If most of your work comes through Upwork, using their calculator keeps you inside a tool tuned to that platform's fee structure — Upwork takes a service fee from freelancer earnings, and pricing with that in mind from the start avoids an unpleasant surprise on your first payout.
If you freelance across multiple channels — direct clients, other platforms, referrals — a platform-neutral calculator is a more honest fit. SMBkits' freelance rate calculator works from your income goal, expenses, and realistic billable hours to back into an hourly rate, without assuming any specific platform's fees are part of the math.
The billable-hours input is where most people get the number wrong. It's tempting to divide a target income by 40 hours a week, but very few freelancers actually bill 40 hours — admin, proposals, unpaid pitching, and gaps between projects all eat into the week. Using a realistic billable-hours estimate (often 20-30 hours) instead of a full workweek is what keeps the resulting rate from quietly underfunding your actual income goal.
Either calculator gets you a workable number. The real decision is whether you want a rate baked around one platform's fee structure, or a platform-neutral rate you adjust downward when a specific platform takes its cut.