PlainCalc — Free Fee, Pay & Energy Calculators
Clear numbers. Keep more.
No-signup calculators for high-intent money questions: marketplace fees, paycheck math, and energy costs. Instant results on mobile. Assumptions dated and disclaimed.
Etsy fee calculator
Listing, transaction, and payment processing fees — plus shipping, materials, and optional ads. See net profit and margin.
Open calculator →Amazon FBA fee calculator
Rough referral + FBA fee profit check. Category presets with a strong reminder that Amazon’s tool is authoritative.
Open calculator →Overtime pay calculator
Hourly rate, regular / OT / double-time hours. Weekly gross with FLSA-style framing — not legal advice.
Open calculator →Salary to hourly calculator
Convert with 2080, 2040, or custom hours. Optional paycheck estimate using your tax %.
Open calculator →EV charging cost calculator
Home vs public ¢/kWh, battery or session kWh, optional cost per mile from mi/kWh or MPGe.
Open calculator →Electricity cost calculator
Watts or kWh × hours × your rate → daily, monthly, and yearly cost for devices and appliances.
Open calculator →Guides & worked examples
Etsy fees on a $50 sale
Hand-checked US fee breakdown with profit.
Read example →Amazon 15% referral example
Unit economics with sample FBA fee.
Read example →Time-and-a-half overtime
$22/hr × 40 + 8 OT worked example.
Read example →Salary ÷ 2080 hours
Why that full-time yardstick exists.
Read example →EV home vs public
40 kWh at 16¢ vs 45¢ per kWh.
Read example →Space heater cost
1500W × hours → bill impact.
Read example →FAQ
Is PlainCalc free? Do I need an account?
Yes — all calculators are free to use with no signup. Results run in your browser; we don’t require an account.
Are marketplace fees exact?
No. Fee schedules change and often depend on category, country, and order details. We publish dated assumptions (see each tool) and link to official sources. Always verify before pricing inventory.
Is overtime or salary math legal advice?
No. Pay tools are illustrative only. Labor rules vary by jurisdiction and employment status. See our Disclaimer.
How do you make money?
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