Free everyday tools
Four common tools,
without the spreadsheet.
Check a coupon-adjusted total, compare different pack sizes, and estimate electricity use or convert Base64 text. No account or saved inputs required.
All four tools run in your browser. Nothing you type into these calculators is sent to our server.
Display currency applies only to the price and energy-cost tools. It changes labels and the example rate, but does not convert values or fetch exchange rates.Discount and checkout total
See the amount left after a percentage discount and fixed coupon, then add shipping.
The percentage discount is applied first, then the fixed coupon. Shipping is added last.
Stores can apply coupons in a different order or exclude some items. Compare this estimate with the final checkout screen.
Unit-price comparison
Convert two pack sizes to the same basis before deciding which one costs less.
Unit price = final price ÷ quantity × comparison basis.
Include delivery fees and discounts in each final price. Unit price does not compare quality, durability, or how much you actually use.
Electricity-use estimate
Estimate energy use from a device's wattage and your daily usage time.
kWh = watts × devices × hours per day × days ÷ 1,000.
The starting electricity rate is only an example. Replace it with the effective rate from your bill. Tiered pricing, taxes, standby use, and appliance cycling are not included.
Base64 encoder and decoder
Choose Standard Base64 or Base64URL, then encode UTF-8 text or decode it back to the original text.
Base64 is encoding, not encryption. It does not protect passwords or other sensitive information.