Target Lump Sum Calculator Use this calculator to estimate the amount you have to invest to achieve a certain lump sum target at a given time in the future. The calculator shows the lump sum or monthly options. Target Lump Sum (£): * Annual Growth/Interest (%): * Enter 6% as 6. Term of investment (full years): * Calculator Notes: This calculator assumes that charges are as per L&G 100 Index Fund. Your actual charges may be higher or lower. The calculator assumes that the 4, 6, 8 per cent growth rates rules apply. The value of investments can fall as well as rise and you may not get back the amount you originally invested. Past performance is not a guide to future performance.