UK Coin Weight Calculator

Work out the total weight, face value, and coins per kilogram for a stack of UK coins, using the Royal Mint's official per-coin specification weights.

Quick Facts

Formula
Total weight = quantity × official coin weight
Current Royal Mint specification weights range from 3.25g (5p) to 12.00g (£2).
Materials
Plated steel, cupro-nickel, or bi-metallic
1p/2p are copper-plated steel, 5p/10p are nickel-plated steel, 20p/50p are cupro-nickel, and £1/£2 are bi-metallic.

Your Results

Calculated
Total weight
-
Quantity × official coin weight
Weight per coin
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Royal Mint specification
Total face value
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Quantity × denomination value
Coins per kilogram
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1000g ÷ weight per coin

Ready

Choose a coin, enter a quantity, and press Calculate.

How the UK Coin Weight Calculator works

This tool answers a simple, concrete question: how much does a given number of UK coins weigh, and what is that stack worth? It multiplies the quantity you enter by the Royal Mint's published specification weight for the denomination you choose — the same figures the Mint uses to define legal coin production.

The formula

The calculation has three steps:

Total weight = quantity × weight per coin
Total face value = quantity × denomination value
Coins per kilogram = 1000g ÷ weight per coin

The result is then converted from grams into kilograms, ounces (÷ 28.3495), or pounds (÷ 453.592) if you select a different display unit. No rounding, wear allowance, or packaging weight is added — this is the pure as-minted specification.

Official Royal Mint coin weights

These are the current specification weights used by the calculator for coins in circulation today:

  • 1p — 3.56g, copper-plated steel, 20.3mm diameter
  • 2p — 7.12g, copper-plated steel, 25.9mm diameter
  • 5p — 3.25g, nickel-plated steel, 18.0mm diameter
  • 10p — 6.5g, nickel-plated steel, 24.5mm diameter
  • 20p — 5.0g, cupro-nickel, 21.4mm diameter, 7-sided
  • 50p — 8.0g, cupro-nickel, 27.3mm diameter, 7-sided
  • £1 — 8.75g, bi-metallic (nickel-brass outer, nickel-plated alloy inner), 23.43mm diameter, 12-sided
  • £2 — 12.0g, bi-metallic (nickel-brass outer, cupro-nickel inner), 28.4mm diameter

Worked example

Take 100 x 50p coins. Total weight is 100 × 8.0g = 800g (0.8kg), total face value is 100 × £0.50 = £50.00, and since one kilogram holds 1000 ÷ 8.0 = 125 coins of that denomination, 800g of 50p coins is 100 coins out of that 125-per-kg reference rate.

What moves the result

  • Denomination: weight per coin ranges from 3.25g (5p) to 12.00g (£2) — nearly a 4x spread — so the same quantity of different coins gives very different totals.
  • Quantity: total weight and total value both scale linearly with the number of coins entered.
  • Display unit: only changes how the total weight is presented (g, kg, oz, or lb); it does not change the underlying gram figure used for the other results.

What this calculator does not cover

This is a specification-weight calculator, not a scale reading. It does not account for wear on circulated coins, dirt or corrosion, or coins outside current circulation — for example the round £1 coin (9.5g) withdrawn in October 2017, or the larger pre-1990/1992 cupro-nickel 5p and 10p coins. If you are weighing real coins on a scale, expect small variance from these as-minted figures, especially on older or heavily circulated pieces.

Frequently Asked Questions

What are the official weights of UK coins?
The Royal Mint's current specifications are: 1p = 3.56g, 2p = 7.12g, 5p = 3.25g, 10p = 6.5g, 20p = 5.0g, 50p = 8.0g, £1 = 8.75g, and £2 = 12.0g. This calculator multiplies the quantity you enter by exactly these official per-coin weights.
How is the total weight calculated?
Total weight equals quantity multiplied by the weight of one coin. For example, 100 one-penny coins weigh 100 × 3.56g = 356g. The same multiplication applies to any denomination and quantity, and the result is then converted into grams, kilograms, ounces, or pounds as selected.
Why would I need to know how much a stack of coins weighs?
Coin weight is useful for practical tasks such as estimating postage before mailing coins, sizing a coin jar or money box, sanity-checking a bank or supermarket coin-counting machine's total, or working out roughly how many coins are in a bag before counting them by hand.
Does wear, dirt, or age change a coin's weight?
This calculator uses the Royal Mint's as-minted specification for coins currently in circulation. A circulated coin can lose a very small amount of weight through wear, and dirt can add a negligible amount, so a kitchen scale may show tiny variance. Older coins outside current circulation, such as the round pound withdrawn in 2017, had different weights and are not covered by this tool.

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