Focused calculation library
Specialized Business Calculators
Research-backed tools for payment fees, marketplace selling, marketing efficiency, pricing, freelance work, and business finance.
18 focused toolsFreeNo signupReviewed September 8, 2026
Ecommerce
Ecommerce calculators
Stripe Fee CalculatorEstimate Stripe processing fees, net payment proceeds, and effective processing rate using your current account terms.→Etsy Fee CalculatorEstimate Etsy selling fees, order proceeds, and contribution after product and fulfillment cost.→Square Fee CalculatorEstimate Square processing fees and net proceeds with editable rates for the applicable payment channel.→TikTok Shop Fee CalculatorModel TikTok Shop marketplace, affiliate, promotional, fulfillment, and product costs per order.→Shopify Fee CalculatorEstimate Shopify order proceeds after payment, transaction, app, fulfillment, and product costs.→eBay Seller Fee CalculatorEstimate eBay marketplace deductions, net proceeds, and contribution after direct product and fulfillment costs.→
Employment
Employment calculators
Overtime CalculatorEstimate regular earnings, overtime earnings, and total gross pay with an editable overtime multiplier.→Sales Commission CalculatorEstimate sales commission and total gross earnings from eligible sales, commission rate, base pay, and adjustments.→Billable Hours CalculatorEstimate annual billable capacity and utilization after nonbillable working time.→Consulting Rate CalculatorEstimate a sustainable hourly and day rate from compensation goals, business expense, reserve, and billable capacity.→
Finance
Finance calculators
Reverse Sales Tax CalculatorSeparate the pre-tax price and included sales tax from a tax-inclusive total.→Invoice Factoring CalculatorEstimate the initial advance, factoring fee, reserve, and total cash received for an invoice.→Line of Credit CalculatorEstimate simple interest and total borrowing cost for a revolving credit balance and time outstanding.→Working Capital CalculatorCalculate net working capital and current ratio from current assets and current liabilities.→
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