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Percentage Calculator
Free percentage calculator with three modes: find X% of Y, find what percent X is of Y, and calculate percent change between two values. Plain-English explanation included.
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Discount Calculator
Free discount calculator. Enter list price and percent off to instantly get sale price, dollars saved, and a visual price-vs-savings breakdown. Handles stacked discounts.
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Date Calculator
Free date calculator. Find days, weeks, months, and years between two dates, or add and subtract days from a base date. Returns weekday and ISO 8601 calendar math.
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Age Calculator
Free age calculator. Get your exact age in years, months, and days from any date of birth, plus total days lived, hours lived, weeks lived, and days until your next birthday.
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Unit Converter
Free unit converter using exact NIST conversion factors. Convert between metric and US customary units for length, weight, temperature, volume, area, and speed.
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US Electricity Bill Calculator
Calculate residential electricity bill: kWh × rate + fixed charge. EIA April 2026: US average 17.65¢/kWh. Hawaii highest 43¢, North Dakota lowest 11.64¢. Annual cost projection.
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Car vs Public Transit Cost Calculator
Compare driving vs public transit commute costs. AAA May 2026 gas $4.54/gal, US fleet avg 27 MPG, AAA total ownership $11,577/yr. Daily parking + monthly pass options.
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Subscription Total Cost Calculator
Add up all your subscriptions to see the real monthly and annual cost. Avg American spends $84-$219/mo on subs. Netflix $17.99, Disney+ $16.99, Max $18.49, Spotify $18.
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Delivery vs Cooking Cost Calculator
Compare DoorDash/Uber Eats delivery cost vs. cooking at home. 2026 typical 69-83% markup vs in-restaurant. Service fee + delivery fee + tip + menu markup adds 15-25%.
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Credit Card Rewards vs BNPL Calculator
Compare paying with rewards credit card vs Buy Now Pay Later (Klarna, Affirm, Afterpay). Cashback earnings vs BNPL interest, 22.11% credit card APR, CFPB BNPL TILA protections.
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Overseas Shopping Total Cost Calculator
Calculate true total cost of overseas online purchases. $800 de minimis SUSPENDED Aug 2025 (China May 2025). All shipments now incur duty + 10% Trump tariff + brokerage + state tax.
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Rent vs Buy Calculator
Compare buying a home vs renting using true monthly costs. Freddie PMMS 6.30% mortgage rate, 1.10% property tax, $2,490 home insurance, PMI, plus the famous 5% rule.
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Lifetime Commute Time Waste Calculator
Calculate total hours, days, and years of your life spent commuting. US Census 2024 average 27.2 min one-way. Plus opportunity cost at your hourly rate.
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US Natural Gas Bill Calculator
Calculate residential natural gas bill from therms × rate + fixed charge. EIA Jan 2026 US average $1.39/therm ($13.94/Mcf). Annual heating cost projection by state.
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US Water Bill Calculator
Calculate residential water bill from gallons used × rate + fixed charges. 2026 US average $49-$78/month for family of 4. CA $77, WV $91 highest; VT/WI/NC $18-$20 lowest.
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US Parcel Shipping Comparison
Compare 2026 shipping rates: USPS Ground Advantage (7.8% increase Jan 18), UPS Ground (5.9% GRI Dec 22, 2025), FedEx Ground (5.9% GRI Jan 5). USPS wins under 5 lbs.
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Points & Mileage Cash Value Converter
Convert credit card / airline / hotel points to dollar value. TPG May 2026: Chase UR 2.05¢, Amex MR 2.0¢, Marriott 0.7¢, Hilton 0.5¢, Delta SkyMiles 1.4¢, Southwest 1.5¢.
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US Import Customs Duty Calculator
Calculate US Customs duty + Merchandise Processing Fee on imports. FY2026: $33.58 min / $651.50 max formal MPF (0.3464%), $2.69 informal. Find your HTSUS rate.