Enter your revenue and your cost of sales to see your gross profit, your gross profit margin as a percentage, and your markup on cost.
Direct costs only: materials, goods bought for resale, direct labour, delivery of goods to customers. Rent, salaries of office staff, utilities and marketing are fixed costs and belong in the profit and break-even calculator instead.
No, and mixing them up is a common cause of underpricing. Margin is profit as a share of the selling price. Markup is profit as a share of cost. A 50% markup is only a 33.3% margin.
It depends entirely on the sector. A distributor working on volume may run a single-digit margin, while a service business can run far higher. The useful comparison is your own margin over time, and against businesses doing the same thing.
Work with figures excluding sales tax. Sales tax collected is not your revenue, and including it will overstate both revenue and margin.