Everyday Life

Small tools for everyday numeric decisions, from tips to electricity cost.

Calculate tip, total bill and per-person amount from bill value, tip percentage and party size.

Split a bill across people after optional extra charges or discounts.

Compare packages by cost per common unit.

Estimate electricity cost from kWh consumption and a user-entered tariff.

Calculate appliance energy use and cost from wattage, daily usage, days and electricity price.

Estimate battery runtime from capacity, voltage, load power and efficiency.

About this collection

Small tools for everyday numeric decisions, from tips to electricity cost. 6 free tools.