Convertidor de peso

Convierte kilogramos, libras, onzas, stones, tolas, carats y más, al instante.

Valor

Unidad de origen

Miligramo (mg)1000000

Gramo (g)1000

Tonelada métrica (t)0.001

Onza (oz)35.273962

Libra (lb)2.2046226

Stone (st)0.15747304

Tonelada corta (EE. UU.)0.0011023113

Tonelada (UK)0.00098420653

Quilate (ct)5000

Grano (gr)15432.358

Tola85.735279

Convert weight and mass units

Kilograms, grams, pounds, ounces, stones and tonnes converted instantly and precisely.

Recipes across measurement systems

Cookbooks and blogs mix grams, ounces and cups. Converting properly is the difference between a bake working and not.

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Shipping and luggage limits

Airlines and couriers quote limits in kg or lb depending on the country. Check yours before you get to the counter.

Open Currency Converter

Stones, tonnes and ounces

Less common units are included, which is what usually sends people looking for a second converter.

Open Age Calculator

Step-by-step guide

How to use Weight Converter?

Convert weight between kilograms, grams, pounds, ounces, tonnes and stones in one tap.

Step-by-step instructions

1
Enter the weight value.
2
Choose the 'from' unit (kg, g, lb, oz, t, st).
3
Choose the 'to' unit.
4
See the converted value instantly.

Benefits

Covers all common weight units.
Precise decimal output.
Instant bidirectional conversion.
Works offline.

Who is it for?

Home cooks converting recipes
Fitness users tracking weight in different units
Shippers calculating parcel weights

FAQ

Preguntas frecuentes

Enter the numeric value into the left-hand input box labeled "Amount", choose "Kilograms (kg)" from the "From" dropdown and pick "Pounds (lb)" in the "To" dropdown, then click the blue "Convert" button or press Enter. The tool uses the exact constant 1 kg = 2.2046226218 lb and shows the result immediately in the result panel with a default precision of 2 decimals (e.g., 75 kg → 165.35 lb). If you need more precision use the "Precision" selector to set 0–6 decimal places; click the small copy icon to copy the numeric result to clipboard as plain text.

The converter supports a wide set of mass units: kilograms (kg), grams (g), milligrams (mg), pounds (lb), ounces (oz), stones (st), metric tonnes (t), and US short tons (ton). Unit selection appears in the two dropdowns labeled "From" and "To"; you can also type a unit abbreviation (like "lb") in the search box inside the dropdown to filter quickly. All conversions use well-known constants (for example 1 lb = 0.45359237 kg) and the UI will disable unsupported combinations (none for this tool) and show a tooltip with the exact factor when you hover the small info icon.

Yes — type the ounce amount into "Amount", select "Ounces (oz)" from the "From" dropdown and "Grams (g)" from the "To" dropdown, then press "Convert" or Enter; the result appears instantly. The tool uses the exact conversion 1 oz = 28.349523125 g and displays results with the chosen precision; if you paste a list of values (comma or newline separated) the batch panel will parse up to 10,000 lines and produce a downloadable .csv with columns Input, FromUnit, ToUnit, and Result. Note: mobile Safari may prevent automatic .csv downloads — use the "Copy" button and paste into Notes or an email on iOS.

Conversions use internationally standardized exact factors (for example 1 kg = 2.2046226218 lb, 1 oz = 28.349523125 g), and the UI performs calculations in JavaScript double precision before formatting. The "Precision" dropdown lets you set rounding between 0 and 6 decimal places; choosing 6 shows full practical precision while 0–2 is better for everyday weight display. If you need exact integer-safe math for extremely large values, export results as .csv and re-calculate in a high-precision tool, because JavaScript doubles can round after about 15 significant digits.

