Real GDP

Also called: GDP at constant prices · Topic: National Income Accounting: GDP, GVA and Welfare · NCERT: Class 12, Ch 2 "National Income Accounting"

Meaning

Real GDP (also called GDP at constant prices) is the value of all final goods and services produced in a year, priced at the prices of one fixed base year (a reference year chosen for comparison). Because prices are held fixed, real GDP changes only when the amount of production changes.

• Formula: Real GDP = Σ (this year's quantity × base-year price)
• Link with nominal GDP: Real GDP = Nominal GDP ÷ (GDP deflator ÷ 100)

Why it matters:

• Nominal GDP in ₹ can go up just because prices went up.
• Real GDP removes that price effect. It shows whether the economy actually produced more.
• Economic growth means a sustained rise in real national income. A rise that comes only from higher prices is not growth.

Explanation

1. Why we need real GDP

• Money value = quantity × price. So GDP in ₹ can rise for two reasons:
• more goods and services were produced (quantity went up), or

• the same goods became costlier (price went up).

• If the ₹ figure doubles, we cannot tell which of these happened.

• The fix: value every year's output at the same base-year prices. Then any change left over is a change in volume only.
• MoSPI's bicycle example [3]:
• Year 1: 100 bicycles at ₹1,000 each = ₹1,00,000.
• Year 2: the same 100 bicycles at ₹1,100 each = ₹1,10,000.
• GDP "looks" 10% higher. But real growth is 0%, because no extra bicycle was made.

2. How real GDP is calculated (NCERT Class 12 bread example)

Year	Output	Price	Nominal GDP	Real GDP (2000 prices)
2000 (base)	100	₹10	₹1,000	₹1,000
2001	110	₹15	₹1,650	₹1,100

• Nominal GDP 2001 = 110 × ₹15 = ₹1,650. This uses that year's own price.
• Real GDP 2001 = 110 × ₹10 = ₹1,100. This uses the base-year price.
• Nominal growth = (1,650 − 1,000) ÷ 1,000 = 65%.
• Real growth = (1,100 − 1,000) ÷ 1,000 = 10%. This is the true rise in bread output.
• The rest of the gap comes from higher prices.
• In the base year, nominal GDP = real GDP (₹1,000 = ₹1,000), because current prices and base prices are the same.

3. Real GDP, the GDP deflator and growth

• GDP deflator (a price index covering all goods and services in GDP) = (Nominal GDP ÷ Real GDP) × 100.
• Bread example: 1,650 ÷ 1,100 = 1.5 (150%). Bread prices rose 1.5 times.

• In the base year the deflator is always 100.

• Going from nominal to real: nominal GDP ₹500 crore and deflator 125 give real GDP = 500 ÷ 1.25 = ₹400 crore.

• Real growth rate = (Real GDP this year − Real GDP last year) ÷ Real GDP last year × 100.
• Rule of thumb: nominal growth ≈ real growth + deflator inflation.
• The exact relation is (1 + nominal growth) = (1 + real growth) × (1 + deflator inflation).

• The simple sum works only when the rates are small. In the bread example, 1.65 = 1.10 × 1.50 holds exactly, but 10% + 50% gives only 60%, not 65%.

• What makes real GDP rise or fall: only a change in the volume of output, for example more workers, more machines, better technology, or a good or bad harvest. A change in prices alone does not move it.

4. How prices are removed in practice: single vs double deflation

• Deflating means dividing a ₹ value by a price index to strip out the price rise. MoSPI uses price indices such as CPI and WPI as deflators, item by item [3].
• Single deflation: one price index (usually the output price) is used to deflate value added directly.
• Double deflation: output is deflated by an output price index and inputs by a separate input price index. Then real GVA = real output − real inputs.
• Worked example:
• Output ₹120, inputs ₹80, so nominal GVA = ₹40.
• Output prices rose 20% (index 1.2). Input prices did not change (index 1.0).
• Double deflation: real output = 120 ÷ 1.2 = 100; real inputs = 80 ÷ 1.0 = 80; real GVA = ₹20.
• Single deflation: 40 ÷ 1.2 = ₹33.3.
• Single deflation overstates real value added here, because input prices and output prices moved differently.

