US and metric) to grams and ounces using typical densities for flour, sugar, butter, milk, honey, rice, oats and more. Results are clearly marked as approximate.

FAVORITES AND HISTORY
Star the pairs you use most and they sit on the home screen. Recent conversions are saved automatically and grouped by day. Filter the history by category, and swipe a row to delete it (with undo). Each category remembers the units and value you used last.

OPTIONAL PREMIUM
Optional Premium (one-time purchase, no subscription): no ads at all; 17 professional categories (flow rate, mass flow, acceleration, viscosity, electric charge and battery capacity, current, voltage, resistance, capacitance, inductance, EV efficiency, radio wavelength and photon energy, space distance and mass, typography, screen resolution); a currency converter for 24 currencies that uses the rates you type in, so it still works offline and never fetches anything; your own units in any category; Blueprint, Graphite and Engineer's pad themes, including two dark themes; unlimited history with CSV export.

PRIVATE AND OFFLINE
No account and no internet connection needed for any conversion. Your favorites, history, rates and settings stay on your device.

ADS
Unitly is free and ad-supported. It shows a small banner and, occasionally, a full-screen ad when you return to the home screen after several conversions, never while you are typing. If you prefer, watch one short video to pause full-screen ads for 24 hours, or remove all ads with Premium.

Available in English and Indonesian.