How do I convert gigabytes to terabytes by hand?

Use TB = GB × 0.001. The step-by-step panel shows the same calculation with your own numbers substituted in.

Is the answer exact or rounded?

The calculation itself uses the full stored precision of the defined factor. Only the displayed figure is rounded, and the page also shows a shorter everyday value beside the full one.

Can I check the conversion the other way round?

Yes. The result panel converts the answer straight back into your original unit so you can confirm nothing was lost.

Can I download the result?

Yes — the PDF button produces a branded report with your input, the answer, the formula and the full working.

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Unit Conversions & Measures

Gigabytes to Terabytes Converter

Convert gigabytes to terabytes with the exact factor, the working shown step by step and a plain-English explanation.

Your inputs

Change any value to update the result instantly.

Unit Conversions & Measures

Value in gigabytes

Terabytes

0.1 TB

Conversion factor

1 GB = 0.001 TB

Value in byte (internal base unit)

100,000,000,000 B

Reverse conversion check

0.1 TB = 100 GB

Rounded for everyday use

0.1 TB

What this calculator does

Converts a measurement given in gigabyte (decimal)s into terabyte (decimal)s using the defined conversion factor.

What your result means

The same quantity expressed in TB instead of GB. Nothing about the measurement itself changes.

Formula and working

TB = GB × 0.001

1
Start with your value
100 GB
2
Convert to byte
100 × 1,000,000,000 = 100,000,000,000 B
3
Convert into terabytes
100,000,000,000 ÷ 1.0000e+12 = 0.1 TB
4
Result
100 GB = 0.1 TB

Frequently asked questions

Symbols and assumptions

GB: Input unit — gigabyte (decimal)
TB: Output unit — terabyte (decimal)
B: Base unit used internally for digital storage

• Both units measure digital storage, so the physical quantity is unchanged by the conversion.
• The relationship is exactly linear: 1 GB = 0.001 TB.
• Values are converted through the SI base unit for this quantity rather than pair by pair.

Sources and review

Reviewed 2026-09-22 · Next review 2027-09-22

IEC 80000-13 — Information science and technology: binary prefixes for units of informationInternational Electrotechnical Commission The International System of Units (SI Brochure), 9th editionBureau International des Poids et Mesures · 9th edition

• A unit conversion changes how a number is expressed, not how it was measured — the answer can never be more accurate than the value entered.
• Displayed figures are rounded for readability; the full stored precision of the TB value is used in every onward calculation.

Important limitation

This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.

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