Sales commission calculator: compute commission from sale amount, rate, and salary plus commission for any pay period. Editable rates, free, runs locally.
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Quarter at $250k sales
What this means for your numbers: Commission is 19% of the worked example's $47,500 quarter. The marginal plan pays $3,000 more on the same sales: structure matters as much as rate.
Illustrative breakdown using the worked example above. The calculator computes your own numbers with the same formula.
A Worked Example: $18,000 at 4.5% Plus $2,000 Base
Say a rep closes an $18,000 deal at a 4.5% commission rate with a $2,000 monthly base salary. The commission line is sale times rate divided by 100: 18,000 x 4.5 = 81,000, and 81,000 / 100 = $900.00 in commission.
Add the base: $900.00 + $2,000 = $2,900.00 total pay for the period. That ratio matters for planning: commission is about 31% of this paycheck (900 / 2,900 = 0.3103), so the rep is mostly salary-covered. If the same rep closed two more $18,000 deals, commission would triple to $2,700 while the base stays flat, moving commission to 57% of a $4,700 paycheck.
The formula scales linearly in both directions. Doubling the sale to $36,000 doubles commission to $1,800 exactly; it does not compound. Only tiered plans break that linearity, which is why the note above tells you to check your plan before treating the flat result as final.
Where Flat Commission Math Breaks in Real Plans
Most real comp plans are not the single-rate formula above, and the gaps have dollar-sized consequences. Tiered structures are the common case: 5% on the first $50,000 of quarterly sales and 8% above it means a $90,000 quarter pays 2,500 + 3,200 = $5,700, not the $4,500 that a flat 5% suggests. That is a $1,200 difference on one quarter.
Quotas and accelerators cut the other way. A plan paying full rate only after a $30,000 monthly quota pays nothing on a $29,000 month, so the tool's $1,450 result at 5% overstates real pay by the entire amount. Some plans also apply draw recovery: a $3,000 draw is subtracted from later commissions, turning a $2,800 commission month into a $0 check.
Two smaller traps: gross vs net. A 10% rate on $10,000 gross revenue is $1,000, but if the plan pays on net after $1,500 of fees, the same rate yields $850. And draw-split deals where a partner takes half halve the figure: a $6,000 commission split 50/50 is $3,000. Ask payroll which number the rate applies to; the calculator assumes the gross sale figure you type.
