Tool directory

All tools

Browse every SolveKit utility. Each tool solves one real problem quickly, clearly, and without requiring an account.

Estimate survey sample size from confidence level, margin of error, and population.

Add or remove value-added tax and show the net and tax amounts.

Compare package prices using a normalized cost per unit.

Calculate compound annual growth rate between a starting and final value.

Estimate future purchasing cost from an annual inflation rate.

Estimate payment processing fees and the amount received.

Estimate card processing fees or the amount to charge for a target payout.

Estimate marketplace fees, payment cost, and profit on a sale.

Estimate listing, transaction, payment, and advertising fees.

Estimate shipping cost from base price, weight, distance, and surcharges.

Calculate selling price, markup, and margin from product cost.

Calculate CPC, clicks, spend, conversion rate, and cost per acquisition.

Estimate customer value from order size, frequency, margin, and retention.