Startup finance calculators
Check how long your cash lasts, what a hire costs or why MRR changed. Each free calculator shows the formula behind its result, with inputs that stay in your browser. For an ongoing runway estimate, Plainhub recalculates from the income and costs you record.
Cash and runway
Cash runway calculator
How many months of cash you have left, and what actually changes it.
Burn rate calculator
Gross burn, net burn and the runway they imply.
Cash flow forecast
Twelve months of projected cash, and the month you run out.
Cash flow tracker
An itemized money in / money out ledger, and the balance it projects.
Cash reserve calculator
How many months of expenses to hold, and your gap to the target.
Late payment interest calculator
Estimate daily interest on an overdue invoice using the rate you enter.
Burn multiple calculator
What you burn per euro of new ARR, against the benchmark bands.
Revenue and customers
MRR calculator
Monthly recurring revenue, ARR and growth rate from your plans.
ARR calculator
MRR to ARR, plus net new ARR from the four movements.
Customer lifetime value calculator
Lifetime value, LTV:CAC ratio and CAC payback from churn and margin.
CAC calculator
Customer acquisition cost and CAC payback period from your spend.
Churn rate calculator
Customer churn and revenue churn side by side, annualized.
SaaS magic number calculator
What a euro of sales and marketing returns, against the bands.
Rule of 40 calculator
Growth plus margin against the 40 line, from your real numbers.
Hiring and costs
Break-even calculator
Break-even units and revenue, the formula worked through, margin of safety and runway.
Employee cost calculator
The true cost of a hire, and the months of runway it spends.
Payroll percentage calculator
Payroll as a share of revenue, or the budget a target share allows.
Pay yourself calculator
Estimate owner pay after setting aside cash for your chosen buffer.
One number, kept live
Every calculator here answers one question at one moment. Plainhub is a startup finance platform that keeps the core three live at once: type what happened and your runway, burn and MRR update together.