Annas to Paise: Decimalisation in 1957

How India changed from a rupee divided into annas and pice to a decimal system of 100 paise, and why decimal money simplified everyday transactions.

For centuries, the rupee was divided in a complicated way:

1 rupee = 16 annas.
1 anna = 4 pice (paise).
1 pice = 3 pies.

So a rupee equalled 192 pies. Calculating prices and change required careful arithmetic.

The switch

India adopted the decimal system on 1 April 1957. One rupee became 100 naya paise (“new paise”). The word “naya” was dropped in 1964.

Why decimalise?

Simpler arithmetic for prices, accounts and change.
Consistency with the metric system India was adopting for weights and measures.
Modernisation of the economy.

Transition

For a time, old and new coins circulated together, with conversion tables. People adapted gradually.

Legacy in language

The old units survive in everyday speech. Phrases like “solah aane sach” (sixteen annas true, meaning completely true) recall the anna system.

Later changes

As inflation reduced the value of small coins, many paise coins disappeared from use. The RBI withdrew coins below 50 paise from circulation in 2011.

Economic lesson

Simple, standard units reduce transaction costs and errors, making everyday trade easier.

The shopkeeper's arithmetic

Before 1957, a shopkeeper selling items at 3 annas 2 pice each had to work out totals in a base-16 system. After decimalisation, prices in rupees and paise made adding up far simpler.

Thinking the rupee has always had 100 paise

Before 1957, the rupee was divided into 16 annas, 64 pice or 192 pies.

Key takeaways

The old rupee was 16 annas, 64 pice or 192 pies.
India decimalised on 1 April 1957: 1 rupee = 100 naya paise.
Decimalisation simplified arithmetic and matched the metric system.
Coins below 50 paise were withdrawn in 2011.