In India

• Who measures it: the National Statistics Office (NSO) under MoSPI. In official releases, "GDP at constant prices" is simply another name for real GDP [2].
• Base years: 2004-05 → 2011-12 (introduced January 2015) → 2022-23.
• The new 2022-23 series was released on 27 February 2026 [4][3].
• GDP of the base year 2022-23 (new series) = ₹261.18 lakh crore [4].
• 2022-23 was picked as a "normal" year. The GST rollout (2017) and COVID-19 (2020-21, 2021-22) ruled out 2017-18 to 2021-22. The choice was recommended by the Advisory Committee on National Accounts Statistics (ACNAS), set up in 2024 [3].

• MoSPI aims to revise the base about every five years [3].

• Latest figures (2025-26, Provisional Estimates, at constant 2022-23 prices) [2]:

• Real GDP: ₹323.12 lakh crore, against ₹299.89 lakh crore in 2024-25.
• Real GDP growth: 7.7% (2025-26), 7.1% (2024-25, First Revised Estimate), 7.2% (2023-24).
• Nominal GDP growth: 8.9%. So implied deflator inflation was only about 1.1%.
• Real GVA growth: 7.9% (2025-26), against 7.3% (2024-25).

• Sector-wise real GVA growth: primary 3.2%, secondary 8.8%, tertiary 9.3%.

• How the new series removes prices [3]:

• Single deflation has been completely removed.
• Double deflation is used in manufacturing and agriculture.
• Single extrapolation (moving base-year real values forward with volume indicators) is used in other sectors.
• More than 300 item-level price indices are used as deflators.

• The WPI (still on base 2011-12) stays in use for now. The PPI (Producer Price Index, being prepared by DPIIT) will be added once it is released.

• Back series: past GDP recalculated with the new methods is expected by December 2026. It will be extended back to 1950-51 by splicing (joining the old and new series) [3]. Until then, growth rates from the old and new series cannot be compared directly.

• Standards: India follows SNA 2008 (the UN System of National Accounts) and plans to move to SNA 2025 at the next base revision [3].

Don't confuse with

• Nominal GDP: valued at current-year prices, so it moves with both quantity and price. Real GDP uses base-year prices and moves with quantity only.
• GDP deflator: a price index (Nominal ÷ Real × 100), not a measure of output. A deflator below 100 (e.g. NCERT's 83.3%) means prices fell since the base year. It does not mean real GDP fell.
• Real GVA: value of output minus inputs, at constant prices. GDP = GVA + taxes on products − subsidies on products [3]. Sector-wise growth is reported as real GVA, and headline growth as real GDP (7.9% vs 7.7% in 2025-26) [2].
• Welfare / well-being: real GDP measures the volume of output, not how evenly it is shared or how well people live.

Prelims Hooks

• Real GDP = output at constant (base-year) prices. It is the only measure that isolates changes in the volume of production.
• In the base year, nominal GDP = real GDP, and the GDP deflator = 100.
• Trap: if nominal GDP rises 10% and prices also rise 10%, real growth is about 0% (MoSPI's bicycle example) [3].
• Current GDP base year: 2022-23, released by MoSPI's NSO on 27 February 2026. The earlier series used 2011-12 (introduced January 2015) [4][3].
• Real GDP growth 2025-26 (PE): 7.7%. Nominal growth was 8.9% and real GVA growth 7.9% [2].
• The new series has no single deflation. Double deflation is used in manufacturing and agriculture [3].

Mains Points

• Strong real growth, weak nominal growth: the fiscal squeeze
• In 2025-26 real growth was 7.7% but nominal growth only 8.9%, because deflator inflation was about 1.1% [2].
• Tax revenue, the fiscal deficit ratio and the debt-to-GDP ratio are all worked out on nominal GDP.

• So low inflation can hold back revenue and make fiscal ratios look worse, even when real output is growing fast. This matters for budget planning (GS-III).

• Is real growth measured correctly?

• Critics said the old single deflation using WPI (which has no services) overstated real growth when input prices fell sharply.
• The 2022-23 series replies with double deflation, 300+ item-level indices and Supply and Use Table checks [3].

• Gaps remain: WPI still has base 2011-12, the PPI is awaited, and deflators for services are still weak.

• Real growth is not the same as inclusive growth

• In 2025-26 primary real GVA grew 3.2% while services grew 9.3% [2].
• Agriculture still supports a large share of workers, so the headline 7.7% hides uneven income gains. This links to inclusive growth and farm distress (GS-III).

Related concepts

• Nominal GDP
• Current prices
• Constant prices
• Real growth rate
• Real national income

Read more

• Nominal vs real GDP and measuring growth