LESS mixins for generating pixel and rem values for padding using one to four values.

padding-with-four-values.less

.padding-four-values (@padding1: 16; @padding2: 16; @padding3: 16; @padding4: 16;) {
    @padding1Value: (@padding1 / 10);
    @padding2Value: (@padding2 / 10);
    @padding3Value: (@padding3 / 10);
    @padding4Value: (@padding4 / 10);
    padding: (@padding1 * 1px) (@padding2 * 1px) (@padding3 * 1px) (@padding4 * 1px);
    padding: ~"@{padding1Value}rem" ~"@{padding2Value}rem" ~"@{padding3Value}rem" ~"@{padding4Value}rem";
}

usage:
.padding (15, 10, 12, 18);

output:
padding: 15px 10px 12px 18px;
pading: 1.5rem 1rem 1.2rem 1.8rem;

padding-with-one-value.less

.padding (@padding1: 16) {
    @padding1Value: (@padding1 / 10);
    padding: (@padding1 / 1px);
    padding: ~"@{padding1Value}rem";
}

usage:
.padding (10);

output:
padding: 10px;
pading: 1rem;

padding-with-three-values.less

.padding-three-values (@padding1: 16; @padding2: 16; @padding3: 16;) {
    @padding1Value: (@padding1 / 10);
    @padding2Value: (@padding2 / 10);
    @padding3Value: (@padding3 / 10);
    padding: (@padding1 * 1px) (@padding2 * 1px) (@padding3 * 1px);
    padding: ~"@{padding1Value}rem" ~"@{padding2Value}rem" ~"@{padding3Value}rem";
}

usage:
.padding (15, 10, 12);

output:
padding: 15px 10px12px;
pading: 1.5rem 1rem 1.2rem;

padding-with-two-values.less

.padding-two-values (@padding1: 16; @padding2: 16;) {
    @padding1Value: (@padding1 / 10);
    @padding2Value: (@padding2 / 10);
    padding: (@padding1 * 1px) (@padding2 / 1px);
    padding: ~"@{padding1Value}rem" ~"@{padding2Value}rem";
}

usage:
.padding (15, 10);

output:
padding: 15px 10px;
pading: 1.5rem 1rem;