Calculator for Founder
13 calculator tools hand-picked for Founder.
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Break-Even Calculator
How many units must you sell to stop losing money? Enter fixed costs, price, and variable cost per unit for break-even units, break-even revenue, and contribution margin — browser-only
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Commission Calculator
Work out sales commission three ways — flat rate, progressive tiers, or reverse-solve the sales you need to hit an income target. Browser-only, shareable.
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Date Difference Calculator
Days / weeks / months / years between two dates — plus business-days mode — browser-only
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Freelance Hourly Rate Calculator
Back into the hourly rate you must charge from your target salary, business expenses, billable hours, profit margin, and taxes — browser-only
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LLM Pricing Calculator
Estimate daily and monthly LLM spend from tokens, request volume, and editable model prices.
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Markup & Margin Calculator
Cost ⇄ price ⇄ markup % ⇄ margin % — solve any two, see both rates side by side — 100% in your browser
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Percentage Calculator
5 common percentage calculations — "x% of y", "x is what% of y", percentage change, increase/decrease — instant, browser-only
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Random Number Generator
Generate cryptographically-secure random integers — single or batch, with/without duplicates — browser-only
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Rent vs Buy Calculator
See whether buying beats renting and investing the difference — net cost, terminal equity, and the break-even year, all in your browser
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Sales Tax Calculator
Add or remove US sales tax — split state + local rates, real 2024 state base rates on tap, browser-only
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Startup Runway Calculator
Cash in bank ÷ burn rate = months left. Enter balance, monthly spend, and revenue (with optional growth) for runway, cash-out date, and the date you must start fundraising — browser-only
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Timezone Converter
Convert any time between any two timezones — DST-aware, IANA database — browser-only
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Unit Converter
Convert between length, weight, temperature, area, volume, speed, time — instant, browser-only