Acceleration Converter

What is 1g in m/s² and ft/s²?

1g (standard gravity) equals exactly 9.80665 m/s², which is 32.174 ft/s² in imperial units. This is a defined constant — the internationally agreed acceleration due to Earth's gravity at sea level — so it never changes even though the real gravitational pull varies slightly with latitude and altitude. When you are sitting still, the ground pushes up on you with a force equivalent to 1g; everything you feel as "weight" is that 1g acting on your mass.

g-force is simply acceleration expressed as multiples of this constant, which is why it is so useful for describing how intense a motion feels. To convert any acceleration in m/s² into g, divide by 9.80665; to go back, multiply by it. So the 2g of a sharp aerobatic turn is 19.6 m/s², and the 9g limit for a fighter pilot is about 88.3 m/s².

How do you convert a 0–60 mph time into acceleration?

Divide 60 by the 0–60 time in seconds to get the average acceleration in mph/s, then convert. A car doing 0–60 mph in 5 seconds averages 12 mph/s, and multiplying by 0.44704 gives 5.36 m/s² — about 0.55g. You can check this against the tool: type 12 into the mph/s field and it returns 5.36448 m/s², 0.5470337 g, 17.6 ft/s² and 19.312 km/h/s. A hypercar doing 0–60 in 2 seconds averages 30 mph/s ≈ 13.4 m/s² ≈ 1.37g, briefly pressing you into the seat with more than your own body weight.

These are average accelerations across the whole sprint; the peak at launch is higher. For the top speeds those cars reach once the sprint is over, convert with the speed converter, and for the forces the acceleration generates on a given mass, use the force converter — since force = mass × acceleration.

How do I convert km/h/s to m/s²?

Divide km/h per second by 3.6 to get m/s², because 1 km/h equals 1/3.6 m/s. So a car reaching 100 km/h in 8 seconds averages 12.5 km/h/s, which is 3.47 m/s² or about 0.35g — a typical brisk figure for a family car. Manufacturers often quote 0–100 km/h times in Europe and 0–60 mph times in the UK and US; both describe the same physics, just measured against different target speeds.

What is a Gal and where is it used?

A Gal (galileo) equals 1 cm/s², or 0.01 m/s², and is used in geophysics to measure tiny variations in Earth's gravitational field. Earth's surface gravity of about 9.81 m/s² is 981 Gal, and instruments detect local anomalies from geology, altitude and even nearby mass down to the milliGal. It rarely appears outside gravimetry, but the converter includes it so survey and geophysics figures drop straight into everyday units.

How much acceleration can a human withstand?

Most people can tolerate 4–6g for a few seconds before g-induced loss of consciousness (g-LOC), when blood is pulled away from the brain. Trained fighter pilots wearing anti-g suits and using breathing techniques can sustain up to about 9g — roughly 88 m/s² — for short bursts. The direction matters too: humans handle "eyeballs-in" forward acceleration far better than the "eyeballs-down" force that drains blood from the head.

Very high g-forces are survivable if they last only milliseconds. Car crash-safety testing routinely references peaks of 30–50g, and the record for a survived deceleration is over 200g, because the human body can withstand enormous forces for an instant even though it cannot for a sustained one. This is why duration matters as much as magnitude when assessing whether an acceleration is dangerous — a distinction the raw number alone does not capture.