The Ultimate Converter
Type any conversion the way you'd search for it. Kitchen, health, lab, currency and every everyday unit, all in one place.
Kitchen conversions
Recipes switch between cups, tablespoons, grams and milliliters constantly. Convert volumes, weights and oven temperatures in seconds, and turn cups of a specific ingredient into grams for more accurate baking.
Cups, spoons and milliliters
Kitchen weights
Ingredient: cups to grams
Tip: you can type fractions like 1/2 or 1 1/2.
Oven temperatures
| °F | °C | Gas mark | Oven |
|---|---|---|---|
| 275 | 135 | 1 | Very low |
| 300 | 150 | 2 | Low |
| 325 | 165 | 3 | Moderately low |
| 350 | 180 | 4 | Moderate |
| 375 | 190 | 5 | Moderately hot |
| 400 | 200 | 6 | Hot |
| 425 | 220 | 7 | Hot |
| 450 | 230 | 8 | Very hot |
| 475 | 245 | 9 | Very hot |
| Measure | Tablespoons | Teaspoons | Fluid ounces | Milliliters |
|---|---|---|---|---|
| 1 cup | 16 | 48 | 8 | 236.6 |
| 3/4 cup | 12 | 36 | 6 | 177.4 |
| 2/3 cup | 10 ⅔ | 32 | 5.3 | 157.7 |
| 1/2 cup | 8 | 24 | 4 | 118.3 |
| 1/3 cup | 5 ⅓ | 16 | 2.7 | 78.9 |
| 1/4 cup | 4 | 12 | 2 | 59.1 |
| 1 tablespoon | 1 | 3 | 0.5 | 14.8 |
| 1 stick butter | 8 | 24 | 4 | 113 g by weight |
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Kitchen essentialsHealth and medical conversions
Turn an A1C result into an estimated average glucose, and convert common lab values between US units (mg/dL) and the international units (mmol/L) used in most other countries.
A1C to average blood glucose
Lab values: mg/dL and mmol/L
Body temperature
A typical adult body temperature is about 97 to 99°F (36.1 to 37.2°C).
Body weight
| A1C | Average glucose (mg/dL) | Average glucose (mmol/L) |
|---|---|---|
| 5% | 97 | 5.4 |
| 5.7% | 117 | 6.5 |
| 6% | 126 | 7.0 |
| 6.5% | 140 | 7.8 |
| 7% | 154 | 8.6 |
| 8% | 183 | 10.1 |
| 9% | 212 | 11.8 |
| 10% | 240 | 13.4 |
| 11% | 269 | 14.9 |
| 12% | 298 | 16.5 |
Medical note: these conversions are for general information only and are not medical advice. Always discuss your results and target ranges with your doctor.
Working on nutrition? Find your daily calories, protein, carbs and fat with our free macro calculator.
Macro calculatorChemistry lab calculators
Make solutions with confidence: calculate the mass you need for a given molarity, convert between grams and moles, solve C₁V₁ = C₂V₂ dilutions and switch between ppm, percent and mg/L.
Molarity: mass to weigh out
Example: 58.44 g/mol is sodium chloride (NaCl).
Grams and moles
Dilution: C₁V₁ = C₂V₂
ppm, percent and mg/L
Gas pressure
Kelvin and Celsius
Lab technician's best friend
The everyday bench calculations in one place: centrifuge RPM to g-force, serial dilutions, hemocytometer cell counts, metric prefixes, and microliter and microgram conversions.
Centrifuge: RPM and RCF (× g)
Serial dilution planner
Hemocytometer cell count
Metric prefix converter
Small volumes
Small masses
Currency converter
Convert between 160+ world currencies using daily reference exchange rates. Handy for travel budgets, online shopping and international invoices.
Live currency converter
Rates are daily reference rates. Your bank or card may charge a different rate plus fees.
Length and distance
Miles and kilometers, feet and meters, inches and centimeters: convert any distance from nanometers to nautical miles.
Length converter
Road distance
| From | To | Multiply by |
|---|---|---|
| Inches | Centimeters | 2.54 |
| Feet | Meters | 0.3048 |
| Yards | Meters | 0.9144 |
| Miles | Kilometers | 1.609344 |
| Kilometers | Miles | 0.621371 |
| Meters | Feet | 3.28084 |
Weight and mass
Pounds to kilograms, ounces to grams, stones, tons and carats.
