Spreadsheet calculators and planning tools

Free calculators and planning helpers for founders and finance teams who live in Google Sheets and Excel. When you need full statements, jump to our templates.

Explore spreadsheet templates for full workbooks, or open the Lexicon for clear definitions of the terms behind the math.

Spreadsheet mathLive
Percentage calculator
Percent of a number, share as a percent, reverse the implied whole, and increase or decrease one value—plus copy-ready Sheets and Excel formulas.
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Spreadsheet mathLive
Compound interest calculator
Starting balance, monthly contributions, compounding, and nominal rate—ending balance, totals, and copy-ready FV formulas.
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PlanningLive
Time calculator
Duration between two date-times, shift a meeting by days or hours, and add or subtract clock-style durations—with Sheets and Excel patterns.
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PlanningLive
Amortization schedule calculator
Fixed-rate loan: monthly payment, principal and interest over time, full schedule—with PMT, PPMT, and IPMT for Sheets and Excel.
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PlanningLive
Currency converter
Convert amounts with ECB-oriented reference rates, optional historical table date, inverse rate, and spreadsheet tips for Sheets and Excel—not a bank trading quote.
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