The Tape Calculator
Built for Real Work
87 specialized tools for amateur radio, finance, geometry, and more. See your work on a tape that never forgets.
One-time purchase. No subscriptions. No monthly fees. Own it forever.
Available on the App StoreMac · iPhone · iPad
Your calculator should remember what you did.
CalcLedger brings back the adding machine tape, redesigned for Mac, iPhone, and iPad. Every entry is visible, editable, and exportable as a professional PDF.
Every tool you need. One app.
From dipole antenna design to mortgage amortization, CalcLedger replaces a drawer full of specialized apps with one comprehensive toolkit.
See It in Action
CalcLedger is a Universal Purchase. One price unlocks the full app on iPhone, iPad, and Mac.
Multi-store jobs with separate subtotals and tax rates per location. Every line is editable, and totals recalculate instantly.
The Scratchpad with the standard Apple-style keypad. Toggle to Scientific or jump to any of the other 86 tools in one tap.
Tools, tapes, and all 87 calculators organized by category on the Home screen.
Sixteen antenna calculators with interactive 4-view diagrams. Built by a licensed ham, with formulas sourced from ARRL and N6LF.
US amateur band privileges by license class, plus on-air conventions. Sourced from FCC Part 97 and the ARRL US Amateur Radio Bands chart.
Sunrise, sunset, solar noon, and gray line windows for DX propagation, at any location worldwide.
Mortgage Payoff with after-tax Pay Down vs. Invest comparison. See whether extra payments really beat the market.
Two CDs side by side. Surfaces APY-versus-maturity divergence when terms or principals differ.
Scientific keypad with sin, cos, tan, log, ln, square root, and more, on the same live tape.
Date Difference and Date Calculator with dual calendar view. Includes a project-schedule mode for billing periods and event durations.
Multi-store jobs with separate subtotals and tax rates per location. Every line is editable, and totals recalculate instantly.
Two-column layout puts the calculator list and tape side by side. Tap any calculator in the sidebar to jump straight to it.
Sixteen antenna calculators with interactive 4-view diagrams. Built by a licensed ham, with formulas sourced from ARRL and N6LF.
US amateur band privileges by license class, plus on-air conventions. Sourced from FCC Part 97 and the ARRL US Amateur Radio Bands chart.
Sunrise, sunset, solar noon, and gray line windows for DX propagation, at any location worldwide.
Mortgage Payoff with after-tax Pay Down vs. Invest comparison. See whether extra payments really beat the market.
Two CDs side by side. Surfaces APY-versus-maturity divergence when terms or principals differ.
Scientific keypad with sin, cos, tan, log, ln, square root, and more, on the same live tape.
Date Difference and Date Calculator with dual calendar view. Includes a project-schedule mode for billing periods and event durations.
Nine-chapter help manual built directly into the app. Fully searchable. No internet required.
Tape, calculator list, and totals pane all visible at once on Mac. The keypad stays ready for the next line.
Two Scratchpads side by side: Standard for everyday math, Scientific for trig and logs. Both run on the same live tape model.
Sixteen antenna calculators with interactive 4-view diagrams. Built by a licensed ham, with formulas sourced from ARRL and N6LF.
US amateur band privileges by license class, plus on-air conventions. Sourced from FCC Part 97 and the ARRL US Amateur Radio Bands chart.
Sunrise, sunset, solar noon, and gray line windows for DX propagation, at any location worldwide.
Mortgage Payoff with after-tax Pay Down vs. Invest comparison. See whether extra payments really beat the market.
Two CDs side by side. Surfaces APY-versus-maturity divergence when terms or principals differ.
Plan your field operation: real radio manufacturer presets, TX and RX current, duty cycle, battery chemistry, and estimated runtime.
Find your Maidenhead grid from GPS, or decode any grid into coordinates. Supports 4, 6, 8, and 10 character precision.
Date Difference and Date Calculator with dual calendar view. Includes a project-schedule mode for billing periods and event durations.
A professional workshop. Not a scratch pad.
Not another calculator app. A professional workshop built on a foundation your existing apps do not have.
Buy once. Own forever.
No subscription. No monthly fee. No in-app purchases. CalcLedger is a one-time Universal Purchase, fully unlocked on every platform you own.
One-time purchase. No subscription required. Yours forever on all your Apple devices.
CalcLedger is here.
Built by a ham operator for the communities that need it. One-time purchase. No subscriptions, ever.
Download on the App Store