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TallyBench / Finance Calculator
// FINANCE CALCULATOR

Solve any Time-Value-of-Money variable from the other four.

Pick which variable to solve for — N, I/Y, PV, PMT, or FV — then fill in the remaining four. This uses the standard ordinary-annuity TVM equation behind every financial calculator's TVM keys.

General-purpose solver. PV and PMT are entered as positive amounts (money you put in); the tool computes the resulting FV the same way. This models an ordinary annuity — payments at the end of each period.
Future Value (FV)$0

What is the Time Value of Money?

The Time Value of Money (TVM) is the principle that a dollar today is worth more than a dollar in the future, because today's dollar can be invested and earn a return in the meantime. Every loan payment, investment projection, and savings-goal calculation on this site rests on this same idea — this tool exposes the underlying equation directly so you can solve for any one of its five variables instead of just one fixed output.

What do PV, FV, PMT, N, and I/Y mean?

PV is present value — a lump sum you have today. FV is future value — what that lump sum (plus any payments) grows to. PMT is a recurring payment or contribution made each period. N is the number of periods. I/Y is the interest rate earned per period, entered as a percentage. Together, these five describe any stream made up of a starting lump sum plus equal periodic contributions growing at a fixed rate per period.

When would I solve for each variable?

Solve for FV to project how a lump sum plus regular contributions will grow by a target date. Solve for PV to find what a future goal is worth in today's dollars. Solve for PMT to find the contribution needed each period to hit a target. Solve for N to find how many periods it takes to reach a goal. Solve for I/Y to back out what rate of return a known investment history actually implies.

How is this different from your other investment calculators?

This is a general-purpose TVM solver that computes any one of the five variables from the other four, the same way the TVM keys on a financial calculator work. For a purpose-built tool focused on lump-sum growth over time, see the Compound Interest Calculator; for a friendlier layout built specifically around regular contributions, see the Investment Calculator.

Worked example — solving for FV: N = 10 periods, I/Y = 6% per period, PV = $1,000, PMT = $100 per period. FV = 1,000 × (1.06)10 + 100 × ((1.06)10 − 1) ÷ 0.06 = 1,790.85 + 1,318.08 = $3,108.93. Feeding that same $3,108.93 back in as FV and solving for I/Y instead returns 6.00%, confirming the equation is being solved consistently in both directions.