Free tools
Use the calculators free
No signup, no email, no paywall. Each tool is a working version of the full Blacknave product — sign up if you want to save your inputs and history.
TDEE Calculator (Mifflin-St Jeor + activity multiplier)
Calculate your total daily energy expenditure and macro split in 30 seconds.
Use it free →
Macro Calculator (protein, carbs, fat from your TDEE)
Get protein, carb, and fat targets matched to your calorie goal — and split across meals.
Use it free →
FIRE Calculator (Financial Independence, Retire Early)
Calculate your FIRE number, savings rate, and projected retirement age.
Use it free →
Debt Payoff Calculator (avalanche vs snowball)
See your debt-free date and total interest paid for both repayment methods.
Use it free →