A worked example: five real shifts across a work week
Running five daily shifts through the Time Card Calculator gives: Monday (09:00-17:30, 30-minute break) at 8 net hours, Tuesday (same shift) at 8 net hours, Wednesday (08:30-20:00, 45-minute break) at 10.75 net hours, Thursday (same as Monday) at 8 net hours, and Friday (09:00-18:00, 30-minute break) at 8.5 net hours. Summed across the week, that's 43.25 net hours worked.
The formula: feeding one day's time card into the overtime split
Wednesday was the outlier — the only shift that ran noticeably long. Taking that exact same clock-in (08:30), clock-out (20:00), and 45-minute break and entering them into the Overtime Hours Calculator, with an 8-hour standard day, recomputes the total from scratch and gets 10.75 total hours — matching the Time Card Calculator's netHours output for that same shift exactly — then splits it into 8 regular hours and 2.75 overtime hours.
Why the two totals matched exactly
Both calculators compute a shift's duration the same way under the hood: gross time from clock-in to clock-out (adding a day if clock-out wraps past midnight), minus the unpaid break, in hours. Because that underlying arithmetic is identical, entering the same clock-in, clock-out, and break into either calculator always produces the same total-hours figure — the Time Card Calculator just stops there, while the Overtime Hours Calculator takes that total one step further and compares it against a standard-hours threshold.
Why a single day's split beats eyeballing a weekly total
Running all five days through the Overtime Hours Calculator at the same 8-hour standard shows the overtime wasn't spread evenly at all: Monday, Tuesday, and Thursday each landed at exactly 8 total hours with 0 overtime, Friday's 8.5 total hours produced 0.5 overtime hours, and Wednesday's 10.75 total hours produced 2.75 overtime hours — 3.25 overtime hours for the week in total, almost all of it concentrated in that one long Wednesday shift. A weekly total of 43.25 hours on its own doesn't show that; only checking each day's shift against the standard-hours threshold does.