Yes — open the "Batch" tab next to the single-conversion area, paste or upload a .csv or .txt file (comma, tab, or newline-separated) up to roughly 5 MB or 10,000 lines, choose your units and precision, then click "Convert All". The page generates a downloadable .csv file (filename like conversions_YYYYMMDD.csv) containing Input, FromUnit, ToUnit, and Result columns and will begin a browser download; on iOS Safari automatic file downloads may be blocked, in which case use the built-in "Copy" button to copy table rows and paste into Notes or Files. Uploaded files are processed in your browser and not sent to a server; the tool also accepts scientific notation (e.g., 1e3) as input.

Common causes include pasted commas as thousands separators ("1,000"), locale-specific decimal commas ("1,5"), or hidden non-printable characters; the validator expects plain numbers or scientific notation like 1e3. Fix by removing commas, replacing decimal commas with periods, or use the "Sanitize" button in the Batch panel which strips grouping characters and converts commas to periods. If you still see "Overflow" or "Infinity" the value exceeds the internal limit (approx ±1,000,000,000) — reduce the magnitude or split into multiple rows before converting.

On desktop (Chrome, Firefox, Edge) everything — Convert, Copy, Export — works normally; the numeric input shows the default keyboard on desktop. On mobile, the input is type=number so iOS and Android open a numeric keypad which speeds typing, but iOS Safari sometimes uses a comma as decimal separator based on locale and may block automatic .csv downloads; in that case use "Copy" to transfer results. Also older Safari versions (iOS 12 and earlier) do not support navigator.clipboard.writeText, so the copy button falls back to selecting the result for manual copying.

All conversions and batch processing are executed client-side in your browser using JavaScript; there is no signup or account activity and the site does not upload your numeric inputs to a remote API during conversion. Temporary files you download (like .csv) are created locally; the only network calls are for loading the web page assets (HTML/CSS/JS). If you inspect Developer Tools you can confirm no conversion POST requests are made; however if you explicitly use the "Share Results" button it will create a downloadable file which your browser might upload to cloud services only if you choose to save to iCloud/Drive manually.

The input accepts integers and floating points up to roughly ±1,000,000,000 (1e9) and supports scientific notation like 6.022e23; values beyond that may be rounded to Infinity due to JavaScript double limits. Negative numbers are accepted (useful for differences or offsets) but the tool displays a warning banner noting that physical mass cannot be negative; the result will be negative accordingly. Extremely precise needs (beyond 15 significant digits) should export to .csv and be re-processed in arbitrary-precision software because JavaScript floating-point math may introduce small rounding errors.

This online converter is instant and has built-in unit selection, exact standardized constants, and batch export to .csv which saves time compared with manually entering formulas in Excel; Excel requires you to type =A1*2.2046226218 or use Power Query for bulk work. Excel/LibreOffice are better when you need complex spreadsheets, cell-level formulas, or arbitrary precision add-ins; this web tool is more convenient for quick single or bulk conversions without opening an app and for exporting clean .csv results. For very large datasets (tens of thousands of rows) desktop tools can be faster and use less memory than a browser tab.

Use Tab/Shift+Tab to move between Amount, From and To fields, type the number and press Enter to trigger Convert without touching the mouse; Ctrl+L focuses the Amount field on desktop (Cmd+L on macOS focuses the address bar, so instead use Alt+C to focus Convert if shown in your browser). For repeated unit flips, use the small "Swap" icon between the two dropdowns to swap From/To instantly, and the "History" sidebar keeps the last 20 conversions so you can re-copy without retyping. For bulk work, paste newline-separated numbers into the Batch tab and click "Convert All", then download the .csv; this avoids manual entry and preserves consistent precision.

The converter is free to use in the browser with no account creation required; there are no watermarks on numeric outputs or exported .csv files and no premium paywall gating the standard units and precision options. The only trade-offs are browser-imposed: large batch files (above ~5 MB) may be slow or fail on low-memory mobile devices, and automatic downloads can be blocked by some mobile browsers which then require manual copy/paste. If you need programmatic access, consider using exported .csv files or re-implementing the same constants in scripts — the web UI is intended for interactive use, not as an API.

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