Form of calf starter (CS) and fatty acid addition may affect total-tract starch digestion (TTSD) and concentration of fecal starch (FS), indicating differences in site and extent of TTSD. Our objective was to determine effects of form of CS and supplementation without (FA-) or with (FA+) a fatty acid blend (NeoTec5g, Provimi) on the relationship between FS and TTSD in calves to 4 mo of age. Male Holstein calves (n = 48; initial BW = 42 ± 0.7 kg, 2–3 d of age) were fed reconstituted whole milk powder (14% DM) at 0.66 kg of DM/d to 39 d, then 0.33 kg of DM/d to 42 d. Textured (TS) or pelleted (PS) CS were offered for ad libitum consumption from 0 to 56 d, then blended with 5% chopped grass hay from d 57–112. Starters contained 20% CP and 38–40% starch (DM basis). Calves were housed individually from d 0–56 and in pens (n = 4/pen) from d 57–112. Fecal starch and TTSD were measured at 4, 6, 8, 10, 13, and 16 wk using acid insoluble ash as digestion marker. Fecal starch increased with wk when calves were fed TS (2.1% to 7.2% of fecal DM at 4 and 8 wk, respectively; P < 0.05) but only increased from 4 to 6 wk in calves fed PS (1.2% to 4.7%). From 10 to 16 wk, FS did not change in calves fed PS, but increased (P < 0.05) with wk in calves fed TS. Differences in FS were independent of DM intake, which did not vary among treatments. Calves fed TS had similar TTSD at 4 and 6 wk (98.6%); however, at 8 wk, TTSD declined to 96.7% (P < 0.05). There was no change in TTSD in calves fed PS from wk 6–8. From wk 10–16, TTSD was greater or tended to be greater in calves fed PS (95.9 vs. 97.9%). Addition of FA blend improved TTSD (P < 0.04) from 4 to 8 wk, but had no effect on TTSD from 10 to 16 wk. Regression of TTSD on FS during 4–8 wk was: TTSD = 99.81 (±0.181) – 0.57 (±0.045) × FS – 0.17 (±0.261) × Form (0 = PS, 1 = TS) + 0.16 (±0.058) × (FS × Form); root mean square error (RMSE) = 0.624, R² = 0.84. During 10–16 wk the equation was: TTSD = 99.94 (±0.092) – 0.59 (±0.013) × FS; RMSE = 0.298, R² = 0.98. Form of CS influenced site and extent of starch digestion to 4 mo of age.