Shopping &amp; Discounts calculators

Calculate a sale price, reverse a discount, or stack multiple offers and tax in the order checkout applies them.

What is the final sale price?
What is the effective stacked discount?

Price, discount mode, optional tax

Final price, discount, checkout savings

Price per Unit

Normalize mixed package sizes and rank up to six products by unit price, including the gap to the next-best option.

Which package is the best value?
How much cheaper is it per unit?

Product prices, quantities, and units

Ranked unit-price comparison

Subscription Tracker

Normalize weekly, monthly, quarterly, and yearly bills, separate active from paused items, and surface the largest review opportunity.

What do my subscriptions cost per month and year?
Which active subscription costs the most?

Subscription, amount, billing cycle, category, status

Monthly and annual spend by category

02 — Live shopping & discounts calculators

Ready to use

Open a live tool for calculator inputs, results, formula context, and published examples.

Sales Tax

Add tax, remove tax from a total, or infer an effective rate with state-average and custom-rate modes.

What will checkout cost after tax?
What tax rate was applied?

Amount, calculation mode, state or custom rate

Subtotal, tax, total, implied rate