Handy calculators for tips, percentages, and other daily calculations.
Everyday calculators handle the quick math that comes up in daily life — splitting a restaurant bill, calculating a discount percentage, working out what percent one number is of another, or checking whether a 20% tip rounds nicely. These tools save time and prevent arithmetic errors for calculations most people encounter several times a week.
Calculate tip, total, and per-person split with rounding and pre-tax options.
Open calculator →Find percent of a number, percent change, and percentage difference.
Open calculator →Find sale price, savings, and discount percentage.
Open calculator →Add or remove sales tax from any price.
Open calculator →Restaurant tip and splitting the bill among multiple people: Tip Calculator. Calculating a percentage, percent change, or what percent one number is of another: Percentage Calculator. Checking a sale price: Discount Calculator. Adding or removing checkout tax: Sales Tax Calculator.
Tipping customs vary by service type in the United States. Sit-down restaurants: 15% for adequate service, 18–20% for good service, 20–25% for excellent service. Food delivery: 10–15% of the order total (minimum $3–5). Counter service and coffee shops: $1–2 per visit or 10–15% if you choose to tip. Hotel housekeeping: $2–5 per night, left daily since staff may rotate. Taxi and rideshare: 15–20%. Hair and personal care services: 15–20%. Moving services: $20–50 per mover for a full-day job is a typical guideline. These are general guidelines — actual tipping decisions are always personal and should reflect the quality and context of the service.
Percentages appear constantly in daily situations. Sale prices: '30% off' means you pay 70% of the original price. Tax: multiply the pre-tax price by (1 + tax rate) to get the total, or divide the tax-included price by (1 + tax rate) to back out the pre-tax amount. Grades: divide points earned by total possible points and multiply by 100. Nutritional labels: '15% Daily Value' means that serving provides 15% of the recommended daily intake. Investment returns: percent change = (new value − original value) ÷ original value × 100. The Percentage Calculator handles percent of a number, percent change, and percent difference in one tool.
Knowing a few mental shortcuts makes percentage estimation fast. To find 10%: move the decimal point one place left ($73 → $7.30). To find 20%: find 10% and double it ($73 → $14.60). To find 5%: find 10% and halve it ($73 → $3.65). To find 15%: add the 10% and 5% results together ($7.30 + $3.65 = $10.95). For a 25% discount: the sale price is 75% of original — multiply by 0.75. For a 20% discount: multiply by 0.80. For a 15% tip on a $47 bill: 10% = $4.70, 5% = $2.35, total tip = $7.05, total bill = $54.05.