This tool converts between Thousand, Lakh, Million, Crore, Billion and Trillion instantly. It uses million as the base unit (so “1” in the calculator’s million field = one million), and converts by multiplying or dividing by the appropriate factor for the selected unit.

The simple rule
To convert from millions to billions, divide the number of millions by 1,000 (because 1 billion = 1,000 million). Conversely, to convert billions to millions multiply by 1,000. This single rule is the fastest way to switch between the two units.

Steps

1. Take the numeric value in the source unit (for example, 2,500 million).
2. Convert the source to the base (million) if needed. In our calculator the base is already million, so this step is done automatically.
3. Divide or multiply by the factor that links the source and target units.

Quick conversion table

• 1 Thousand = 0.001 Million
• 1 Lakh = 0.1 Million
• 1 Million = 1 Million (base)
• 1 Crore = 10 Million
• 1 Billion = 1,000 Million
• 1 Trillion = 1,000,000 Million
  Use these relationships to jump between any pair of units: convert to the base (million), then to the target.

Worked examples

• 500 Million → billions: 500 ÷ 1,000 = 0.5 Billion.
• 2,000 Million → billions: 2,000 ÷ 1,000 = 2 Billion.
• 3 Billion → millions: 3 × 1,000 = 3,000 Million.
• 25 Crore → millions: 25 × 10 = 250 Million.

Scientific notation and very large/small numbers

If you work with extremely large or tiny values, scientific notation keeps things tidy (e.g., 1.2e6 for 1,200,000). The same arithmetic applies: convert the mantissa/exponent to the base (million) then adjust the exponent when converting to billions (divide by 10³ → subtract 3 from the exponent). Many reference calculators offer a scientific-notation display option useful for data science, astronomy, or finance datasets.

Regional naming

Most modern English-language financial and scientific contexts use the short scale: 1 billion = 1,000 million. Historically and in some older documents the long scale was used where “billion” meant 1,000,000 million.

When converting numbers from historical sources or from documents in other languages, check which scale the author used. In contemporary calculators and reporting, the short scale is the default.

How this calculator handles input

• Commas and grouping symbols are ignored for the numeric calculation (they’re accepted for readability).
• Scientific notation (e.g., 1e6) is supported if you prefer that format.
• Negative values are allowed (useful for debts or negative balances).
• Extremely large or extremely small results may be shown in exponential form to preserve clarity. These behaviours match common online converters and make the tool robust for spreadsheets and pasted data.

Practical uses

• Finance: comparing a company’s revenue in millions to a country’s GDP in billions.
• Journalism: writing numbers clearly for readers who are unfamiliar with large units.
• Data cleaning: turning mixed-unit datasets into a single consistent unit before analysis.
• Education: showing students how scale and orders of magnitude relate. These scenarios are why quick, reliable converters are helpful in both professional and everyday contexts.

Common mistakes to avoid

• Mixing short and long scale definitions without checking the source.
• Forgetting to convert intermediate units (for example converting crore → million before going million → billion).
• Relying on truncated rounding when precision matters (use the full number during arithmetic, and round only for display). Following the two-step approach (convert to the base, then to the target) prevents most errors.

FAQs

Can I enter scientific notation?

A: Yes, the calculator accepts 1e6-style input for very large or small numbers.

Sources: Omni Calculator, AllMath, Dwello, TheCalculatorSite, Jugyah, UnitsConverters, Upstore, EverydayCalculation, Scanftree, and MeraCalculator.