Weight and Mass Converter
Convert pounds, kilograms, ounces, stone and explicitly identified ton and troy units.
YOUR CALCULATION
Result
—
Calculation steps
Work through one step at a time or reveal the complete calculation. The steps use your current inputs.
How to calculate
Convert mass to kilograms, preserving the distinction between ordinary ounces and troy ounces.
kilograms=value×kg per source unit; target=kilograms/kg per target unit
Worked example
150 avoirdupois pounds are 68.0388555 kg. One stone contains 14 pounds; an ordinary ounce is 1/16 pound.
Assumptions and input details
Weight here means everyday mass, not gravitational force. The international pound is exactly 0.45359237 kg. US short tons contain 2000 lb and Imperial long tons 2240 lb; a metric tonne is 1000 kg. Troy ounces contain 480 grains, while an ordinary ounce contains 437.5 grains. No health target or product suitability is inferred.
References: NIST Guide to the SI: conversion factors
Using this calculator
Can I enter my own problem?
Yes. Replace the example values with your own inputs. The result, calculation steps, tables and applicable diagrams update from those inputs. Blank or invalid values clear the result; example values are never silently substituted for missing inputs.
Are the results exact?
Results use floating-point arithmetic and displayed rounding. Read the formula, assumptions and any stated data precision before interpreting the result.
Is my input uploaded?
The calculation runs in your browser. No account, file upload or external AI service is required. Inputs are not saved between page reloads.
Convert newtons, pound-force, kilogram-force, ounce-force and dynes.
Scale every ingredient from the original servings to a new serving count. Enter fractions, select each ingredient’s units and inspect a complete quantity table.
Convert liters, US and Imperial liquid measures, cooking cups and cubic volumes with explicit definitions.
Reserved advertising space.