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# Floor - Joist cost

The **Cost of Floor Joists** calculator computes the cost of lumber based on the unit price and the number of joists required for a floor based on the dimension of the room.

**INSTRUCTIONS: **Choose your preferred units and enter the following:

**(W)**width of the floor across joists**(L)**length of the floor parallel to the joists**(oC)**On-center- (
**uP**) Unit Price of a floor Joist board

**TOTAL PRICE: **The calculator computes the number of floor joist boards needed and applies the unit price to compute a total cost in U.S. dollars. However, this can be automatically converted into other currency units (e.g. Pesos) via the pull-down menu.

**ASSUMPTIONS:** this algorithm assumes that the following:

- the length of the area is less than or equal to the length of one joist. For spans greater than the length of one joist, a beam is often required and a second row of joists. This would double the number and cost of joists.
- the plate boards are approximately the same size as the joists.

### Unit Pricing

One should alway use local pricing for the unit price of a supply like lumber for floor joists. However, for convenience, the following prices were observed on the Internet and presented for your convenience

- PRICE of a 2x10x8 is $10.77
- PRICE of a 2x10x10 is $13.7
- PRICE of a 2x10x12 is $15.66
- PRICE of a 2x10x14 is $17.35
- PRICE of a 2x10x16 is $20.91
- PRICE of a 2x10x20 is $24.40
- PRICE of a 2x12x8 is $12.54
- PRICE of a 2x12x10 is $16.99
- PRICE of a 2x12x12 is $20.37
- PRICE of a 2x12x16 is $25.98
- PRICE of a 2x12x20 is $33.89

**Floor - Joist cost**, is used in 7 calculators.