Unit converter: just type what you need
Write it the way you would say it, like 5 ft 9 in to cm or 350 F to C. The answer shows up below, with the math.
The answer appears below as you type.
5 feet 9 inches =
175.26cm
Formula: cm = ft × 30.48
The math, step by step
- Write it all in feet: 5 + 9 in ÷ 12 = 5.75 ft
- Convert: 5.75 ft × 30.48 = 175.26 cm
Definitions used: 1 ft = 0.3048 m exactly (international foot); 1 in = 2.54 cm exactly; 1 cm = 0.01 m (SI prefix centi).
Source: NIST SP 811, Appendix B.8, checked on .
Nearby values
| Feet (ft) | Centimeters (cm) |
|---|---|
| 3 | 91.44 |
| 4 | 121.92 |
| 5 | 152.4 |
| 5.75 | 175.26 |
| 6 | 182.88 |
| 7 | 213.36 |
| 8 | 243.84 |
- Free, no sign-up
- Sources checked Oct 2026
- Runs in your browser
Or start from a category
How it works
Step 1
Type the conversion
Use everyday words: “10 kg to lbs”, “5 ft 9 in to cm”, “1 1/2 cups to ml”. Symbols, plurals and fractions all work.
Step 2
Read the answer
The result appears in large type as you type, with the same value written the way people say it, like 5 ft 8.9 in.
Step 3
Check the math
Below the answer you get the formula, each step with your numbers, nearby values and the official definition behind the factor.
Popular conversions
cm to inches
Height, screens and clothing sizes.Inches to cm
TV sizes, waist sizes and heights.Feet to meters
Room sizes, heights and altitudes.km to miles
Race distances and road trips.Miles to km
Driving distances and running pace.kg to lbs
Body weight, luggage and gym plates.lbs to kg
Body weight, barbells and shipping.oz to grams
Recipes, postage and portions.Grams to oz
Kitchen scales, yarn and coffee.Celsius to Fahrenheit
Weather, fever and oven settings.Fahrenheit to Celsius
Oven recipes, weather and fever.Liters to gallons
Fuel, water bottles and tanks.mL to cups
Recipes written in milliliters.Tablespoons to mL
Spoon measures for cooking and syrups.mph to km/h
Speed limits, cars and wind.MB to GB
File sizes, data plans and storage.Square feet to square meters
Apartments, houses and flooring.Acres to hectares
Land, farms and lots.Cups to grams
Flour, sugar, butter and 17 more.
Why this converter
One bar for everything
No menus to dig through. One sentence handles length, weight, temperature, volume, area, speed, data and time.
Factors you can trace
Each result names the definition it used and links to NIST, the FDA or the USDA, with the date we checked it.
The steps, not just a number
See the formula and every step with your own values, so you can redo it by hand or explain it to someone.
Charts on every page
Each conversion page has a table of common values and worked examples for real situations.
Honest about cups and gigabytes
A cup can be 236.6 or 240 mL and a gigabyte 1,000 or 1,024 megabytes. We show which one you are getting.
Nothing leaves your device
Every calculation runs in your browser. No account, no upload, no network request to compute a result.
Questions people ask about converting units
How do I convert units by typing?
Write a number, the unit you have, the word “to” and the unit you want: 10 kg to lbs. You can mix units (5 ft 9 in to cm), use fractions (1 1/2 cups to ml) and symbols (5'9" to cm). If you leave out the target, the converter picks the usual counterpart, so “72 inches” becomes centimeters.
Which units does it understand?
Length (mm to miles and nautical miles), weight (mg to tons, including stone), temperature (Celsius, Fahrenheit, Kelvin), volume (mL to US and imperial gallons, cups and spoons), area (square inches to square miles, acres and hectares), speed, data size (decimal and binary) and time. Time zones have their own converter.
Where do the conversion factors come from?
From the exact definitions published by NIST: 1 inch = 2.54 cm, 1 pound = 0.45359237 kg and 1 US gallon = 231 cubic inches (3.785411784 L). Label measures follow the FDA rule in 21 CFR 101.9 and cup weights come from USDA FoodData Central. Each result links to its source and shows the date we checked it.
Why can I not convert cups straight to grams in the bar?
Because a cup measures space and a gram measures mass, and every ingredient packs differently: a cup of all-purpose flour weighs 125 g, a cup of granulated sugar 200 g and a cup of honey 339 g in USDA data. The cups to grams converter asks for the ingredient first.
How precise are the answers?
The math uses the exact factors with full floating-point precision, then shows 6 significant digits. That is far more than a ruler or kitchen scale can measure. For trade, engineering or medical dosing, confirm the figure in the official source.
Is the converter free? Does it store what I type?
It is free and needs no account. Every calculation happens in your browser, and nothing you type is sent to a server. A shared link may carry the conversion in its address so the other person sees the same answer.
Sources and limits
- NIST SP 811, Appendix B.8
NIST Special Publication 811, Guide for the Use of the SI, Appendix B.8: Factors for Units Listed Alphabetically (page updated August 18, 2025).
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- NIST Handbook 44 (2026), Appendix C
NIST Handbook 44-2026, Appendix C: General Tables of Units of Measurement.
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- NIST, U.S. survey foot (85 FR 62698)
Federal Register notice of October 5, 2020 (85 FR 62698): the U.S. survey foot is superseded by the international foot from January 1, 2023.
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- NIST, Prefixes for binary multiples
IEC 60027-2 (second edition, 2000-11), as described by NIST in “Prefixes for binary multiples”.
National Institute of Standards and Technology. Edition or effective date: . Text in force when checked on .
- 21 CFR 101.9(b)(5)(viii)
Code of Federal Regulations, Title 21, § 101.9(b)(5)(viii): household measures for nutrition labeling (text in force when checked).
U.S. Food and Drug Administration. Text in force when checked on .
- USDA FoodData Central (SR Legacy)
FoodData Central, SR Legacy release of April 2019: household measures (“Measures” tab of each food).
U.S. Department of Agriculture, Agricultural Research Service. Edition or effective date: . Text in force when checked on .
- IANA Time Zone Database (browser copy)
IANA Time Zone Database, in the version shipped with your browser.
Internet Assigned Numbers Authority. Text in force when checked on .
This is a calculation aid, not an official measurement service. Results are rounded to 6 significant digits for display. For trade, engineering, medical dosing or legal documents, confirm the figure in the official source. Nothing you type leaves your browser.