Toolbench Calculators
Everyday calculators that run in your browser — no signup, nothing uploaded.
Percentage calculatorof, change, reverse
Tip calculatortip and split
Age calculatoryears months days
Time duration calculatorhh:mm:ss add
Unit converterlength mass temp
Discount & markupprice math
BMI calculatormetric or imperial
Date differencedays between dates
Hours & minutesadd hh:mm
Split billequal or shares
Simple loan paymentestimate only
Area & volume converterm², L, gallons
How these work
Every calculator is a static HTML page with client-side JavaScript. Inputs never leave your device, there are no accounts, and pages stay fast and mobile-first.
Finance-adjacent tools (simple loan payment, discount) are plain arithmetic estimators — not tax, GST, EMI, or SIP engines, and not financial advice.
Toolbench tools · developer utilities live under /dev/.