Four small calculators that answer the questions that come up right before checkout. Nothing is saved or sent anywhere.
Spread a total budget across several items.
Check whether a sale price is actually worth it.
out of 100 · 30% off list
Strong deal — matrix-approved
Know your exact return deadline.
See when your manufacturer warranty runs out.
Built for checkout moments
No account needed
Every tool runs locally in your browser tab.
Nothing is stored
Numbers you enter never leave your device.
Reusable anytime
Bookmark this page for your next purchase.
Get notified the moment we ship a new calculator or matrix update.