Basic ConversionSelect a category from the strip (Length, Area, Weight, etc.), enter a value in the From field, and choose your source and target units. The result updates instantly. Both fields are fully editable — type into either side and the other recalculates. Press Tab to jump between them.

ExpressionsType mixed-unit expressions directly into the From field: 5ft + 3in, 2m + 50cm, or simple maths like 2.5 * 12. The parser auto-detects units and switches category for you. Combine addition and subtraction freely.

Paste DetectionPaste text like 500mm or 12ft and the app detects the unit, switches to the correct category, sets the From dropdown, and shows a confirmation banner. Works with any recognised unit alias.

Live CurrencyThe Currency category fetches live exchange rates from the web. Rates are cached for 1 hour in your browser. If you're offline, a built-in fallback rate table is used. The statusbar shows when rates were last updated. 22 major currencies included.

FavouritesClick the ☆ button to pin any from→to conversion pair. Access all your pinned conversions from the Favourites tab. Click any favourite to jump straight to that conversion. Favourites persist between sessions.

HistoryEvery conversion is automatically logged when you press Enter or leave the input field. Open the History panel with the button in the top-right or Ctrl+H. Click any entry to restore it. Export your full history as a CSV file for documentation or sign-off.

Formula ModeSix built-in calculators: rectangle area, box volume, circle area, triangle area, concrete slab volume, and paint coverage. Each shows the primary result plus automatic conversions to related units underneath. Enter dimensions in metres.

Construction PresetsQuick-reference cards for construction professionals: common length and area conversions, rebar weights per metre (T10–T32), brickwork counts per m², material densities, and pressure conversions. Click any card with a conversion value to load it directly into the converter.

Unit-Aware NotepadA scratchpad where each line is an independent conversion. Use the → arrow to specify a target unit: 5ft + 3in → m, 100kg → lb, 2400 * 0.15m3 → L. Results resolve live in a table below the editor. Great for working through multiple calculations at once.

Comparison ModeClick the ⊞ button between Favourite and Swap to toggle a card grid. Shows your input value converted to every unit in the current category simultaneously. Click any card to set it as the target unit. Useful for quickly scanning across units.

ThemeToggle between dark and light themes using the moon/sun button in the top-right corner. Your preference is saved between sessions. The dark theme matches the BIM Explorer design language.

All Conversions Table & Bar ChartBelow the result, a live view shows the input converted to every unit in the category. Toggle between table and bar chart views using the ☰/▥ buttons. The bar chart uses logarithmic scaling when values span many orders of magnitude. Click any row or bar to set it as the target unit.

Scale GaugeA logarithmic scale bar appears below the converter showing where your current value sits relative to the smallest and largest units in the category. Gives an instant visual sense of magnitude — useful for understanding the relationship between nm and km, or mL and m³.

Material ChartsThe Construction tab opens with visual bar charts comparing material densities (from air to lead) and rebar weights (T10–T40). These give instant visual comparisons without needing to look up numbers.

Usage HeatmapThe History sidebar shows a usage heatmap at the top: category usage by frequency (colour-coded) and your most-used conversion pairs as mini bar charts. Helps you see your patterns at a glance.

Precision & CopyAdjust decimal places from 0 to 10 using the Precision dropdown. Very large or very small numbers switch to scientific notation automatically. Click Copy to grab the result value (without thousand separators) to your clipboard.

Unit Reference CardsClick any unit chip in the units bar to open a reference card showing the unit's full name, definition, measurement system, and a complete table of what 1 of that unit equals in every other unit in the category.

Factor Table ExportClick the Factor Table button in the controls row to download a CSV containing the full cross-multiplication table for the current category — every unit converted to every other unit. Opens in any spreadsheet app. Useful as a printable reference sheet.

Swap AnimationClicking the swap button between From and To animates the values physically swapping positions with a smooth transition, making it clear what just happened.

Searchable Unit PickersThe unit dropdowns are custom searchable pickers. Click to open, then type to filter the list (e.g. type "ft" to find ft, ft², ft³). Navigate with arrow keys and Enter. Much faster than scrolling through long lists, especially for Currency with 22 entries.

Number TickerWhen the result changes, the value counts up or down smoothly over 200ms rather than snapping instantly. Uses ease-out cubic easing for a natural feel. Snaps instantly for very large numbers or scientific notation.

Welcome ScreenA getting-started overlay appears on your first visit showing the key features. It won't show again after you dismiss it. You can reopen it any time from the button at the bottom of this Guide tab.

Responsive LayoutThe app adapts to any screen size. On tablets, tab labels hide to show icons only. On phones, the sidebar goes full-width and grids go single-column. Inputs stay at 16px to prevent mobile browser zoom. Works down to 360px width.

200+ Units · 16 CategoriesCovers Area, Angle, Currency, Data, Density, Energy, Flow Rate, Force, Length, Power, Pressure, Speed, Temperature, Time, Torque, Volume, and Weight. Includes construction-specific units like ksi, inH₂O, CFM, GPM, and ton of refrigeration alongside standard SI and Imperial units.