UK Coin Weight Calculator
Enter the number of coins you have for each UK denomination (1p, 2p, 5p, 10p, 20p, 50p, £1, £2) and instantly see the total weight in grams and kilograms alongside the total monetary value. Useful for postal coin bags, coin counting, treasure hunts, or knowing how much your piggy bank weighs before taking it to the bank.
Combined weight of all your coins
67.8 g
total£1
64.6%
£2
35.4%
- 1
Coins entered
5 £1, 2 £2 = 7 - 2
Total weight (Σ count × g per coin)
5 × 8.75 + 2 × 12 = 67.75Each denomination has a fixed weight per Royal Mint 2024 specification.
How does this calculator work?
Total weight of UK coins = Σ(count × per-coin weight). Royal Mint 2024 weights: 1p = 3.56 g, 2p = 7.12 g, 5p = 3.25 g, 10p = 6.50 g, 20p = 5.00 g, 50p = 8.00 g, £1 = 8.75 g, £2 = 12.00 g. Enter coin counts to get total grams and pounds–pence value simultaneously.
Formula
How this is calculated
Each UK coin has a fixed weight specified by the Royal Mint and fixed in the Coinage Act. The weights used here are the 2024 Royal Mint specifications: 1p = 3.56 g, 2p = 7.12 g, 5p = 3.25 g, 10p = 6.50 g, 20p = 5.00 g, 50p = 8.00 g, £1 = 8.75 g, £2 = 12.00 g. These values apply to all coins currently in circulation; pre-decimal or older cupro-nickel coins (pre-1992 1p/2p, pre-1990 5p/10p) have different weights.
Total weight is simply the sum of each count multiplied by its per-coin weight. Total monetary value is the sum of each count multiplied by the face value in pence. The calculator shows the weight breakdown in the donut chart so you can see which denominations contribute most to the total mass.
Note that worn coins may be fractionally lighter than the specification due to metal loss, and foreign coins mixed in will not match UK weights. Specifications are correct as of 2024; the Royal Mint occasionally updates alloys and dimensions for new coin generations.
Frequently asked questions
A £2 coin (12.00 g) is bimetallic — it has a nickel-brass outer ring and a cupro-nickel inner disc — which adds diameter and thickness. The £1 coin (8.75 g) is also bimetallic but smaller. More metal means more weight, which also acts as a practical anti-forgery measure alongside the complex edge lettering and the two-colour design.
£100 in 1p coins = 10,000 × 3.56 g = 35.6 kg. In 2p coins = 5,000 × 7.12 g = 35.6 kg. In £1 coins = 100 × 8.75 g = 875 g. In £2 coins = 50 × 12.00 g = 600 g. Carrying £100 in pennies requires a very strong bag — it weighs more than most pieces of luggage!
Only if you know the mix. A bag of pure £1 coins weighs 8.75 g per coin, so a 1 kg bag holds about 114 × £1 = £114. But a random mix of denominations has a different average weight per coin; this calculator is most useful when you know the counts per denomination.
Also known as
TG we-Calculate Editorial Team. (2026). UK Coin Weight Calculator [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/uk-coin-weight-calculator
TG we-Calculate Editorial Team. "UK Coin Weight Calculator." TG we-Calculate. 2026. https://we-calculate.com/calculator/uk-coin-weight-calculator.
TG we-Calculate Editorial Team, "UK Coin Weight Calculator," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/uk-coin-weight-calculator
@misc{wecalculate_uk_coin_weight_calculator, title = {UK Coin Weight Calculator}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/uk-coin-weight-calculator}}, year = {2026}, note = {TG we-Calculate} }
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