Converting 5'7" to centimeters gives you 170.18 cm. If you need a rounded figure for quick clothing choices or casual forms, 170 cm works well. This measurement bridges imperial units used in the United States with the metric system relied upon by the rest of the world.
Whether you're filling out international travel documents, shopping for apparel online, or checking medical charts, knowing the exact math behind this height saves time and avoids errors. Let's break down the conversion, examine how it applies across different industries, and look at common pitfalls when dealing with foot and inch measurements.
The Math Behind 5 Feet 7 Inches in Centimeters
The calculation relies on fixed international standards established in 1959 by the National Institute of Standards and Technology and partner laboratories, which set one inch at exactly 2.54 centimeters.
To convert any height given in feet and inches into centimeters, use these steps:
- Convert feet to inches: Multiply the number of feet by 12. For 5 feet, that's $5 \times 12 = 60$ inches.
- Add the remaining inches: Take your subtotal and add the extra inches. Here, $60 + 7 = 67$ total inches.
- Multiply by the metric factor: Multiply the total inches by 2.54. That's $67 \times 2.54 = 170.18$ centimeters.
If you prefer working with meters, move the decimal point two places to the left, which gives you 1.7018 meters.
Common Conversion Mistakes to Avoid
People often make quick mental math errors when shifting between imperial and metric scales. Watch out for these traps:
- Forgetting the base-12 rule: A common mistake treats feet like decimals, assuming 5.7 feet means 5 feet and 7 inches. In reality, 0.7 of a foot is about 8.4 inches ($0.7 \times 12$), making 5.7 feet equal to 5 feet 8.4 inches instead of 5'7".
- Over-rounding too early: If you round 2.54 to 2.5 right at the start of a multi-step calculation, your final number drifts off by a full centimeter or more. Always apply the exact factor until the final step.
- Confusing meters and centimeters: Mistaking 170.18 cm for 17.0 cm or 1,700 cm happens when typing fast on digital forms. Double-check your decimal placement.
Real-World Context and Practical Applications
Height data isn't just a number on a driver's license; it drives design, medicine, and retail.
Healthcare and Body Mass Index
Medical professionals rely on precise metric measurements to calculate Body Mass Index (BMI), body surface area, and pediatric growth curves. If you visit a clinic outside North America, the nurse will immediately log your height as 170 cm or 1.70 meters. Precise entry ensures correct drug dosing—especially in chemotherapy or critical care where patient surface area dictates the dose.
Ergonomics and Apparel Sourcing
Global clothing manufacturers use metric sizing grids based on ISO standards. When you order jackets, trousers, or bespoke suits from international suppliers, sleeve lengths and torso drops factor in your height in centimeters. At 170.18 cm, you sit right in the middle of standard medium-to-large sizing tiers depending on the brand's specific block pattern.
Aviation and Athletic Screening
Athletic scouts and aviation medical examiners often require metric records for cross-border competitions or commercial pilot licensing. Standardizing on centimeters removes ambiguity between regional variations of the "foot" used historically in different legal systems.
Frequently Asked Questions
Is 5'7" considered tall, short, or average?
It depends entirely on geography and gender. In the United States, 5'7" is right around the average height for an adult male, while it sits above the average height for an adult woman. Globally, averages vary widely based on regional nutrition, genetics, and healthcare access.
Should I round 170.18 cm to 170 cm?
For casual use, yes. Most people round to the nearest whole number (170 cm) or half-centimeter. For engineering, medical device fitting, or precise tailoring, keep the full decimal value.
How do I convert centimeters back to 5'7"?
Divide your centimeter measurement by 2.54 to get total inches (170.18 / 2.54 = 67 inches). Then divide by 12 to find the feet (67 / 5 = 5 with a remainder of 7), giving you 5 feet 7 inches.
Why do some countries still use feet and inches?
Tradition and historical adoption play the largest roles. The United States, Liberia, and Myanmar are among the very few nations that retain the imperial system for everyday public use, while scientific and industrial sectors in those regions still use metric units.
