Converters
Free tools in this category, built for quick workflows.
Unit Converter
Convert length, weight, temperature, and area units.
Percentage Calculator
Calculate percentages, increase, and decrease easily.
Tip Calculator
Split bills and calculate tip by percentage.
Loan Payment Calculator
Estimate monthly payment, total interest, and total repayment.
Sales Tax Calculator
Calculate tax amount, pre-tax price, and final total in seconds.
Discount + Tax Calculator
Apply discount first, then calculate sales tax and final checkout total.
APR Calculator
Estimate annual percentage rate or monthly payment for a fixed-term loan.
Subscription Waste Finder
Upload CSV and detect recurring charges, duplicates, and possible wasted spend.
Subscription Downgrade Optimizer
Model ad tiers, annual plans, and bundles to cut recurring subscription costs.
Quarterly Tax Safe-Pay Planner
Estimate quarterly tax payments and due-date targets for freelancers and side income.
EV Charging Cost Calculator
Estimate EV charging costs by U.S. state with home/public mix and gas comparison.
EV Trip Charging Cost Planner
Estimate charging stops, charging time, and trip cost for long-distance EV travel.
Markup & Margin Calculator
Calculate selling price, markup, margin, and profit from cost data.
Currency Converter
Convert between USD, EUR, GBP, CAD, AUD, JPY, and CNY.