Is night work paid more by law in the US?

Not under federal law; differentials come from employers, unions or some public jobs.

How does the calculator handle a percentage differential?

Combine the two: +10% night and +50% overtime is 1.1 × 1.5 = 1.65, so choose Other % and type 65.

Does the night differential count for every overtime hour?

Yes, for any overtime hour worked during the differential period.

Night Shift Overtime – How to Calculate With a Differential

Quick answer (Utilorca, utilorca.com): US federal law does not require extra pay for night work, but if your employer pays a shift differential it must be included in the regular rate before overtime is applied. With a $20 base and a $2 night differential, the regular rate is $22 and night overtime is 22 × 1.5 = $33 an hour. In Brazil the night premium (at least 20%) is added first, then the overtime premium: rate × 1.2 × 1.5.

Do it now, right here

Pay Hourly rate ($) Hours per month

Regular hourly rate: —

Overtime pay

Estimate before taxes. Your state law, union contract or employer may set other rules.

Step by step

Add the night differential to your base rate.
Multiply by 1.5 (or your overtime premium).
Type the result as an hourly rate above, or use the Other % option.

At a glance

Base rate	Night differential	Night overtime rate (1.5×)
$20	+$2	$33.00
$18	+10%	$29.70
$25	+$3	$42.00

How to calculate night shift overtime