Free online tools.
Free calculators for weather, home and DIY projects, Roblox Grow a Garden, and marketplace seller fees, pricing and profit decisions.
Available tools and categories
Home & DIY Calculators
Plan picture spacing, wall layouts, fabric, fence posts and drainage gravel.
Snow Day Calculator
Check a weather-based snow day estimate from a ZIP or postal code.
Roblox Grow a Garden Calculator
Estimate crop value from weight, mutations, boosts and quantity.
Etsy Seller Tools
Plan seller fees, pricing, profit targets and advertising costs.
Amazon Seller Tools
Estimate FBA profit, inbound placement and low-inventory fees.
eBay Seller Tools
Check selling fees, Best Offer prices and advertising break-even rates.
Mercari Fee & Profit Calculator
Calculate US seller fees, payout, profit and a break-even price.
Depop Boosted Listing Profit Calculator
Compare boosted and unboosted profit for US, UK and Australia sales.
