Methodology: Round vs Exact Time Exposure Calculator

What this calculator gives you

This calculator compares exact paid minutes to rounded paid minutes for a sample week, then turns the difference into a dollar figure you can scale across employees and workweeks.

Use it when you already capture punches (or daily totals) and want a clear answer to: If we keep rounding this way, how much money is at stake versus paying exact time?

The basic method

For each worked day in the sample week:

1. Compute exact minutes from clock-in to clock-out (or use the exact minutes you enter).
2. Apply the selected rounding interval to the gross shift (in-to-out span), then subtract unpaid break minutes — the same order as the time card calculator.
3. Sum exact minutes and rounded minutes across the week.
4. Difference = rounded total − exact total. Negative means rounded pay is short of exact (underpay exposure). Positive means overpay.
5. Scale dollars:

sample-week $ = (difference minutes ÷ 60) × hourly rate

annual exposure $ = |difference minutes| ÷ 60
                    × hourly rate
                    × employees
                    × sample weeks per year

The annual figure is a magnitude. Labels and copy say whether the sample pattern underpays or overpays.

A concrete underpay example

Default scenario: five workdays, clock-in 8:53 AM, clock-out 5:00 PM, 30-minute unpaid lunch, 15-minute rounding, $25/hour, 50 employees, 52 weeks.

That weekly shortfall is only about 35 minutes per person. Scaled across a full workforce and year, it is a material payroll number — and a signal to audit real punch data, not only the written policy.

What the 7-minute rule means here

Quarter-hour rounding is often called the 7-minute rule. This calculator uses standard half-interval rounding (Math.round to the nearest 15 minutes):

• 7 minutes past a boundary → rounds down
• 8 minutes past a boundary → rounds up

The midpoint at 7.5 minutes rounds away from zero under JavaScript’s Math.round, which matches common payroll practice for positive durations.

The name is a convention for applying the federal quarter-hour interval in 29 CFR §785.48(b). It is not a separate statute.

Rounding intervals offered

Federal law allows these practices only when they do not, over time, fail to pay employees for all time actually worked. A formula can look neutral and still fail if real punches cluster on one side of the midpoint (for example, consistent early clock-ins that round away from paid time).

Two input modes

Clock in / out is the primary model. It rounds the gross shift, then subtracts break — closest to how the companion time card calculator and many payroll systems treat a single daily span.

Daily minutes is a shortcut when you only know net worked minutes per day. It rounds that day total to the interval. Treat it as an estimate; prefer punch times when you have them.

Why “neutral on paper” is not enough

Federal neutrality is a results test over time, not a font check on the handbook. See's Candy Shops, Inc. v. Superior Court (California Court of Appeal, 2012) described facially neutral rounding that does not undercompensate employees over time. If your sample week consistently loses minutes, expand the audit: more weeks, more locations, more shifts.

This calculator does not prove a violation. It sizes the gap from the pattern you enter.

California and Oregon caution

• Donohue v. AMN Services (California Supreme Court, 2021) bars rounding California meal periods. This tool does not model meal-period compliance.
• Camp v. Home Depot (Court of Appeal, 2022; California Supreme Court review granted, S277518) held that when exact time is captured, the employer must pay exact time. While review is pending, the Court of Appeal opinion has persuasive value under California Rule of Court 8.1115(e)(1) — it is not final Supreme Court law.
• Woodworth v. Loma Linda University Medical Center (2023) followed the same direction; further action was deferred pending Camp.
• Eisele v. Home Depot (D. Or. 2022) rejected a rounding policy under Oregon wage law at the federal district-court level — a warning for Oregon employers, not an Oregon Supreme Court holding.

For California and Oregon nonexempt workers with exact-time systems, paying exact minutes is usually the simpler, lower-risk configuration.

What is not modeled

• Legality of your policy. The tool measures a minute and dollar gap; it does not issue a compliance opinion.
• Meal-period rounding. California meal rules are separate; see Donohue and the California meal break premium pay calculator.
• Per-punch rounding of in and out independently. This tool rounds the daily gross span (then subtracts break), matching the time card calculator. Some systems round each punch edge separately; results can differ by a few minutes on the same raw times.
• Overtime premiums on the gap. The dollar math uses straight hourly rate × minutes. It does not re-run weekly or daily overtime on the difference.
• Liquidated damages, waiting-time penalties, PAGA, attorney fees, or class aggregation. Those sit on top of unpaid wages when a claim proceeds.
• De minimis doctrine. 29 CFR §785.47 is a separate concept from rounding and is not applied here.

For full legal background, use the time clock rounding rules research and article. For ordinary timesheet totals without exposure scale-up, use the time card calculator.

When this gets re-reviewed

Recheck this methodology when:

• 29 CFR §785.48 is amended;
• the California Supreme Court decides Camp v. Home Depot (S277518);
• Oregon appellate courts speak more clearly on rounding;
• payroll practice shifts away from span rounding toward true per-edge punch rounding in a way that should change the default model.

Data sources

• 29 CFR §785.48 — Use of time clocks — federal rounding intervals and neutrality condition.
• 29 CFR §785.47 — De minimis — out of scope; listed so readers do not confuse it with rounding.
• See's Candy Shops, Inc. v. Superior Court, 210 Cal. App. 4th 889 (2012) — neutral rounding framework in California (pre-Camp).
• Donohue v. AMN Services, LLC, 11 Cal. 5th 58 (2021) — meal-period rounding barred.
• Camp v. Home Depot U.S.A., Inc., 84 Cal. App. 5th 638 (2022) — exact-time pay when exact time is captured (review pending).
• Woodworth v. Loma Linda University Medical Center, 93 Cal. App. 5th 1038 (2023) — same direction as Camp.
• Eisele v. Home Depot U.S.A., Inc., 643 F. Supp. 3d 1166 (D. Or. 2022) — Oregon district-court warning on rounding.
• California Rule of Court 8.1115 — effect of Court of Appeal opinions under Supreme Court review.