Unit Converters

Convert pounds to kilograms — shipping, international forms, and equipment specs.

Convert centimeters to inches — height, screen sizes, and product dimensions.

Convert inches to centimeters — furniture, parcels, and clothing measurements.

Convert kilometers to miles — race distances, road signs, and trip odometers.

Convert miles to kilometers — marathons, road trips abroad, and run logs.

Convert Celsius to Fahrenheit — weather, cooking, and thermostat settings.

Convert Fahrenheit to Celsius — fevers, recipes, and forecasts abroad.

Convert liters to US gallons — fuel fills, aquariums, and container sizes.

Convert US gallons to liters — tanks, recipes, and specs sold in liters.

Convert US MPG to L/100km — read a car’s economy the way the rest of the world quotes it.

Convert L/100km to US MPG — turn a European economy figure into miles per gallon.

Miles per hour to kilometers per hour, with the speed limits you will actually meet.

Kilometers per hour to miles per hour — read a metric speed limit in your own units.

Floor area from sq ft to m² — the number every listing outside the US quotes.

Floor area from m² to sq ft — sizing a metric listing in US terms.

Land area from acres to hectares, with the exact survey-derived factor.

Land area from hectares to acres — a hectare is just under two and a half acres.

Megabytes to gigabytes — and why your drive shows less than the box promised.

Gigabytes to megabytes — sizing a data plan, a download, or a backup.

Minutes to hours as a decimal — the format timesheets and payroll expect.

Hours to minutes, including the decimal hours a timesheet hands you.

Convert between millimeters, centimeters, meters, kilometers, inches, feet, yards, miles, and nautical miles.

Convert between milligrams, grams, kilograms, tonnes, ounces, pounds, stone, and both kinds of ton.

Convert between milliliters, liters, cubic meters, and both the US and imperial cups, pints, quarts, and gallons.

Convert between milliseconds, seconds, minutes, hours, days, weeks, months, and years — with instant-answer pages for the common ones.

Convert feet to meters — ceiling heights, room dimensions, and depths quoted the other way.

Convert meters to feet — heights, room sizes, and spec sheets written in metric.

Convert yards to meters — track distances, fabric, and field measurements.

Convert meters to yards — swimming pools, athletics, and fabric bought abroad.

Convert millimeters to inches — hardware, drill bits, screens, and drawings.

Convert inches to millimeters — metric hardware, tooling, and machine specs.

Convert grams to ounces — postage, ingredients, and product weights in metric.

Convert ounces to grams — recipes, shipping weights, and scales set to metric.

Convert stone to pounds — the UK and Irish body-weight unit, read in US pounds.

Convert pounds to stone and pounds — the reading a UK or Irish scale gives.

Convert milliliters to US fluid ounces — bottles, cabin-bag limits, and recipes.

Convert US fluid ounces to milliliters — metric measuring jugs and bottle labels.

Convert tablespoons to cups — scaling a recipe without washing another measure.

Convert cups to tablespoons — measuring a part-cup when the cup measure is dirty.

Convert fluid ounces to US cups — and tell fluid ounces apart from ounces on a scale.

Convert US cups to fluid ounces — the eight-ounce cup, and where the metric cup differs.

Convert US teaspoons to milliliters — and why a medicine spoon is 5 mL, not 4.93.

Convert milliliters to US teaspoons — for a metric label measured with American spoons.

Convert US tablespoons to milliliters — and spot the 20 mL Australian tablespoon.

Convert milliliters to US tablespoons — for a metric quantity measured with US spoons.

Convert milliliters to US cups — and see how far the 250 mL metric cup is from the US one.

Convert US cups to milliliters — the number to pour when the jug is marked in metric.

Convert US pints to cups — two cups to the pint, and why a British pint is not.

Convert US cups to pints — for scaling a recipe up to a container size.

Convert US quarts to cups — four cups to the quart, for stock and brine.

Convert US cups to quarts — for sizing a pot, a jar or a batch of stock.

Convert US quarts to gallons — four quarts to the gallon, exactly.

Convert US gallons to quarts — for splitting a bulk container into batches.

