Estimate stories from building height using an assumed floor-to-floor height. Animated examples show equal floors, partial remainders, a taller lobby and roof features that change the estimate.
Open the feet to stories calculator · More Physics and Math videos
The calculation
Estimated stories = building height ÷ assumed floor-to-floor story height
Worked example
60 ft ÷ 10 ft/story = 6 stories; 60 ft ÷ 12 ft/story = 5. A 75 ft stack at 12 ft/story gives 6.25 model layers with 3 ft remaining. A 78 ft stack with an 18 ft lobby and 12 ft upper stories gives 1 + (78 − 18)/12 = 6.
All story heights are example assumptions, not universal standards. A decimal model result is not proof of a fractional usable story. Use actual building plans for an exact count.
Video chapters
- 0:00 — Same height, different story counts
- 0:08 — Distance versus count
- 0:17 — Floor-to-floor height
- 0:31 — Build the estimation formula
- 0:42 — Worked example: 60 feet at 10 feet per story
- 1:01 — Keep height fixed; change story height
- 1:19 — A remainder is not a usable floor
- 1:35 — Allow for a taller lobby
- 2:02 — Check the roof measurement
- 2:11 — State the assumption with the answer
Read the full transcript
How many stories is a sixty-foot building? Six? Five? Both can be reasonable estimates. The missing piece is the height of each story.
Feet measure distance. Stories count building levels. So there is no single, fixed conversion between them. You need a height per story, based on the building you are estimating.
Think of a building as a stack of layers. Measure each layer from one finished floor to the next. That is floor-to-floor height. It includes the room and the space taken up by the floor structure above. Ceiling height alone leaves part of that layer out.
For equal-height stories, the calculation is simple: estimated stories equals building height divided by height per story. Keep both heights in the same units.
Start with sixty feet and assume ten feet per story. Each ten-foot layer adds one story. Ten, twenty, thirty, forty, fifty, sixty. Six layers fit, so sixty divided by ten equals six stories. Check it in reverse: six times ten feet is sixty feet.
Now keep the building sixty feet tall, but make each story twelve feet high. Only five layers fit. Sixty divided by twelve equals five. More height per story means fewer stories in the same total height. Ten feet is an assumption, not a universal standard.
What if the answer is a decimal? Seventy-five feet divided by twelve gives six point two five. That is six full twelve-foot layers, with three feet left over. It does not prove the building has a quarter of a usable story.
Real buildings may have a taller lobby. Suppose a seventy-eight-foot stack has one eighteen-foot lobby and twelve-foot stories above it. Subtract the lobby first: seventy-eight minus eighteen leaves sixty feet. Divide by twelve to get five upper stories. Then add the lobby back: six stories in total. Dividing the entire height by twelve would miss that taller first layer.
And check what your total height includes. A roof feature can add feet without adding another occupied level. Use measurements that match the floors you are counting.
The method is: define the height, choose a defensible height per story, then divide. State the assumption with the answer. For an exact story count, use the building plans.