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JisuanmacOS · Google Chrome

Jisuan — Calculate right where you type.

Calculate amounts, tax, dates and ratios in Chrome input fields.

Download Jisuan

See how it works
  • Lightweight
  • On-device
  • Private
A. Free core calculationsAlways-free essentials
Free
#ScenarioTest inputWrite-back value
F01Addition & grouping=12580+369016,270
F03Multiplication=100*909,000
F0610k unit=3.6w+850044,500
F10Date across month2026-09-15 + 45d2026-10-30
B. Pro finance calculationsProfessional finance expressions
Pro
#ScenarioTest inputWrite-back value
P01Net from gross108000 incl. 13% tax95,575.22
P04Add tax to net100k net + 13%113,000.00
P06Year-over-year growthThis year 1.26m / last 1.05m20.00%
P07Completion rateTarget 1.2m, completed 930k77.50%
Jisuan candidate panel showing a tax split and confirmed write-back into the current field
  1. 1Type an expression in a web field
  2. 2Press ⌘⌥=
  3. 3Choose a result and write it back

Use cases

Supportedweb input scenarios

Jisuan calculates beside the active HTML field.A confirmed candidate returns to that same field.

No separate calculator and no tab switching.Password, read-only and secure inputs are refused.

Split gross and net

Enter an amount and tax rate in a web form.

108000 incl. 13% tax
Net95,575.22

Completion rate

Calculate progress while completing a web form.

Target 1.2m, completed 930k
77.50%

Runs locally

Expressions stay on your Mac

Decimal precision

Precision for financial numbers

Confirm before writing

Write back only after selection