Discount Calculator

Calculate percentages in 4 modes: X% of Y, X is what % of Y, percentage change, and percentage difference.

Calculate tip amount and split the bill among multiple people. Supports custom tip percentages and any number of guests.

Calculate the fee PayPal, Stripe, Square, or a custom processor deducts from a payment, and your net payout. Reverse mode solves what to charge to net a target amount.

Calculate an item's cost per wear from its price and how many times you've worn it, with an instant value rating. Compare up to 3 items side-by-side. Free, client-side.

Calculate EV charging cost from battery size, electricity rate, and charging loss, plus range added, charging time, and a cost-per-mile comparison against gas. Free, instant.

Compare up to 4 pizzas by true price per square inch and cost per slice to see which size is actually the better deal. Free, instant, no sign-up.