Free Online Calculators

Finance, FIRE planning, real estate, health, education, and everyday math. No signup. No tracking. Just tools that work.

Education Calculators

See which AP scores qualify for college credit and how much tuition you save

Calculate your IB Diploma score with TOK, Extended Essay, and failing condition checks

Calculate your semester GPA and update your cumulative GPA in seconds

Estimate your federal tax on Social Security, pension, IRA withdrawals, and dividends

See how much employer match you're capturing, what you're leaving on the table, and the long-term cost of uncaptured free money

See how much interest you save and how many years you cut by paying every two weeks

Find your Barista FIRE number and timeline — combining part-time income with portfolio withdrawals to semi-retire years earlier

Find your available contribution space and see how tax-free growth stacks up against a taxable account

Model pension, Social Security, and portfolio withdrawals year by year

Find your 5 training zones using max HR or the Karvonen method with resting heart rate

Find your daily water intake based on weight, activity level, and climate

Calculate pace, finish time, or distance — plus race time predictions for 5K to marathon

Paste JSON, get a CSV file — handles arrays, nested objects, and missing keys instantly

Paste your text to get reading time, word count, and speaking time instantly

Find how many words fit on a page — or how many pages your word count fills

Estimate monthly cash flow, cash-on-cash return, and break-even occupancy for a short-term rental property

Average buyer closing costs for all 50 states — with a free itemized calculator

Calculate your rental property's DSCR and see if it qualifies for a DSCR loan