Units of Measure in Takeoffs (LF, SF, SY, SQ, CY, EA, LS)
LF, SF, SY, SQ, CY, EA and LS: what each takeoff unit counts and when to use it.
Quick Answer
Takeoff units are the standard measures estimators price by: LF (linear feet) for length, SF (square feet) and SY (square yards) for area, SQ (square, 100 SF) for roofing and siding, CY (cubic yards) for volume, EA (each) for counts, and LS (lump sum) for work priced as one item.
The Full Picture
Every line of a takeoff needs a unit, because the unit is what links a quantity to a price. Length items such as trim, pipe, curb and conduit are taken off in LF (linear feet). Area items such as drywall, flooring and sheathing are in SF (square feet). Volume items such as concrete, excavation and fill are in CY (cubic yards), which is 27 cubic feet. Items that are simply counted, such as doors, fixtures and lights, are EA (each).
Some units exist because the trade prices that way. A SQ (square) is 100 SF and is the usual unit for roofing, and often for siding. A SY (square yard) is 9 SF and is common for paving, plaster, carpet and some earthwork surfaces. LS (lump sum) means a scope is priced as one figure, such as mobilization, a permit allowance or a subcontractor's all-in bid, with no quantity behind it. Heavy items such as steel and rebar are often taken off by weight (tons or pounds), and lumber by MBF, which is 1,000 board feet.
Most unit errors come from conversion and from mixing the measured quantity with the priced one. A roof takeoff is measured in SF of actual surface, not plan footprint, and divided by 100 to get squares. A paving price in dollars per SY applied to an SF quantity is off by a factor of nine. Concrete measured in cubic feet but priced per CY is off by twenty-seven. Waste, laps and overlaps are usually carried either in the quantity or in the unit price, and an estimator should make sure it is only counted once.
Units are defined where the estimate is built, not just in the drawings. Specs and bid forms often name the unit that bidders must use, particularly for unit-price contracts. A good takeoff states its unit, what is included in the quantity (for example, openings deducted or not) and what is carried separately, so the person pricing it, whether in-house or a subcontractor, uses the same basis. The NIST guide to SI units and its unit-conversion tables are the reference when a project mixes US customary and metric units.
Real Examples
Common Misconceptions
People assume: A square is a square foot.
Actually: In roofing, a SQ is 100 square feet. Pricing a 100 SF area as one SF, or the reverse, is a hundredfold error. Always check whether a price is per SF or per SQ.
People assume: A lump sum means no takeoff is needed.
Actually: LS is a pricing basis, not an excuse to skip scope. A lump-sum line still needs a defined scope, inclusions and exclusions, or it hides gaps that surface later as change orders.
Does MeltPlan Solve This?
Yes — direct fitGetting quantities into the right unit is part of every takeoff. MeltPlan's takeoff service has AI pull quantities from plans and US-based experienced estimators review and adjust them, so the result is a verified, ready-to-use takeoff. It works from PDF plans, not BIM models.
Get takeoff quantities in the units you price by →Frequently Asked Questions
What does LF mean in construction?
LF means linear feet, a length measure. It is used for items priced by length, including trim, baseboard, pipe, conduit, curb, fencing and footings, and is often what a takeoff reports for wall length.
How many square feet are in a SQ?
One SQ (roofing square) is 100 square feet. Roofing is bought and priced per SQ, so a 3,354 SF surface is 33.54 SQ before any waste is added.
How many square feet are in a square yard?
One SY is 9 square feet, a 3 ft by 3 ft area. Divide an SF quantity by 9 to get SY. It is common for paving, plaster and carpet.
What does LS mean on a bid?
LS means lump sum: a single price for a defined scope of work, with no unit quantity or unit price behind it. The scope description and exclusions matter more than the number.
When is EA used instead of LF or SF?
EA means each and is used when items are counted individually, such as doors, fixtures, outlets, valves or rebar supports, regardless of their size or length.