Free tools
Calculators for budgets, savings, loans, debt payoff, trading risk and blood sugar units. They run entirely in your browser: nothing you type is sent anywhere, and there is nothing to sign up for.
Personal Finance
Daily spending calculator
Shows how much money is genuinely free to spend each day until your next payday, after the bills still to come and the savings you want to keep.
Free · private · no sign-up50/30/20 budget calculator
Splits your monthly take-home pay into the three parts of the 50/30/20 rule: needs, wants, and savings plus extra debt payments.
Free · private · no sign-upSavings goal calculator
Tells you how much to put aside each month to reach a savings target in a set number of months, counting what you have already saved and any interest.
Free · private · no sign-upLoan payment calculator
Calculates the fixed monthly payment on a loan, how much you will repay in total and how much of that is interest.
Free · private · no sign-upDebt payoff calculator: snowball vs avalanche
Compares the two most popular ways to pay off several debts, snowball (smallest balance first) and avalanche (highest interest rate first), using your real balances, rates and payments.
Free · private · no sign-upCompound interest calculator
Shows how a starting amount plus a regular monthly deposit grows over the years when interest is added monthly and itself earns interest.
Free · private · no sign-upHealth & Wellness
Trading & Investing Education
Position size calculator (forex)
Works out how many lots to trade so that, if your stop-loss is hit, you lose only the percentage of your account you chose to risk.
Free · private · no sign-upRisk/reward calculator
Shows how much you stand to gain for each unit you risk, and the share of trades you would need to win just to break even at that ratio.
Free · private · no sign-up