Meters and feet are the two most widely used units for measuring length in daily life. Meters dominate the metric world — most of the planet. Feet dominate the United States and a few other holdouts. Converting between them smoothly is useful for travelers, sports fans, scientists, engineers, and anyone reading a product spec. Here is the complete guide.

The exact conversion factor

1 meter = 3.28084 feet (exactly, by definition since 1959).

1 foot = 0.3048 meters (exactly).

These values are internationally agreed. They come from the international yard and pound agreement, which defined the foot as 0.3048 meters to eliminate confusion between slightly-different historical definitions.

Fast mental math

For quick estimates, use these shortcuts:

  • Meters to feet: multiply by 3.3 (or just by 3 for very rough estimates, then add 10%).
  • Feet to meters: multiply by 0.3 (or divide by 3.3).

Examples:

  • 5 m × 3.3 ≈ 16.4 ft (exact: 16.40 ft). ✓
  • 100 m × 3.3 ≈ 328 ft (exact: 328.08 ft). ✓
  • 6 ft ÷ 3.3 ≈ 1.82 m (exact: 1.83 m). ✓

For fast 3× mental math and the 10% add, a 20-meter pool becomes: 20 × 3 = 60, plus 10% (6) = 66 feet. Exact value: 65.6 feet. Good enough for casual conversations.

Common benchmark conversions

Memorize a few and you can triangulate almost anything:

  • 1 m = 3.28 ft (or ~3.3)
  • 2 m = 6.56 ft (about 6'7")
  • 10 m = 32.8 ft
  • 100 m = 328 ft (about a US football field, 100 yards = 300 ft)
  • 1 km = 3,281 ft (about 0.62 miles)

Human heights

Height is the most common place Americans encounter meters:

  • 1.50 m = 4'11"
  • 1.60 m = 5'3"
  • 1.70 m = 5'7"
  • 1.80 m = 5'11"
  • 1.85 m = 6'1"
  • 1.90 m = 6'3"
  • 2.00 m = 6'7"

Quick rule for height: 1.80 m is just under 6 feet. Every 10 cm is about 4 inches. Not quite precise, but memorable.

Sports and Olympics

Most international sports use meters:

  • 100 m sprint ≈ 328 ft ≈ 109 yards
  • 200 m ≈ 656 ft ≈ 219 yards
  • 400 m ≈ 437 yards (a quarter-mile is 440 yards)
  • 1500 m ≈ 0.93 miles (the "metric mile")
  • 5 km ≈ 3.1 miles
  • 10 km ≈ 6.2 miles
  • Marathon = 42.195 km ≈ 26.2 miles

Altitude and elevation

Airplane cruising altitudes are typically reported in feet in the US: 30,000 to 40,000 ft (9,144 to 12,192 m).

Mountain heights vary by source:

  • Mt. Everest: 8,848 m = 29,029 ft
  • Denali: 6,190 m = 20,310 ft
  • Mt. Whitney: 4,421 m = 14,505 ft

Construction and real estate

US construction uses feet. International and scientific contexts use meters. A 20-foot container is 6.1 m long. An 8-foot ceiling is 2.44 m high. A quarter-acre lot is about 1,012 m². (Area has a different conversion; more on that elsewhere.)

Millimeters, centimeters, and inches

Smaller units follow the same principle:

  • 1 inch = 25.4 mm (exactly) = 2.54 cm
  • 1 cm = 0.394 in (just under half an inch)
  • 1 mm = 0.0394 in

Monitor sizes (inches), bike frame sizes (centimeters), and medical dimensions all use this range.

Kilometers and miles

1 km = 0.621 mi. 1 mi = 1.609 km. For quick mental conversion: 10 km ≈ 6.2 mi, 100 km ≈ 62 mi. The half-and-half rule: 1 km ≈ 0.6 mi rough estimate.

When to use which

Use meters/cm for: scientific contexts, international sports, product dimensions in most of the world, most modern manufacturing.

Use feet/inches for: US construction, US real estate, aviation altitude, US-sold consumer products, height described in casual American conversation.

Use both for: product descriptions aimed at global markets, travel and tourism sites, sports records.

History behind the numbers

The foot has existed in dozens of slightly-different forms across history — Roman foot (296 mm), Parisian foot (324 mm), English foot (305 mm), and many regional variants. Each empire that wanted to measure things defined its own, leading to centuries of confusion at trade borders. The 1959 international yard and pound agreement finally locked one foot at exactly 0.3048 meters, ending the ambiguity. That's why the conversion factor isn't a round number — it's the compromise between the metric meter (defined scientifically since 1799) and the English foot (standardized centuries earlier).

The meter itself started as one ten-millionth of the distance from the North Pole to the equator along the Paris meridian — a definition that turned out to be slightly wrong when surveyed. The modern definition is fixed to the speed of light: the meter is how far light travels in 1/299,792,458 of a second. The foot inherits precision from that definition.

Common conversion mistakes

Easy traps to avoid:

  • Height "5'10\"": that's 5 feet plus 10 inches, or 70 inches total = 1.78 m. Not 5.10 m, not 5.10 feet.
  • Decimal feet: "5.5 ft" means five-and-a-half feet (66 inches), not five feet five inches.
  • Area and volume: 1 m² = 10.76 ft², not 3.28 ft². Length conversions square/cube for area/volume.
  • Floor numbering: a "2-meter" ceiling is 6'7" — too low for most US building codes, which mandate 7'6" (2.29 m) minimum.

GPS, phones, and mixed-unit life

Most smartphones let you choose units per-app or system-wide. The Weather app, Maps, Health, and Fitness all track length/distance and can all be switched between imperial and metric independently on iOS and Android. Travelers and expats often pick the system they grew up with for health (weight, height) and the local system for navigation (distance, elevation). Your running app's splits in miles while the road sign says kilometers is a normal 21st-century experience — the conversion tool above is for when the apps disagree.

Just convert it

Our length converter handles meters, feet, inches, yards, miles, kilometers, millimeters, and centimeters in any combination. Enter a value in one unit, get all the others. It is instant, accurate, and saves you from forgetting whether the conversion factor is 0.3048 or 0.348 or 3.28 or 3.48 when it matters. One click removes the whole category of unit-conversion errors.