Joist Span Calculator
Joist, spacing, and span
Span is the clear horizontal distance between the faces of the supports (beam, bearing wall, or ledger) — not the overall length of the board.
Results
2x10 Douglas fir-larch No. 2 joists at 16 in on center can span up to 15 ft 5 in (IRC Table R502.3.1(2)) — your 14 ft span is within that limit.
Maximum allowable span
15 ft 5 in
Your 14 ft span is within the tabulated maximum, with 1 ft 5 in to spare.
Uniform-load tables don't cover concentrated loads like a bathtub, stone countertop, or hot tub — those need added joists or an engineer's check.
Source table: IRC Table R502.3.1(2)
Maximum span (metric): 4.70 m
Smallest listed size for 14 ft at 16" o.c.: 2x10