Launched this week
MasterTool
2,613 free calculators that run privately in your browser
2 followers
2,613 free calculators that run privately in your browser
2 followers
MasterTool is a library of 2,613 free online calculators and converters — seller fees for 23 platforms, mortgage and 2026 income-tax calculators, landscaping material estimators, unit converters, and more. Every calculation runs 100% client-side in your browser: no sign-up, no server receives your inputs. Every calculator can also be embedded into any blog or page with one iframe.