Weight converter
| From | To | Multiply by |
|---|---|---|
| Pounds | Kilograms | 0.453592 |
| Kilograms | Pounds | 2.20462 |
| Ounces | Grams | 28.3495 |
| Grams | Ounces | 0.035274 |
| Stone | Pounds | 14 |
Volume
Liters, gallons, quarts, pints and cubic measurements, including US and UK (imperial) gallons, which are different sizes.
Volume converter
Temperature
Fahrenheit, Celsius, Kelvin and Rankine. Temperature scales have different starting points, so they use formulas rather than a single multiplier.
Temperature converter
| °F | °C | What it is |
|---|---|---|
| −40 | −40 | Where both scales meet |
| 32 | 0 | Water freezes |
| 68 | 20 | Room temperature |
| 98.6 | 37 | Normal body temperature |
| 212 | 100 | Water boils (sea level) |
Area
Square feet to square meters, acres to hectares and more, for floor plans, land and projects.
Area converter
Land area
Speed
Miles per hour, kilometers per hour, meters per second and knots.
Speed converter
Time
From milliseconds to years. Months and years use calendar averages.
Time converter
Digital storage
Bytes, megabytes, gigabytes and terabytes, plus binary units (GiB). Drive makers use 1,000-based units, while many operating systems use 1,024-based units, which is why a "1 TB" drive shows about 931 GB.
Data converter
Energy
Food calories and kilojoules, kilowatt-hours, BTUs and joules. Note that a food "Calorie" is really a kilocalorie.
Energy converter
Power
Watts, kilowatts, horsepower and BTU per hour.
Power converter
Pressure
PSI for tires, bar and kPa for gauges, and atm, mmHg and inches of mercury for science and weather.
Pressure converter
Fuel economy
Miles per gallon (US or UK) and liters per 100 km. Lower L/100 km means better efficiency, while higher mpg means better efficiency.
Fuel economy converter
Angle
Degrees, radians, gradians and full turns.
Angle converter
Every conversion in one place, ready in five minutes or less
Whether you're doubling a recipe, reading a lab report, prepping a solution at the bench or budgeting a trip abroad, you shouldn't need ten browser tabs to get it done. The Ultimate Converter brings the conversions people search for most into one fast, free page that works on any phone, tablet or computer.
Start with the search box at the top. Type a conversion just like you would in a search engine, like "2 cups to ml" or "30 psi to bar," and get an instant answer with the formula behind it. For anything more specialized, jump to a category and use the dedicated tools.
How to get the most accurate results
- US and UK units differ. A US gallon is 3.785 L, but a UK (imperial) gallon is 4.546 L. A US cup is 236.6 mL, while a metric cup is 250 mL.
- Weigh baking ingredients when you can. A cup of flour can weigh anywhere from 120 to 150 grams depending on how it's scooped. Our ingredient converter uses the "spooned and leveled" method.
- Watch your significant figures. Lab results should be reported to the precision of your least precise measurement. We show extra digits so you can round appropriately.
- Currency rates move daily. Treat conversions as a close estimate, since your bank's rate and fees will vary.
Frequently asked questions
How many mL are in a cup?
One US cup is about 236.6 mL. A metric cup, used in Australia and some recipes, is exactly 250 mL.
How do I convert Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. For example, 350°F is about 177°C.
How is A1C converted to average glucose?
Estimated average glucose (mg/dL) = 28.7 × A1C − 46.7. An A1C of 7% is about 154 mg/dL (8.6 mmol/L).
How do I convert RPM to g-force (RCF)?
RCF = 1.118 × 10⁻⁵ × rotor radius in cm × RPM². You need the rotor radius, which is listed in your centrifuge manual.
How often are the currency rates updated?
Exchange rates are refreshed daily from a reference rate provider. Banks and card companies add their own fees, so the rate you're charged may differ slightly.
Is my information saved?
No. Every calculation runs in your own browser. The only outside request is for currency rates, which doesn't include anything you type.
Conversions are provided for general information. Double-check critical values for medical, laboratory, engineering or financial decisions. Health conversions are not medical advice.