Category 07
Shopping & food calculators
Compare prices, portions, subscriptions, tips, and shared spending.
16 practical tools
All 16 calculators are available now with visible formulas and assumptions.
Unit price comparison
Which package is actually cheaper per unit?
Discount stack and final price
What is the final price after discounts, tax, and shipping?
Sales tax or VAT
What are the tax, net price, and gross price?
Tip and bill split
What does each person owe after tip and tax?
Bulk purchase break-even
When does a larger pack still save money after waste?
Price per use
Is a higher upfront price cheaper over its lifetime?
Subscription vs one-time purchase
When does ownership become cheaper than subscribing?
Recipe scaler
How much of each ingredient is needed for more servings?
Catering portions
How much food is needed for all the guests?
Grocery budget per person
What food budget follows from household size?
Coupon savings total
How much do coupons save after minimum spends and tax treatment?
Grocery price change
How much has the same grocery basket changed in price?
Meal cost per serving
What does a home-cooked meal cost for each serving?
Home coffee cost
What does each cup cost after beans, milk, filters, and equipment?
Food waste cost
What does discarded food add up to each month and year?
Percentage change & reverse price
What is the percentage change, and what value came before a known change?