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.
Paycheck Calculator
Estimate gross pay, taxes, and take-home pay for each paycheck.
Pay Raise Calculator
Estimate how a raise changes annual, monthly, and take-home pay.
Time Card Calculator
Track weekly work hours, overtime, and gross pay from clock-in entries.
Overtime Pay Calculator
Calculate regular, overtime, and double-time pay with weekly or California-style daily overtime rules.
1099 vs W-2 Take-Home Calculator
Compare estimated annual value between W-2 and 1099 scenarios with taxes, expenses, and benefits.
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.
W-4 Withholding Checkup Calculator
Estimate whether your federal withholding is on track and how much extra withholding may be needed per paycheck.
HSA Contribution & Tax Savings Calculator
Estimate HSA contribution room, catch-up eligibility, and tax savings from payroll or direct contributions.
Mileage Deduction Calculator
Estimate business, medical, and charity mileage value with editable standard-mileage rates and parking/toll adjustments.
Home Electricity Bill Estimator
Estimate a monthly home power bill from state-average electricity rates, kWh usage, fixed fees, and off-peak assumptions.
EV Charging Cost Calculator
Estimate EV charging cost by U.S. state, compare home vs public charging, and benchmark annual EV savings against gas.
EV Trip Charging Cost Planner
Estimate charging stops, charging time, and trip cost for long-distance EV travel.
EV Charge Time Estimator
Estimate charging time and charging cost from start SoC to target SoC.
EV Home Charger Payback Calculator
Estimate Level 2 charger payback period using home/public charging mix and local rates.
EV Battery Degradation Estimator
Forecast EV battery health and expected range decline by usage and climate profile.
Markup & Margin Calculator
Calculate selling price, markup, margin, and profit from cost data.
IB Buying Power Simulator
Estimate remaining stock buying power from A/B/C positions under simplified margin assumptions.
ETF Move Recalculator
Estimate ETF fair move from weighted constituent returns, with sentiment adjustment and backsolve for unmodeled weight.
Options Breakeven & P/L Calculator
Calculate call/put breakeven and expiration profit or loss for single-leg option positions.
Covered Call Return Calculator
Estimate premium income, called-away return, breakeven, and annualized yield for covered calls.
Cash-Secured Put Yield Calculator
Calculate cash-secured put premium yield, breakeven, assignment basis, and annualized return.
Currency Converter
Convert between USD, EUR, GBP, CAD, AUD, JPY, and CNY.
Periodic Table
Browse all chemical elements with search, family filters, and quick element details.