Free Online Tools
Fast, free, and privacy-friendly tools that work right in your browser. No signup, no data collection.
CalcHub is a collection of free online calculators for tech professionals, freelancers, e-commerce sellers, and everyday life. From LLM API cost estimation and EV charging calculations to TikTok Shop fee breakdowns and compound interest projections — every calculator runs entirely in your browser with zero data uploads. Your numbers stay private, always.
Whether you need to estimate 3D printing costs, calculate salary after inflation, figure out freelance taxes, or compare marketplace fees, our calculators are designed to be fast, accurate, and completely free with no signup required.
Tech Calculators
AI, crypto, and technology calculators
LLM API Cost Calculator
Enter your token usage, get per-request and monthly costs for GPT-4o, Claude, Gemini & Llama side by side. Free browser-based tool, no signup required.
EV Charging Cost Calculator
Enter battery size and electricity rate, get exact charging cost plus EV vs gas savings comparison. Works for Tesla, Rivian & all EVs. 100% free online tool.
3D Printing Cost Calculator
Enter filament weight and print time, get full cost breakdown for material and electricity. Supports PLA, ABS, PETG & more. Free, no account needed.
SaaS MRR Calculator
Enter your subscription plans and customer counts, get MRR, ARR, net MRR growth, LTV, and CAC payback period. Built for SaaS founders. Free online tool.
E-Commerce
Marketplace fees and profit calculators
TikTok Shop Fee Calculator
Enter your price, see exact referral, platform & processing fees deducted. Instantly shows net profit and effective fee rate. Free tool for TikTok sellers.
Marketplace Fee Calculator
Enter your item price, compare net profit across eBay, Etsy, Amazon, Poshmark & Mercari side by side. Find the most profitable platform. Free online tool.
Poshmark Fee Calculator
Enter your sale price, instantly see Poshmark commission, net earnings, and compare with other marketplace fees. Free online tool for Poshmark sellers.
Venmo Fee Calculator
Calculate Venmo fees for business payments, credit card transactions, and instant transfers. Compare Venmo vs PayPal vs Zelle fees side by side. Free online tool.
Whatnot Fee Calculator
Calculate Whatnot selling fees including 8% seller fee and payment processing charges. See your actual earnings after all fees. Free online calculator.
Grailed Fee Calculator
Calculate Grailed selling fees including 9% commission and PayPal processing fees. See your net earnings after all fees. Free online calculator.
Reverb Fee Calculator
Calculate Reverb selling fees including 5% commission and payment processing (2.7% + $0.25). See your net earnings on musical gear sales. Free calculator.
Cash App Fee Calculator
Calculate Cash App fees for instant deposits, business payments, and Bitcoin transactions. Compare Cash App vs Venmo vs Zelle fees. Free online calculator.
Etsy Fee Calculator
Calculate all Etsy selling fees: listing fee, transaction fee (6.5%), payment processing (3% + $0.25), and offsite ads. See your true profit. Free calculator.
Square Fee Calculator
Calculate Square payment processing fees for in-person (2.6% + $0.10), online (2.9% + $0.30), and manually keyed (3.5% + $0.15) transactions. Free calculator.
Amazon FBA Fee Calculator
Calculate Amazon FBA fees including referral fees, fulfillment fees, and storage costs. See your true profit margin. Enter product details for instant results.
GunBroker Fee Calculator
Calculate GunBroker final value fees with tiered rates. See your net earnings after all seller fees. Includes fee comparison with other platforms. Free calculator.
eBay Final Value Fee Calculator
Calculate eBay final value fees by category, with and without eBay Store subscription. See total fees including payment processing. Free online calculator.
Finance
Salary, tax, and money calculators
Salary Inflation Calculator
Enter a salary and two years, see its inflation-adjusted value using official US CPI data. Ideal for raise negotiations. Free browser-based calculator.
Pay Raise Calculator
Enter your salary and raise %, get the after-tax take-home increase per paycheck. Includes federal tax, Social Security & Medicare. Free, no signup needed.
Freelance Tax Calculator
Enter your 1099 income and deductions, get federal + self-employment tax and quarterly payment amounts. Built for freelancers and contractors. 100% free.
Compound Interest Calculator
Enter principal, monthly contributions & rate, get a year-by-year growth table with total interest earned. Plan retirement or savings goals. Free online tool.
Stripe Fee Calculator
Enter your transaction amount, see exact Stripe fees for domestic, international, and currency conversion. Compare with PayPal fees side by side. Free tool.
Freelance Rate Calculator
Enter your desired salary, expenses, and time off, get your ideal hourly, daily, and monthly freelance rate. Includes tax and expense breakdowns. Free tool.
Cost Per Hire Calculator
Enter internal and external recruiting costs, get your total cost per hire, cost breakdown, and benchmarks. Essential for HR teams and recruiters. Free tool.
Credit Card Fee Calculator
Calculate credit card processing fees by card type (Visa, Mastercard, Amex, Discover). See interchange, assessment, and processor markup fees. Free tool.
Credit Card Processing Fee Calculator
Compare credit card processing pricing models: flat rate, interchange-plus, and tiered. Enter your monthly volume and average ticket to see total costs. Free tool.
Coinbase Fee Calculator
Calculate Coinbase trading fees based on your transaction amount and payment method. Compare Coinbase vs Coinbase Advanced fees. Free online calculator.
Realtor Fee Calculator
Calculate realtor commission fees based on home sale price. See total commission, agent splits, and seller net proceeds. Supports custom commission rates.
IAAI Fee Calculator
Calculate IAAI (Insurance Auto Auctions) buyer fees including tiered buyer premiums, gate fees, and online bidding fees. See total purchase cost. Free calculator.
Lifestyle
Health, hobby, and everyday calculators
EV vs Gas Calculator
Enter your driving habits, gas price, and electricity rate, get a side-by-side annual cost comparison for EV vs gas vehicles with 5-year savings projection. Free tool.
Electricity Cost Calculator
Enter wattage and usage hours, get daily, monthly & yearly electricity costs instantly. Includes AC, heater, PC & fridge presets. Free, no signup required.