Productivity & Units Tools
Storage, speed, length, weight and paper-size conversion for the moments a spec sheet and your reality use different units.
Built for everyone, daily. 42 tools published.
Attachment Limits
Attachments are base64 encoded, which adds exactly a third. The limit applies after encoding, so the number on the file is not the number that counts.
📏Baker's Percentage
Scale water, salt and yeast from flour weight while keeping flour at 100 percent.
📏Batch Cooking Planner
Work backward from serving time, expose dependency errors and flag shared-equipment overlaps.
📏Batch Pan Capacity
Compare recipe volume with usable pan volume and headspace.
📏Battery Ah to Wh
Include voltage and usable-capacity limits instead of treating amp-hours as energy by itself.
📏Celsius to Fahrenheit
All four scales at once, with the offset handled correctly — plus the trap that catches everyone: converting a temperature difference is not the same as converting a temperature.
📏Cups to mL
“One cup” is five different volumes depending on where the recipe was written. Pick the right one, and find out why an Australian tablespoon will ruin your scones.
📏Displacement Calc
A millimetre of bore adds more capacity than a millimetre of stroke. And one cubic centimetre off the chamber moves compression from 10.5 to 10.68.
📏Drive Capacity
A 1 TB drive really holds a trillion bytes. Windows divides by 1024 and still writes GB on the label, so it shows 931. The drive is fine; the units are not.
📏Electricity Tariff Units
Normalize energy prices before comparing utility and wholesale quotations.
📏EV Charging CSV
Turn one measured charging session into a reproducible local CSV row.
📏EV Route Buffer
Test user-entered route energy without claiming live range or charger availability.
📏EV Winter Range
Apply an editable cold-weather loss and arrival reserve to a rated or observed baseline.
📏Feet to cm
Type 5'11", 5 ft 11, 5-11 or 71 in — it reads all of them. Built for height, with the rounding traps that make passports and medical forms disagree.
📏Fleet Charging Ports
Translate fleet energy demand, dwell time and charger sharing into port count.
📏Gearing & RPM
Tyre circumference sits in the denominator of the same equation as the final drive, so a tyre change is a gearing change whether you meant it or not.
📏GSM Basis Weight
Use the entered basis-sheet dimensions instead of treating pounds per ream as one universal conversion.
📏kg to Pounds
Reads and writes British weight the way people actually say it — 11 st 4 lb, not 11.29 stone. Handles the fourteen-pound boundary that trips up mental arithmetic.
📏MB to GB
The reason your 1 TB drive shows 931 GB, settled. Convert in base-10 or base-2, see both answers side by side, and find out which one your operating system uses.
📏Measured Economy
It estimates from injector timing rather than measuring. The pump measures — but one tank is noisy, because auto-shutoff never stops in the same place twice.
📏Morse Code
Three dots is S, or EEE, or IE — the spacing decides which. Translate both ways, hear it at the correct timing, and see why SOS is not three letters.
📏MPG to L/100km
US and imperial MPG are 20% apart and almost nobody labels which one they mean. Convert all four measures at once and see the real cost per distance.
📏MPGe to kWh/100 mi
Use the EPA gasoline-energy equivalent while keeping charging-boundary differences visible.
📏Number to Words
British English puts an \u201cand\u201d before the last part and American does not. And a billion is not the same number everywhere it is written.
📏Oven Schedule Planner
Work backward from serving time for several dishes sharing one oven.
📏Oven Temperature Converter
Includes the fan-oven adjustment almost every chart leaves out — the 20°C that explains why your bakes brown too fast and dry out in the middle.
📏Pages to Study Sessions
Use a measured reading pace and focused-session efficiency instead of a universal speed.
📏Pan Converter
Batter fills area, and area goes with the square of the radius. To double an 8 inch round you need 11.3 inches, not 16.
📏Paper Sizes
Every A size has the same shape, so halving one gives the next. Letter does not share that shape, which is why no single scale fits both.
📏Peak Sun Hours
Turn average plane-of-array irradiance over a duration into equivalent full-sun hours.
📏Photo Storage
A 24 MP RAW is about the same size every time. A JPEG of a grey sky and of foliage can differ threefold from the same camera, so one number would be a guess.
📏Roman Numerals
Only I, X and C can be subtracted, and only from the next two symbols up. That single rule is why so many hand-written numerals are wrong.
📏Square Footage
Area conversions are the square of length conversions, L-shaped rooms are two rectangles, and flooring needs more than the room does.
📏Text to Binary
A is one byte, 中 is three, and a family emoji is eighteen. Convert both directions and see where the bytes actually go.
📏Tire Speed Difference
Decode two metric tire sizes into diameter and indicated-to-actual speed difference.
📏Torque & Power
33,000 foot-pounds per minute divided by 2π is 5252.11. That is the whole reason the two curves meet — nothing about the engine.
📏Towing & Payload
Four limits apply at once, and the advertised towing figure is rarely the one you hit first. Usually it is payload, and usually nobody checks.
📏TV Size Compare
Screens are sold by diagonal and watched by area, and area grows with the square. The upgrade is always larger than the number implies.
📏Tyre Pressure & Temp
32 psi set on a 20 °C day reads 28.8 at freezing. Nothing leaked — air pressure follows absolute temperature.
📏Tyre Size Compare
45 in 225/45R17 means 45% of 225 mm. Change the width and the sidewall changes too — which is how a 'same size' tyre ends up 3% taller.
📏Unit Converter
Length, mass, volume, area, speed and temperature — with the units that share a name listed separately instead of silently picked for you.
📏Video File Size
Bitrate is in megabits, file size is in megabytes, and forgetting the eight between them is the usual mistake. Includes audio and the size your OS will show.