TIME CALCULATION GUIDE
Person-Hours Are Not Elapsed Time
Three people working at the same time for 30 minutes use 1.5 person-hours. Learn how that differs from elapsed time, which durations to add, and when repeats should stay.
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Shopping & Money
Compare promotions, unit prices, and package-size changes.
- Extra vs. DiscountCompare a bonus-size offer with a percentage discount to see which one gives you a lower unit price.Open calculator
- Buy X, Get Y FreeCalculate the total cost and effective discount for a buy-X-get-Y-free deal, including items left over after complete sets.Open calculator
- Second Item DiscountCompare a discount on the second item with a discount on both items. Enter different prices to see which offer saves more.Open calculator
- ShrinkflationCompare price and package-size changes to find the effective change in unit price.Open calculator
- Percent Off vs. Dollar OffCompare a percentage discount with a dollar-off coupon, including both final prices and the break-even price.Open calculator
- Minimum Spend CouponCheck how much more you need for a spend-threshold coupon, what you would pay, and the real percentage saved.Open calculator
- Unit Price ComparisonCompare package prices per ounce, per item, or per 100 g or ml. See the lower unit price and percentage saved. Enter both amounts in the same unit.Open calculator
Text
Compare and clean up text without uploading it.
- Compare Two ListsCompare two lists regardless of order. Find items only in A, only in B, or in both, and copy each result separately.Open tool
- Text DiffCompare two versions of a text to find added, removed, and changed lines, with character-level highlighting for edits within a line.Open tool
- Remove Duplicate LinesRemove repeated lines from your text while keeping the first occurrence and the original order.Open tool
Time
Add durations and convert the total to minutes or decimal hours.
GUIDES
Understand the differences that matter
TEXT COMPARISON GUIDE
Remove Repeats, Keep the Original Order
Clean up a packing list or shortlist without sorting it. See which copy stays, when repeated lines carry useful information, and how spaces and blank lines affect the result.
TIME CALCULATION GUIDE
Why 1 Hour 30 Minutes Is 1.5 Hours
Add work, study, or video durations correctly. Learn why 1:30 is not 1.30 hours, when to carry minutes and seconds, and why rounding each entry can change the total.
TEXT COMPARISON GUIDE
What Is Missing from Your List?
Find missing and shared items without confusing a different order with a real change. Learn when spaces, repeated entries, and spelling affect the result.
TEXT COMPARISON GUIDE
Three Things to Check in a Text Diff
A small edit can change a message completely. Learn how to review changed lines, spot hidden spaces, and tell a line break from a wording change with examples you can try.
SHOPPING MATH GUIDE
20% Extra vs. 20% Off
See why 20% more product is not the same as 20% off, with a simple unit-price comparison.
SHOPPING MATH GUIDE
Buy 3, Get 1 Free: Meaning and Savings
Pay for 3, take home 4: buy 3, get 1 free is 25% off equal-priced items. See when extra items or different prices change the deal.
SHOPPING MATH GUIDE
BOGO 50% Off: The Real Discount
See why a half-price second item means 25% off when both items cost the same, and why different prices change the savings.
SHOPPING MATH GUIDE
How to Calculate Shrinkflation
Use unit prices to measure the real price increase when a package gets smaller, more expensive, or both.
SHOPPING MATH GUIDE
Percent Off vs. Dollar Off
Learn when a percentage discount or a dollar-off coupon saves more, using a simple break-even calculation.
SHOPPING MATH GUIDE
Spend $50, Get $10 Off
See how a minimum-spend coupon changes from 20% off to a smaller effective discount as your cart gets larger.
SHOPPING MATH GUIDE
Is the Bigger Package a Better Deal?
Compare price per unit to decide between package sizes, and learn when a lower unit price is not the whole answer.
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