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Calcimator

Double Tee Selection Calculator

Select the optimal PCI double-tee depth from clear span and superimposed load using industry load/span tables.

Inputs

ft
psf
ft
in

Results

Recommended DT depth

16 in

≈ 5 credit cards

DT self-weight47 psf
Total weight (with topping)47 psf
Total piece weight22,560 lbs
Max superimposed load75 psf
Span utilization100%
Load utilization66.7%
Governing utilization100%
Estimated camber1.33 in
How to Use This Calculator
  1. Enter the clear span in ft between supports and the total superimposed load in psf (live + SDL).
  2. Set the double-tee flange width in ft (common sizes: 8, 10, or 12 ft).
  3. Enter composite topping thickness in inches (0 for untopped, 2–4 in for composite systems).
  4. Read Recommended DT Depth (in) — the shallowest standard section that satisfies both span and load.
  5. Verify that Governing Utilization (%) is below 100% — above 100% requires a deeper or higher-strength section.
  6. Note Total Piece Weight (lbs) and Estimated Camber (in) for crane planning and floor levelness requirements.

How the result changes with Clear span

Clear spanRecommended DT depth
1312 in
4320 in
7834 in
10834 in

What each input means

Clear span
Clear span between supports in feet.
Superimposed load
Total superimposed load (live + SDL) in pounds per square foot.
DT width
Double-tee flange width (common: 8, 10, or 12 ft).
Composite topping
Cast-in-place composite topping thickness (0 if untopped).

What each result means

Recommended DT depth
Shallowest standard double-tee depth that satisfies span and load.
DT self-weight
Self-weight of the bare double tee.
Total weight (with topping)
Total dead weight including any composite topping.
Total piece weight
Total weight of one DT for crane pick planning.
Max superimposed load
Maximum superimposed load the selected DT can carry at this span.
Span utilization
Percentage of the DT's maximum span being used.
Load utilization
Percentage of the DT's load capacity being used.
Governing utilization
Higher of span or load utilization — should stay below 100%.
Estimated camber
Approximate initial camber (L/360) for the selected span.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Clear span = 40, Superimposed load = 50, DT width = 12, Composite topping = 0 = 4 input(s) provided
  2. Calculate Recommended DT depth
    Recommended DT depth = DT_TABLE[DT_TABLE.length - 1][0]
    16 = 16
  3. Calculate DT self-weight
    DT self-weight = DT_TABLE[DT_TABLE.length - 1][2]
    47 = 47
  4. Calculate Total weight
    Total weight = selectedSelfWeight + toppingWeight
    47 = 47

Engine last updated .

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