Convert US pints to gallons — eight pints to the gallon in the US system.

Convert US gallons to pints — for portioning a bulk liquid into servings.

Convert pounds to ounces — sixteen to the pound, and the troy ounce that is not.

Convert ounces to pounds — for a scale that reads in ounces and a form that wants pounds.

Convert pounds to grams — one pound is 453.59237 grams, exactly.

Convert grams to pounds — for a metric scale and a recipe written in pounds.

Convert weeks to years — and see why 52 weeks is 364 days rather than a full year.

Convert years to weeks — a year is 52.18 weeks, not the 52 everyone assumes.

Convert days to years — for ages, sentences, milestones and anything counted in days.

Convert years to days — 365.2425 on average, and why the leap rule skips three centuries in four.

Convert hours to weeks — 168 hours in a week, and what a 40-hour week is a fraction of.

Convert weeks to hours — for project estimates, rosters and billable planning.

Convert months to years — twelve to the year exactly, unlike every other time unit.

Convert years to months — for loan terms, leases, warranties and infant ages.

Convert seconds to years — for timestamps, uptime and anything counted in epoch seconds.

Convert years to seconds — a Gregorian year is exactly 31,556,952 seconds.

Convert hours to days — twenty-four to the day, except on the two days a year it is not.

Convert days to hours — for shift planning, travel time and anything billed by the hour.

Convert days to weeks — seven to the week, and how a 30-day month splits.

Convert weeks to days — for pregnancy weeks, notice periods and sprint planning.

Convert seconds to hours — for logs, media durations and anything a machine timed.

Convert hours to seconds — for timeouts, encoding settings and cache lifetimes.

Convert minutes to days — 1,440 to the day, for timesheets and long durations.

Convert days to minutes — a day is 1,440 minutes, which is where a lot of estimates start.

Convert months to days — the average month is 30.44 days, and no actual month is.

Convert days to months — and why a 30-day month is 0.986 of the average, not one.

Convert inches to feet — twelve to the foot, and how to read the remainder.

Convert feet to inches — and why 5.9 feet is not five foot nine.

Convert cm to feet — for heights, with the feet-and-inches reading alongside.

Convert feet to cm — exactly 30.48 per foot, not the 30 people round to.

Convert cm to m — a decimal shift, and exact in a way imperial units never were.

Convert m to cm — multiply by a hundred, and the SI ladder behind it.

Convert mm to cm — ten to one, the shortest step on the metric ladder.

Convert cm to mm — and how a drawing states its unit once, not per dimension.

Convert mm to m — three decimal places, and no rounding anywhere.

Convert m to mm — a thousand to one, the unit machine shops work in.

Convert km to m — with the race distances that are not round numbers.

Convert m to km — and why a marathon is 42,195 metres and not 42,000.

Convert feet to miles — 5,280 to the mile, and the reason it is not round.

Convert miles to feet — and why a nautical mile is a different number.

Convert g to kg — and the one SI base unit that already has a prefix.

Convert kg to g — a thousand to one, since the 2019 redefinition.

Convert mg to g — the step where a misplaced decimal becomes a dose error.

Convert g to mg — and why a trailing zero is banned on a prescription.

Convert square feet to acres — 43,560 to the acre, and where that came from.

Convert acres to square feet — an acre is an area, never a shape.

Convert KB to MB — a thousand to one, and why your computer may say 1,024.

Convert MB to KB — for upload limits, attachment caps and image sizes.

Convert KB to GB — a million to one, where small errors get large.

Convert GB to KB — one million kilobytes, and the prefixes in between.

Convert GB to TB — and why a 1 TB drive reports about 931 GB.

Convert TB to GB — a thousand to one, and the drive-label lawsuits.

Convert bytes to MB — for file sizes read straight off a system.

Convert bytes to GB — a billion to one, and where the two answers diverge.

Convert bits to bytes — eight to one, and b and B are not the same symbol.

Convert Mbps to Gbps — a thousand to one, for broadband and network links.

Convert Kbps to Mbps — for stream bitrates and older connection speeds.

Convert Mbps to MB/s — divide by eight, which is why 100 Mbps is 12.5 MB/s.