Conversions calculators
Free unit converters: mL to oz, stone to pounds, military time, water column to psi and battery mAh to Wh — each with charts.
Military Time Converter (24-Hour Clock)
Convert military time to standard time and back — 1330, 1845, 2230 and every hour — with a full 24-hour military time chart and how to say it.
mL to oz Converter (750 mL in Ounces)
How many ounces in 750 mL? Convert milliliters to US or UK fluid ounces, cups and shots, with a chart of common bottle sizes.
Stone to Pounds Converter (st, lb, kg)
Convert stones and pounds to lbs or kg and back. Enter weight as 11 st 4 lb, 158 lb or 72 kg and get every unit plus a stone chart.
Water Column to PSI Converter (inWC, ftH₂O)
Convert inches or feet of water column (inWC, ftH₂O) to psi, kPa, mbar and back — for gas pressure, pumps, HVAC and water tanks.
mAh to Wh Converter (Battery Capacity)
Convert battery capacity between mAh, Ah and Wh at any voltage. Check power banks against the 100 Wh airline carry-on limit and estimate runtime.
Trash Bag & Bin Size Converter (Litres to Gallons)
Convert trash bag and wheelie bin sizes between litres and gallons: 13, 30, 33 and 55 gallon bags and 140–1,100 litre bins, and find the bag that fits.