What this calculator does
Find out how much commission you'll earn on your sales, or how much you need to sell to hit a goal. A commission is pay tied to what you sell: a percent of the sales you close. Some plans use one flat rate on everything. Others are tiered, so the rate goes up once your sales pass set levels. That rewards the extra effort it takes to sell more.
This calculator handles both. Enter your sales to see the commission. Or switch to the reverse option, enter the payout you're aiming for, and see how much you need to sell. Tiered plans work like income tax brackets: each rate applies only to the sales inside its tier. This is called a "marginal" plan. The breakdown shows exactly what each tier adds.
Where it's used
Why this math matters outside the classroom:
- Sales pay. A salesperson earning 5% on $12,000 of monthly sales makes $600 in commission.
- Real estate agents. Agents work out their share of a sale price when a commission is split between two brokerages.
- Tiered plans. A plan paying 3% on the first $10,000 and 5% above it pays $300 plus $250, or $550, on $15,000 of sales.
- Setting a target. Reps work backward from a $1,000 commission goal at 4% to find they need $25,000 of sales.
Grade level and standards: Grade 7; Common Core State Standards for Mathematics 7.RP.A.3. © Copyright 2010. National Governors Association Center for Best Practices and Council of Chief State School Officers. All rights reserved.
How to use it
- Choose whether you want the commission on your sales, or the sales you need for a target commission.
- Pick a flat rate or tiered rates. For tiers, enter each rate and the sales level where it stops. Leave the tier 2 limit blank if your plan has only two tiers.
- Enter your total sales, or your target commission.
- Read the commission or the sales needed, the effective rate, and the table showing each tier.
What the inputs mean
- Commission structure
- Flat means one rate on every dollar of sales. Tiered means each rate applies only to the slice of sales inside its tier.
- Target commission
- The commission you want to earn, before taxes. The calculator finds the smallest sales figure that pays it.
- Tier 1 applies to sales up to
- The sales level where tier 1 ends and tier 2 begins. Tier 1 always starts at $0.
- Tier 2 applies to sales up to
- Where tier 2 ends. Sales above this level earn the tier 3 rate. Leave it blank for a plan with two tiers.
- Tier 3 rate (sales above the tier 2 limit)
- The rate on every dollar of sales above the tier 2 limit. It has no upper limit.
Formula and method
Flat: commission = sales × rate ÷ 100 Tiered: commission = Σ (sales inside tier × tier rate ÷ 100) sales inside a tier = min(sales, tier top) − tier bottom, if positive effective rate = commission ÷ sales × 100 Reverse (flat): sales = target ÷ (rate ÷ 100)
In the formulas, Σ means "add up all of these". "min(a, b)" means "whichever is smaller". A tier's bottom and top are the sales levels where it starts and stops.
With a flat plan, the commission is a plain percent of sales. With a tiered plan, your sales are cut into slices at each tier's limit, and each slice is paid at its own rate. Crossing into a higher tier never lowers your pay on earlier sales, because only the new dollars get the new rate.
The reverse option climbs up the tiers one at a time. It adds the full commission of each tier until the next tier would push the total past your target. Then it works out how far into that tier you need to go. That's the commission still needed, divided by that tier's rate.
The effective rate is your total commission as a share of your total sales. On a tiered plan, it sits between the lowest and highest rates, and it climbs as sales grow.
Worked example
A plan pays 3% on the first $50,000 of sales, 5% from $50,000 to $100,000, and 8% above $100,000. This quarter you sold $120,000.
- Tier 1: $50,000 × 3% = $1,500.00.
- Tier 2: $50,000 × 5% = $2,500.00.
- Tier 3: the $20,000 above $100,000 × 8% = $1,600.00.
- Total: $1,500 + $2,500 + $1,600 = $5,600.00. That's an effective rate of $5,600 ÷ $120,000 = 4.67%.
Result: The commission is $5,600.00. Working backward, a $5,600 target needs exactly $120,000 in sales.
Understanding the result
Compare the effective rate with the top rate to see how much of your pay comes from the higher tiers. A big gap means most of your sales still fall in the lower tiers.
In the reverse option, the result is the sales level where you reach your target. Any sale past it earns the rate of the tier you've reached.
Assumptions and limitations
- Tiers are marginal: each rate applies only to the sales inside its tier. Some plans instead pay the higher rate on all sales once you cross a level. That's often called a retroactive or all-sales tier, and this calculator doesn't handle it.
- Commission is a percent of sales revenue. Plans that pay on gross profit, per item, or with a draw against commission (an advance paid back from later commission) need adjusting.
- It doesn't include base salary, bonuses, chargebacks (commission taken back, for example on returns) or taxes.
- It handles up to three tiers. For a plan with more, you can get close by running it in pieces.
- Results are pay before anything is withheld. Commission is usually taxed as ordinary income, so your take-home amount will be lower.
- Your pay agreement has the final word on how commission is worked out, timed and paid.
Frequently asked questions
What is the difference between marginal and all-sales tiers?
With marginal tiers, reaching a higher tier raises the rate only on sales above that level. With all-sales tiers, the higher rate applies to every dollar once you cross it. So pay can jump sharply at that point. This calculator uses marginal tiers. For an all-sales plan, use the flat option with the rate you reached.
How do I find my effective commission rate?
Divide your total commission by your total sales and multiply by 100. On a flat plan, it equals the rate. On a tiered plan, it's a blend of the tier rates. Tiers that hold more of your sales count for more in the blend.
How much do I need to sell to earn a certain commission?
On a flat plan, divide the target by the rate as a decimal: $4,000 at 5% needs $4,000 ÷ 0.05 = $80,000. On a tiered plan, use the reverse option. It allows for the different rate in each tier.
Is commission calculated on sales or on profit?
It depends on the plan. Many retail and real-estate plans pay on the sale price. Some business-to-business plans pay on gross margin (the sale price minus what the goods cost), so discounts don't eat into profit. If yours pays on profit, enter the profit as the sales amount.
How this calculator is checked
Method: Percentage of sales for flat commission; marginal bracket summation for tiers; algebraic inversion within the reached tier for the reverse mode. The calculation is covered by automated tests with known reference values and edge cases. Last updated 2026-10-18. Found a problem? Tell us.
Embed this calculator
Put this Commission Calculator on your own website or blog for free. Paste this code where you want it to appear: