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What does this converter do?
Unit converter: convert length, weight, temperature, volume, speed, pressure, and area values between metric and imperial. Free, private, runs locally.
How this calculator works
Frequently asked questions
What is a unit converter and how does it work?
A unit converter is a browser-based tool that instantly translates values between different measurement units like length, weight, and temperature without requiring you to sign up or create an account.
Do I need to create an account or share my data to use the unit converter?
No, the unit converter is completely no-signup and runs entirely in your browser, meaning your data is never stored or sent to a server, ensuring total privacy.
Is the unit converter accurate for scientific or engineering calculations?
Yes, the unit converter uses standard, up-to-date conversion factors to provide highly accurate results suitable for both everyday and precise scientific calculations.
Cite this tool
BoringToolsKit. “Unit Converter.” boringtoolskit.com/unit-conv/. Free to reference in articles, syllabi, and answer posts with a link.
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Worked example: carpet roll yards from square yards
The area-length mode converts an area of flooring or fabric into a run length, and it is the only mode that needs a third input: the material width. Take a common carpet order: 40 square yards of material, roll width 12 feet, and you need linear yards. Type square yards as the area unit, linear yards as the length unit, width 12, width unit feet, waste 0.
Internally the tool converts both widths to meters first: 12 ft x 0.3048 = 3.6576 m. The area converts as 40 sq yd x 0.83612736 = 33.4450944 square meters. Run length in meters is 33.4450944 / 3.6576 = 9.144 m, and linear yards is 9.144 / 0.9144 = exactly 10 linear yards. The result panel reads '10 linear yd' and the factor line states the rate at the width you entered: 1 sq yd = 0.25 linear yd at 12 ft width. That rate is width-specific: the same 40 sq yd on a 13.2 ft wide roll (4.02336 m) gives 33.4450944 / 4.02336 / 0.9144 = 9.0909 linear yards.
Now set waste to 10 percent. The computed length stays 10 linear yd, but the output adds a planning line: with 10% waste, buy 11 linear yd, because the tool multiplies the run length by 1 + 10/100 = 1.1. The waste multiplier also applies in the reverse direction: 10 linear yd on a 12 ft roll becomes 40 sq yd of material, and a 10 percent allowance makes it plan for 44 sq yd instead. The formula behind all of it is run_m = area_m2 / (width_m x width_unit_factor_m_per_unit), then divided by the target unit's meter factor 0.9144 for linear yards.
Boundary behavior: zero, caps, negatives, and precision
Several inputs have hard edges worth knowing before you type. Waste accepts 0 to 100 and rejects anything else: a value of -5 or 150 returns 'Waste allowance must be between 0 and 100' instead of a result. At 0 percent the planning value equals the raw value exactly; at the 100 percent cap the planning value is exactly double the raw value, so 10 linear yd becomes 20 linear yd, which is the tool's way of saying order twice the measured run. Material width must be strictly greater than zero: width 0 returns an error, and width 0.0001 is accepted but produces an absurdly large run length, which is arithmetic, not a bug.
Negative values are rejected for every type except temperature, where the input loses its min=0 attribute so -40 F is legal and converts to -40 C. Type mismatches inside area-length fail loudly: picking two square units, or two linear units, returns 'Choose one square-area unit and one linear-length unit.' because no width can bridge them. Same-unit From and To pairs are prevented in the dropdown, which jumps the To selection to the next option.
Precision truncates display, never the math: the default 6 decimals shows 25 m to ft as 82.020997, while precision 2 shows 82.02; the underlying value is always the full 25/0.3048 = 82.0209973753 ft. Displays switch to scientific notation only when a magnitude falls below 10^-precision or above 10^15. Finally, the tool is a pure offline matrix: it has no live exchange-style rates to go stale, but it also will not warn you when a job site uses nominal widths (a '12 foot' roll that measures 11.83 ft) that change the real answer by about 1.4 percent.