About CalcTrail

CalcTrail is a free set of calculators and converters for finance, health, engineering, AI costs, marketing, design, grades, dates and times, and everyday math. Work in tabs, organize them into workspaces, keep a searchable history, reuse your own variables, carry a result into the next calculator, share it with a link, and export it as JSON, CSV or PDF. Calculations run in your browser; sign in only if you want your work to sync across devices.

Data Saving: When logged in, your workspaces, history, variables, and settings are saved to your account and available on any device. As a guest, the same data stays in your browser; it reaches us only if you sign in, or as a single tab when you create an expiring share link. Every export format works without an account — an account only adds the complete multi-row schedules and comparison tables.

Flexible Sign-In: Create an account with email and password, or sign in quickly with Google. Google sign-in includes automatic email verification, and you can set a password later if you prefer.

Tool-specific features: tape mode on the Basic calculator, refinance break-even on the mortgage and loan calculators, investment and portfolio comparisons, macro nutrition charts, calorie cycling, multi-unit conversion, a time zone planner for several places, business-days calculations, and related calculators on every calculator page. Exports: JSON, CSV and PDF on every calculator, for everyone; signing in adds the full multi-row tables.

Plan Limits: Free plan includes 10 workspaces, 20 tabs per workspace, 100 history entries per workspace, and 100 global variables. Guest users have 5 workspaces, 10 tabs per workspace, 50 history entries per workspace, and 25 variables. Every tool works on both, and every export format is open to guests; an account adds cross-device sync, the complete multi-row export tables, and CSV import for custom variables.

• Calculators & converters: finance, health, engineering, AI costs, marketing, design, grades, dates and times, and everyday math.
• Multi-tab interface: open several tools at once, each with its own inputs and undo/redo history.
• Global Search: press Ctrl or ⌘ + K and type a tool name, a word from a saved entry, or > for commands.
• Data Saving: Signed in, your data is saved to your account and available on any device. As a guest it stays in your browser (an expiring share link sends just that tab), and every export format still works — an account adds cross-device sync and the complete multi-row export tables.
• Workspaces: Keep each project in its own workspace, with its own tabs and history.
• History: Save calculations, add tags for filtering, restore any entry, and export a workspace's history as JSON.
• Custom Variables: Save a value you reuse (e.g., tax_rate) and insert it into a field from the variable icon at its right end, in any workspace.
• Dashboard: once you have used four tools, the ones you use most show first.
• Backup: download a file of your workspaces, tabs, history, variables and settings, and restore it later from Settings.
• Appearance Settings: Customize your experience with light/dark modes, font sizes, and a compact layout.
• Keyboard shortcuts: for search, saving, undo and redo, and switching tabs; press ? for the full list.
• Accessibility: Labelled controls for screen readers and colour contrast checked against the WCAG AA minimum.
• Privacy: as a guest, your data is stored in the browser and an expiring share link is the only thing that sends a snapshot to us. Signed-in user data is stored on our servers (encrypted in transit via HTTPS) for cross-device sync.
• Guided Help: worked examples you can load in one click, and a Quick Start guide on every calculator page.
• Specialized modes: mortgage refinance break-even, multi-loan comparison, investment scenarios, portfolio comparison, macro charts, time-card totals from clock-in and clock-out times, and a scientific calculator with factorial, hyperbolic functions, a constants library, and Fixed, Scientific or Engineering display.
• Export & import: every calculator exports JSON, CSV or PDF, for everyone; signing in adds the complete multi-row tables. Custom variables can be imported from CSV with a free account.
• Related calculators: every calculator links to related ones at the bottom of the page, and some can send your numbers straight into the next.

CalcTrail exists so you don't have to juggle several different sites and a spreadsheet to work through one financial or engineering decision. It's a single library of calculators and converters with tabs, history, and reusable variables, built for students, professionals, and anyone who works with numbers regularly.

Every calculator that works from a formula shows it, not just a result, so you can check the math instead of trusting a black box. Accessibility and performance get the same attention as new tools — controls are labelled for screen readers, colour contrast is checked against the WCAG AA minimum, and every public page has a JavaScript size budget so it stays fast on a laptop or a phone.

As a guest, your workspaces, history, variables, and settings are stored in your browser and are not sent to our servers unless you sign in; creating an expiring share link sends that one snapshot to us so the link can work. Signed-in user data is stored on our servers so it syncs across devices. Connections are encrypted (HTTPS). See the Privacy Policy and Terms of Service below for full details.

Questions, bug reports, or a tool you would like us to add? Email us — we read everything that comes in.