Price Increase Calculator
See how much to raise prices when unit costs or tariffs go up, to keep your profit per unit or your margin %.
Your numbers
Your result · updates as you type
New price to keep your profit per unit
$41.86
+4.7% on $40.00. Your cost per unit rises $1.80 (10%), from $18.00 to $19.80.
- Price to keep profit per unit
- $41.86 (+4.7%)
- Price to keep margin %
- $44.00 (+10%)
- If you absorb the increase
- −$900 a month
This keeps $20.80 profit per unit, but your margin slips from 52% to 49.7%. Any drop in unit sales now cuts total profit, so watch conversion for a few weeks after the change.
Breakdown
- If your cost rises by
- Keep profit · Keep margin %
- Cost +5% (to $18.90)
- $40.93 · $42.00
- Cost +10% (to $19.80) · yours
- $41.86 · $44.00
- Cost +15% (to $20.70)
- $42.79 · $46.00
- Cost +20% (to $21.60)
- $43.72 · $48.00
- Cost +25% (to $22.50)
- $44.64 · $50.00
- Cost +30% (to $23.40)
- $45.57 · $52.00
How the new price is worked out
Start with what you keep from each sale today: the price, minus fees charged as a % of the sale, minus everything else you pay per unit. Then pick the number you want to protect.
Example
- Current price
- $40.00
- Cost per unit
- $18.00, rising 10% to $19.80
- Fees
- 3% of the sale ($1.20 today)
- Profit per unit today
- $40.00 − $1.20 − $18.00 = $20.80 (52%)
- Units sold per month
- 500
Keep profit: (20.80 + 19.80) ÷ 0.97 = $41.86 (+4.7%). Keep margin: 19.80 × 40 ÷ 18 = $44.00 (+10%). Absorbing the increase instead costs 500 × $1.80 = $900 a month.
The table under the result repeats the math for cost increases from 5% to 30%, so you can plan ahead for the next supplier quote.
Profit per unit or margin %: which to protect
- Keep profit per unit for the smallest increase that stops you losing money on each sale. It suits price-sensitive products. Your margin % still slips (52% to 49.7% in the example), so any drop in sales cuts total profit.
- Keep margin % when your other costs grow with revenue, such as ad budgets set as a return on ad spend. It's a bigger increase, but profit per unit rises, which gives you room to lose some sales. The calculator shows how many.
- Tariffs are charged on the customs value, not your landed cost. In the US, that's generally the price paid to the supplier, excluding international freight and insurance. A 10% tariff on a $12 customs value adds $1.20 a unit, not 10% of your whole cost.
- Fees rise with the price. Payment processing and marketplace commission are a % of the sale, so the calculator grosses the new price up to cover them.
- Rounding only goes up. Choose .99, .95 or a whole number and the calculator rounds up, never down, so you never land below the target you picked.
Changing prices in Shopify and WooCommerce
- 01
Shopify
Go to Products, select the products and click Bulk edit. Change the Price column (and Compare-at price if you use it), then save. Update Cost per item too, so your margin reports use the new cost.
- 02
WooCommerce: simple products
Go to Products → All Products, tick the products, choose Edit from Bulk actions and click Apply. Under Price, pick Increase existing price by (fixed amount or %).
- 03
WooCommerce: variable products
Open the product and go to the Variations tab. Use the bulk action Increase regular prices (fixed amount or percentage), then save.
- 04
Watch the result
Compare conversion rate and units sold for two to four weeks before and after. If you kept your margin %, the calculator's note tells you how big a drop in sales you can absorb.
Questions people ask
How much should I raise prices when my costs go up?
To keep the same profit per unit, raise the price by the cost increase grossed up for fees, which is a smaller % than your cost rose. To keep the same margin %, raise it by the same % as your cost.
Do I raise prices by the tariff percentage?
No. The tariff applies to the customs value of the goods, which is usually well below your selling price. Enter the customs value and the rate, and the calculator turns it into an extra cost per unit.
Will I lose customers if I raise prices?
Possibly some. If you keep your margin %, profit per unit rises, so you can sell fewer units and still earn today's profit. The calculator shows that break-even drop.
Why does the calculator ask about fees?
Fees charged as a % of the sale grow with the price. At 3% fees, a $2.00 price rise only keeps $1.94, so leaving fees out makes the new price fall slightly short.
Should I include shipping in the cost?
Include what you pay per unit to get stock in (inbound freight, duties). Leave out outbound shipping if customers pay for it separately at checkout.
Related tools
Want this builtinto your store?
I'm Emmanuel, a Shopify and WooCommerce developer. If this tool pointed at something you'd rather have fixed for you (a faster store, cleaner product data, a migration, a custom feature), send me a note.
Emmanuel Asika
Shopify & WooCommerce developer, Dublin
I build and fix online stores: new builds, migrations, speed, SEO and the custom bits apps can't do.
Last reviewed 30 September 2026.
Sources: U.S. CBP: What Every Member of the Trade Community Should Know About Customs Value · WooCommerce: Bulk editing products · WooCommerce: Variable products