Free Savings Calculator
Five savings tools in one: monthly savings goal, savings goal planner, deposit growth with compound interest, fuel savings calculator, and SEER energy savings. Every savings calculation covered.
How much do you need to save each month to reach your goal?
Was this helpful?
How long will it take to reach your savings goal with a fixed monthly deposit?
Was this helpful?
How much will your savings grow with regular monthly deposits and compound interest?
Was this helpful?
Compare fuel costs between two vehicles or driving scenarios. Calculate annual and lifetime savings.
Was this helpful?
Calculate energy cost savings from upgrading your HVAC system to a higher SEER rating. Find your payback period.
Was this helpful?
📚 Sources & Methodology
All calculations use verified government and financial standards:
- FDIC Interest Rate Guidance 2026 — compound interest formulas, savings account APY standards
- U.S. Department of Energy — Energy Star 2026 — SEER efficiency formula: kWh = (BTU/hr × hours) / (SEER × 1000)
- EPA fueleconomy.gov 2026 — MPG fuel cost formula and average fuel prices
- Federal Reserve — Personal Savings Rate Data — benchmarks for savings rate recommendations
- IRS Publication 590-B — tax-advantaged savings account limits referenced in FAQs
Complete Savings Calculator Guide — Goals, Deposits, Fuel & Energy
Monthly Savings Goal Calculator — How Much to Save Each Month
The monthly savings goal calculator answers the most common savings question: given a target amount and a deadline, how much must you set aside each month? The formula accounts for compound interest — money deposited early earns more than money deposited later, so the required monthly deposit is less than a simple division suggests.
Monthly deposit = Goal / [((1 + r)^n - 1) / r]
Where: r = monthly rate (APY/12), n = months
Example: $10,000 in 24 months at 4% APY
r = 0.04/12 = 0.00333
Monthly = $10,000 / (((1.00333^24)-1)/0.00333) = $401.49
High-yield savings accounts (HYSA) at online banks currently offer 4-5% APY. At traditional banks the rate is often 0.01-0.5%. The difference is significant over longer timeframes: saving $500/month at 5% APY for 3 years results in $19,728 — compared to $18,000 with no interest. Always factor APY into your savings plan.
Savings Goal Planner — How Long to Reach Your Target
The savings goal planner calculates the reverse: given your monthly deposit and interest rate, how many months until you reach a specific goal? This is useful when you have a fixed savings capacity and want to know the realistic timeline for a down payment, emergency fund, or large purchase.
Months = log(1 + (Goal × r) / PMT) / log(1 + r)
Where: r = monthly rate, PMT = monthly deposit, Goal = target minus current savings
Example: $20,000 goal, $400/month, 4.5% APY
r = 0.045/12 = 0.00375
Months = log(1 + (20000 × 0.00375)/400) / log(1.00375) = 44.7 months
Deposit Growth Calculator — Compound Savings with Regular Contributions
The deposit growth calculator projects how a combination of an initial lump sum and regular monthly deposits grows over time with compound interest. This is the foundation of any long-term savings strategy — understanding the future value of consistent deposits is essential for retirement planning, college savings, and wealth building.
Fuel Savings Calculator — Compare MPG and Annual Cost
The fuel savings calculator compares the annual and lifetime fuel costs between two vehicles or driving scenarios. It uses the EPA fuel cost formula: annual fuel cost = (miles driven / MPG) × fuel price. The savings is the difference between the two scenarios. This is the correct method to evaluate whether a more fuel-efficient vehicle justifies its higher purchase price.
| Current MPG | New MPG | Annual Miles | @ $3.50/gal | Annual Savings | 5-Year Savings |
|---|---|---|---|---|---|
| 20 MPG | 30 MPG | 12,000 | $600 → $400 | $200 | $1,000 |
| 20 MPG | 40 MPG | 12,000 | $600 → $300 | $300/yr | $1,500 |
| 15 MPG | 30 MPG | 15,000 | $1,167 → $583 | $583/yr | $2,917 |
| 25 MPG | 50 MPG (hybrid) | 12,000 | $480 → $240 | $240/yr | $1,200 |
SEER Energy Savings Calculator — HVAC Upgrade Payback Period
SEER (Seasonal Energy Efficiency Ratio) measures how efficiently an air conditioner converts electricity into cooling. The higher the SEER, the less electricity used per BTU of cooling. The DOE formula for annual energy consumption: kWh = (BTU/hr × hours) / (SEER × 1,000). Savings = energy difference × electricity rate.
Annual kWh (old) = (BTU × hours) / (SEER_old × 1000)
Annual kWh (new) = (BTU × hours) / (SEER_new × 1000)
Annual savings ($) = (kWh_old - kWh_new) × electricity_rate
Payback (years) = upgrade_cost / annual_savings
Example: SEER 10→20, 3-ton (36,000 BTU), 1,000 hrs, $0.13/kWh
Old: 3,600 kWh | New: 1,800 kWh | Savings: 1,800 × $0.13 = $234/yr
Federal minimum SEER standards: SEER 14 in northern states and SEER 15 in southern states (as of January 2023, per DOE ruling). SEER2 ratings (the new test standard) are approximately 5% lower than SEER ratings — so SEER2 14.3 = approximately SEER 15. When comparing units, ensure you compare the same rating standard.
Savings Rate Benchmarks — How Much Should You Save?
| Goal | Recommended Rate | Notes |
|---|---|---|
| Emergency fund only | 5-10% of income | 3-6 months expenses as target |
| Retirement (start at 25) | 15% of gross income | Fidelity / Vanguard standard |
| Retirement (start at 35) | 20-25% of gross income | Later start requires higher rate |
| Financial independence (FIRE) | 40-70% of income | Retire in 10-20 years |
| Large purchase in 2-5 years | Goal ÷ months | Use monthly goal calculator above |