Calculators for people who build and run software
Free, fast, no sign-up. Each tool answers one question and shows its working. Nothing you type leaves your browser.
SaaS Metrics Calculator
MRR, ARR, NRR/GRR, churn, ARPA, LTV, CAC, LTV:CAC, CAC payback and Quick Ratio from one screen of inputs.
FreelanceFreelance Hourly Rate Calculator
Turn a target take-home income into the hourly rate you need to charge — after unpaid time, business expenses and taxes.
Personal FinanceSubscription Cost Calculator
List your recurring subscriptions and see what they really cost per month, per year, and over five years.
DevOpsUptime / SLA Calculator
Turn an SLA percentage like 99.9% into the exact downtime it allows per day, week, month and year — and work it backwards.
DevOpsCost of Downtime Calculator
Estimate what an outage costs in lost revenue, lost productivity and recovery — as a total and per minute of downtime.
Personal FinanceInflation Calculator
See what a US dollar amount from one year is worth in another, with cumulative and average annual inflation.
Personal FinanceSavings Goal Calculator
Work out how much to save each month to hit a goal by a date — or how long a fixed monthly amount will take.
FreelanceHourly to Salary Calculator
Convert an hourly rate to yearly, monthly and weekly pay, and back again — with your own hours and weeks.
Personal FinanceCompound Interest Calculator
Project savings or investments over time with a starting amount, regular contributions and compounding — with a year-by-year breakdown.
DevOpsLLM API Cost Calculator
Estimate what an LLM feature costs per request, per day and per month from token volume and per-model pricing.
More tools coming
This site is being built out one calculator at a time — freelance rate, cloud cost comparison, LLM API cost, crypto staking and others are on the way.