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Convert Grain to Kilogram (gr to kg) instantly with accurate, readable results.
Use our Mass Unit Converter to convert between grams, kilograms, pounds, ounces, and other weight units instantly. Designed for cooking, science, fitness, and engineering needs, this unit conversion tool offers accurate results between metric and imperial systems. Whether you’re tracking body weight, measuring ingredients, or handling heavy machinery, our mass unit conversion calculator has you covered.
Grain (gr) — a small imperial and US customary unit of mass
It is defined as exactly 1/7000 of an avoirdupois pound; since 1 lb = 0.45359237 kg exactly, 1 gr = 64.79891 mg exactly. Used mainly for measuring bullets, gunpowder, arrows, and some pharmaceutical or historical masses.
- Symbol: gr
- System: Imperial and US customary unit for mass
- Exact relations: 1 gr = 1/7000 lb = 1/437.5 oz = 64.79891 mg
- Metric equivalents: 1 gr = 0.06479891 g ≈ 0.0000647989 kg
- Typical examples: a small bullet ~40 gr; a larger rifle bullet ~150 gr; an aspirin tablet was historically 5 gr.
Kilogram (kg) — the SI base unit of mass
It is defined by fixing the Planck constant at exactly 6.62607015×10⁻³⁴ J·s; together with the definitions of the meter and second, this sets the kilogram. Used worldwide for measuring mass in science, engineering, commerce, medicine, food, shipping, and everyday life.
- Symbol: kg
- System: SI base unit for mass
- Exact relations: 1 kg = 1000 g = 1,000,000 mg
- Imperial equivalents (derived from 1 lb = 0.45359237 kg exactly): 1 kg ≈ 2.20462 lb ≈ 35.27396 oz
- Typical examples: 1 liter of water ~1 kg; a laptop ~1.5 kg; an adult person ~70 kg.