Simple, private calculators for work and money

Fast, accurate, and quiet. No sign-up walls, no pop-ups, and nothing you enter ever leaves your browser.

Time Card Calculator

Total your weekly hours from clock-in/clock-out times, with breaks, overtime, and gross pay. Printable.

Overtime Pay Calculator

Time-and-a-half and double-time rates, and what overtime really adds per week, month, and year.

Hourly to Salary Calculator

Convert a wage to annual, monthly, and biweekly pay — or a salary back to its hourly rate.

Mortgage Payoff Calculator

What an extra payment saves in interest and years, with your new payoff date charted.

Coast FIRE Calculator

The number that lets your portfolio finish the retirement job on its own — and when you'll hit it.

Why these calculators?

Most calculator sites answer a thirty-second question with three pop-ups, a newsletter modal, and a page that jumps around while ads load. These don't. Each tool here is built to be the fastest, clearest version of itself:

Private by architecture. Every calculation runs in your browser. Your wages, hours, and savings are never uploaded, logged, or stored on a server.
Works everywhere. Phone-friendly, keyboard-friendly, printable, fine in dark mode — and in your currency (USD, EUR, GBP, CAD, AUD, INR).
Shows its work. Every calculator explains its formula and assumptions, so you can check the math yourself.

More calculators are coming

This site is a workshop, not a warehouse — tools get added when they can be genuinely better than what's already out there. Next on the bench: an inflation calculator and a take-home pay estimator. Have a request? Tell us.