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Mass & weight

Metric, imperial, and specialized mass units.

Choose the tool whose inputs and output match your task. Check each calculator’s assumptions and limitations before using its result.

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These converters move weight and mass between metric and customary units for body weight, shipping, gym plates, and small doses. Start with the kg to lbs converter when your source is metric and you need pounds. If a weigh-in is written in stone, the stone to kg converter reads it into kilograms, and the pounds to stone converter does the reverse for UK body-weight notes. For tiny quantities on supplement and lab labels, the mcg to mg converter shifts values along the metric scale without changing the amount. Choose the tool by the unit you already have. More measurement tools live in the Conversion collection.

14 of 14 calculators

Mass & weight14 calculators

Decagram to gram converter

Convert decagrams to grams or grams to decagrams with the exact metric factor 1 dag = 10 g, plus food, classroom, and lab notation guidance.

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Density Converter Calculator (kg/m³, g/cm³, lb/ft³)

Convert density between kg/m³, g/cm³, and lb/ft³ with exact definition-based factors in a free density converter calculator for materials, fluids, and soils.

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Force Converter

Convert force among newtons, pound-force, and kilogram-force using the pound definition and standard gravity.

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g to lbs Converter

Convert grams to pounds for food, nutrition, postage, and small package weights using the calculator's 1 lb = 453.59237 g factor.

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Grams To Calories Calculator

Convert grams of protein, carbohydrate, and fat to food Calories using 4, 4, and 9 kcal per gram, or use a custom kcal per gram value.

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kg to lbs Converter

Convert kilograms to pounds for body weight, gym plates, luggage, freight, and metric records using the calculator's 1 kg = 2.2046226218487757 lb factor.

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kg to Stones Converter

Convert kilograms to decimal stones and stone plus pounds with metric-first explanations, conversion details, examples, and UK body-weight context.

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Lbs to Newtons Converter

Convert pound-force to newtons and newtons to pound-force for force, load, spring, fastener, and mechanics calculations.

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mcg to mg Converter

Convert micrograms to milligrams using the exact SI relationship 1 mg = 1000 mcg, with dosing cautions, examples, and reference tables.

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mg to lbs Converter

Convert milligrams to pounds with decimal and scientific notation, plus ounces and grams for lab samples, ingredients, materials, and tiny package weights.

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ms to Seconds Converter

Convert milliseconds to seconds or seconds to milliseconds for programming, latency, audio, sports timing, and measurement logs.

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Pounds to Stone Converter

Convert pounds to stone with the exact 14 lb per stone factor, canonical lb-to-st guidance, decimal-stone examples, and UK body-weight context.

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Stone to kg Converter

Convert stone to kilograms with a body-weight-focused guide, exact formulas, stone-and-pound context, examples, and common UK and Ireland usage notes.

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Stone to lbs converter

Convert stone to pounds with the exact 14 lb per stone relationship, plus kilogram context, body-weight examples, and stone-and-pound reading tips.

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Frequently asked questions

How do I convert kilograms to stones?
Divide kilograms by 6.35029318. The result is decimal stone, which is best for calculation. The calculator also takes the whole-stone part and converts the decimal remainder into pounds, giving the familiar UK and Irish style such as 11 st 0.32 lb.
Why does the calculator show stone and pounds?
Decimal stone is mathematically tidy, but many people who use stone for body weight speak in whole stones plus remaining pounds. The mixed result keeps that familiar format while still showing decimal stone for spreadsheets, charts, fitness logs, and comparisons.
What is 70 kg in stones?
Using this calculator's factor, 70 kilograms divided by 6.35029318 equals about 11.0231 stones. The whole-stone part is 11, and the decimal remainder converts to about 0.32 pounds, so the mixed reading is approximately 11 st 0.32 lb.

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Related comparisons

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Density vs Viscosity CalculatorCompare density, mass per volume converted among kg/m³, g/cm³, and lb/ft³, with viscosity, a fluid's resistance to flow converted among pascal-second, poise, centipoise, and millipascal-second.Force Converter vs Lbs to Newton ConverterCompare the force converter's three-unit hub — newtons, pound-force, kilogram-force — with the lbs to newton converter's focused two-way pound-force and newton page, both built on 1 lbf = 4.4482216152605 N.Grams to Calories vs Meal Calorie CalculatorCompare grams-to-calories and meal calorie: one reconstructs calories from protein, carb, and fat grams, the other scales a known per-serving value by servings.Grams to Pounds vs Milligrams to PoundsCompare the grams-to-pounds and milligrams-to-pounds converters: the same exact avoirdupois pound factor applied from two metric scales, for food and postage versus lab samples and supplements.kg to lbs vs Pounds to KilogramsCompare the kg to lbs converter with the pounds to kilograms calculator: the exact 0.45359237 kg per pound relationship, what each one outputs, and which direction fits your source value.kg vs Stone Weight ConverterCompare the kilogram-to-stone converter with the stone-to-kilogram converter: the same 6.35029318 factor approached from each side, and which direction fits your source value.Newton Meter vs Lbs to Newton CalculatorCompare torque and force conversions: the newton meter calculator turns an N m torque into foot-pounds, inch-pounds, and kilogram-force units, while lbs to newtons converts pound-force to newtons and back.Pounds and Ounces vs Pounds to StoneCompare expressing a pound weight in ounces — combining pounds and ounces into total ounces, decimal pounds, and metric mass — with converting pounds to the 14-pound stone unit and back.Pounds to Stone vs Stone to lbs ConverterCompare the pounds to stone converter with the stone to lbs converter: the same exact 14 lb per stone factor approached from each side, and which direction fits your source value.Weight Converter vs kg to lbs ConverterCompare the weight converter's four-unit mass hub with the kg to lbs converter's focused kilogram-to-pound page: the same exact 0.45359237 kg per pound identity, different rounding and supporting output.

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