How to Compare Two Discounts
When is £20 off better than 20% off? Depends on the price.
Convert both to final-price-in-pounds, then compare. Do not compare percentage to dollar-off directly.
The question "is 20% off better than £30 off?" has no universal answer — it depends entirely on the price of the item. Always convert both options to the same unit (final price) before comparing.
Part of: Saving & Spending Calculators
Quick answer
Convert both to final-price-in-pounds, then compare. Do not compare percentage to dollar-off directly.
Key points
- ▸ Convert both discounts to final price, then compare. Never compare % to £ directly.
- ▸ Cross-over point: for an X% discount vs. a £Y flat discount, they are equal when price = Y / (X/100).
- ▸ Rule of thumb: percentage discounts win on expensive items; flat discounts win on cheap items.
- ▸ £20 off vs. 20% off — equal at £100. Above £100, the percentage wins; below, the flat does.
- ▸ Watch for minimum-spend thresholds on flat-dollar discounts — they may not apply to your cart.
Examples
- £20 off vs. 20% off, item £60Flat: £60 − £20 = £40. Percentage: £60 × 0.80 = £48. Flat wins by £8.
- £20 off vs. 20% off, item £200Flat: £200 − £20 = £180. Percentage: £200 × 0.80 = £160. Percentage wins by £20.
- Cross-overAt £100, both land on £80. Below £100 the flat wins; above, the percentage.
When to use which tool
- Discount CalculatorMain tool — enter both discount options and compare final prices directly.Calculate the sale price and savings from any percent-off discount.
- Percentage CalculatorFor running the cross-over math when comparing multiple offers.Calculate percentages: what is X% of Y, X is what % of Y, and % change.
Related
- Discount CalculatorCalculate the sale price and savings from any percent-off discount.
- Percentage CalculatorCalculate percentages: what is X% of Y, X is what % of Y, and % change.
- How Discounts StackThe compounding math, and why stacked discounts look bigger than they are.
- Percentage Mental Math TricksFive shortcuts that cover tips, discounts, tax, and sale prices.
Frequently asked questions
› What about percentage off a sale price?
That is a stacked discount — compound them. If the item is already 25% off and you have a 10% coupon, total discount = 1 − 0.75 × 0.90 = 32.5%, not 35%.
› Are loyalty discounts applied before or after coupons?
Varies by store. Check the sequence at checkout — sometimes you get a bigger discount by applying the percentage first and the flat after, or vice versa.
› How should I use this guide with a Kefiw tool? How-to
Use the guide as the plan and the linked Kefiw tool as the check. Read the steps first, try the move manually, then use the tool to compare outputs, catch edge cases, and decide whether the result actually fits your task.
› What mistake do tool guides help avoid? Troubleshooting
Tool guides help avoid using a utility mechanically without understanding what you are trying to accomplish. Most word, writing, and text utilities are fast, but speed can hide context mistakes. Know whether you are solving a puzzle, cleaning copy, drafting a line, or checking a rule.
› Can a tool guide help me learn the skill? How-to
A tool guide can help you learn if you pause before accepting the output and ask why it worked. Compare your first guess with the tool result, look for the rule or pattern, and repeat that review. Passive copying solves one task; active review builds the skill.