Core answer: Markup = (price − cost) ÷ cost × 100%. Cost ¥50, price ¥80 → markup 60%. Pricing from cost: price = cost × (1 + markup). Retail staples run 20–50% markup, restaurants 200–300% on food (70% food margin), jewelry 100–300%. Critical: markup ≠ margin — a 100% markup is a 50% margin; a 50% markup is a 33% margin.

The conversion table (memorize the anchors)

MarkupMarginMarginMarkup
25%20%20%25%
50%33.3%30%42.9%
100%50%40%66.7%
150%60%50%100%
300%75%60%150%

Formulas: margin = markup ÷ (1+markup); markup = margin ÷ (1−margin).

Pricing from a target margin (the right way)

You want a 40% margin on a ¥60 item: price = cost ÷ (1 − margin) = 60 ÷ 0.6 = ¥100. The wrong way — 60 × 1.4 = ¥84 — yields a 28.6% margin. This single error silently bankrupts small shops.

Worked examples

Example 1 — Keystone pricing. Traditional retail doubles wholesale: ¥40 cost → ¥80 retail (100% markup = 50% margin). Workable only where volume/discounts stay modest; e-commerce gutted keystone in most categories.

Example 2 — Menu pricing. Target food cost 30%: price = ingredient cost ÷ 0.30. A ¥12 pasta plate ingredient → ¥40 menu price. Same dish at 35% food cost → ¥34.3 — match your segment's band.

Example 3 — Discount headroom. Cost ¥50, price ¥100 (100% markup). A 20% discount (¥80) still holds 60% markup / 37.5% margin; a 50% discount hits cost. Know your floor before the promotion, not during.

Example 4 — Freight-in cost. ¥50 item + ¥6 shipping + ¥2 packaging: real cost ¥58. Marking up the ¥50 by 60% prices at ¥80 — actual margin only 27.5% instead of the planned 37.5%. Landed cost is the only honest base.

Common mistakes and myths

  1. The 40% illusion — believing "cost +40% = 40% margin"; see the table, it's 28.6%.
  2. Marking up product cost only — shipping, packaging, payment fees (0.6–1%), and platform commissions (5–25%) all belong in cost before markup.
  3. Uniform markup across SKUs — traffic items tolerate thin markup; exclusive/convenience items carry the profit. Blended strategy beats flat rules.
  4. Ignoring markdowns in planned markup — fashion plans "initial markup" expecting 20–30% of units to clear at discount; the season's AVERAGE margin is what matters.
  5. Cost-plus complacency — markup sets the floor; if customers would pay ¥120 for the ¥100 item, cost-plus leaves ¥20 on every sale.